Biology Semester Exam Quiz 1
First semester Biology exam review questions.
Questions and Answers
- 1.
Which of the following is an example of a nonliving thing?
- A.
Leaves
- B.
Water
- C.
Bacteria
- D.
Plant cell
Correct Answer
B. WaterExplanation
Water is an example of a nonliving thing because it does not possess characteristics of living organisms. It lacks cells, cannot reproduce, grow, or respond to stimuli. Water is a chemical compound composed of hydrogen and oxygen molecules and is essential for life, but it is not considered a living entity itself.Rate this question:
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- 2.
Which of the following is not a characteristic of living things?
- A.
DNA
- B.
Respond to stimulus
- C.
Photosynthesis
- D.
Reproduce
Correct Answer
C. PhotosynthesisExplanation
Photosynthesis is not a characteristic of living things because it is a specific process carried out by plants and some microorganisms to convert sunlight into energy. While all living things require energy, not all living things perform photosynthesis. DNA, responding to stimuli, and reproduction are all characteristics commonly associated with living organisms.Rate this question:
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- 3.
< Carbon Atom. How many electrons fit into the second shell of a carbon atom?
- A.
2
- B.
8
- C.
6
- D.
4
Correct Answer
C. 6Explanation
The second shell of a carbon atom can hold a maximum of 8 electrons. However, since carbon has 6 electrons in total, it can only fill up to 6 electrons in its second shell. Therefore, the correct answer is 6.Rate this question:
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- 4.
A carbohydrate is used to...
- A.
Provide energy and help structrually
- B.
Store and transmit genetic information
- C.
Convert amino acids into protein
- D.
Break down glucose
Correct Answer
A. Provide energy and help structruallyExplanation
Carbohydrates are a major source of energy for the body. They are broken down into glucose, which is used by cells to produce ATP, the main energy currency of the body. Additionally, carbohydrates also play a structural role in the body, as they are a component of cell membranes and connective tissues. Therefore, carbohydrates provide energy and help structurally in the body.Rate this question:
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- 5.
Which of the following is an example of an abiotic factor?
- A.
Bacteria
- B.
Trees
- C.
Sunlight
- D.
Animals
Correct Answer
C. SunlightExplanation
Sunlight is an example of an abiotic factor because it is a non-living component of the environment. Abiotic factors are physical or chemical factors that affect the living organisms in an ecosystem. Sunlight is crucial for photosynthesis, a process by which plants convert sunlight into energy. It also affects temperature, which in turn influences the behavior and distribution of organisms. Bacteria, trees, and animals are all living organisms and therefore considered biotic factors.Rate this question:
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- 6.
A group of individuals that belong to the same species and live in the same area, is the definition of which ecological term?
- A.
Community
- B.
Species
- C.
Ecosystem
- D.
None of the above
Correct Answer
D. None of the aboveExplanation
The correct answer is "none of the above" because the given definition describes a population, not a community, species, or ecosystem. A community refers to the interactions between different populations in an area, while a species refers to a group of organisms that can interbreed and produce fertile offspring. An ecosystem includes both living organisms and their physical environment.Rate this question:
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- 7.
Which type of consumer must aquire energy from other organisms by ingesting them in some way?
- A.
Heterotrophs
- B.
Herbivore
- C.
Decomposer
- D.
Parasite
Correct Answer
A. HeterotrophsExplanation
Heterotrophs are organisms that cannot produce their own energy and must obtain it from other organisms. They acquire energy by ingesting other organisms, either by consuming plants (herbivores) or other animals (carnivores). Decomposers, on the other hand, obtain energy by breaking down dead organic matter, while parasites obtain energy by living off and feeding on a host organism. Therefore, the correct answer is heterotrophs.Rate this question:
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- 8.
Another word for a step in a food chain or web is...
- A.
Food chain
- B.
Topic level
- C.
Primary producer
- D.
Biosphere
Correct Answer
B. Topic levelExplanation
A "step" in a food chain or web refers to a specific level or position within the chain or web where energy and nutrients are transferred from one organism to another. This level can also be referred to as the "topic level" as it represents a distinct topic or focus within the larger context of the food chain or web. The other options, such as "food chain," "primary producer," and "biosphere," do not accurately describe a step within the food chain or web.Rate this question:
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- 9.
Which of the following is not a cycle of matter?
- A.
Recycling in the biosphere
- B.
Nitrogen cycle
- C.
Carbon cycle
- D.
Chemosynthesis
Correct Answer
D. ChemosynthesisExplanation
Chemosynthesis is not a cycle of matter because it is a process by which organisms convert inorganic substances into organic compounds, typically using energy from chemical reactions. It does not involve the cycling or transformation of specific elements or compounds, like the other options (recycling in the biosphere, nitrogen cycle, and carbon cycle) do.Rate this question:
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- 10.
Which three gases are responsible for the greenhouse effect?
- A.
Nitrogen, oxygen & water vapor
- B.
Methane, oxygen & carbon
- C.
Carbon dioxide, methane, & water vapor
- D.
Carbon dioxide, water vapor & nitrogen
Correct Answer
C. Carbon dioxide, methane, & water vaporExplanation
The greenhouse effect is a phenomenon where certain gases in the Earth's atmosphere trap heat from the sun, causing the planet to warm up. The three gases responsible for this effect are carbon dioxide, methane, and water vapor. Carbon dioxide is released through human activities like burning fossil fuels, methane is produced by livestock and other agricultural practices, and water vapor is naturally present in the atmosphere. These gases act as a blanket, preventing some of the heat from escaping into space and thus contributing to global warming.Rate this question:
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- 11.
A keystone species is...
- A.
The primary consumer
- B.
A carnivore
- C.
A single species in a community which has strong control over the structure of community
- D.
The most populated species in a community
Correct Answer
C. A single species in a community which has strong control over the structure of communityExplanation
A keystone species is a single species in a community that has a significant impact on the structure and functioning of the entire community. This species plays a crucial role in maintaining the balance and stability of the ecosystem. Its presence or absence can greatly influence the abundance and distribution of other species in the community. The removal of a keystone species can lead to a cascade of ecological effects, causing the collapse of the entire ecosystem. Therefore, keystone species are essential for the overall health and biodiversity of an ecosystem.Rate this question:
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- 12.
Which of the following is not a main factor of population size?
- A.
Emigration
- B.
Birth rate
- C.
Death rate
- D.
Immigration
- E.
None of the above
Correct Answer
E. None of the aboveExplanation
The given answer is "none of the above" because all the options listed (emigration, birth rate, death rate, immigration) are indeed main factors that can affect population size. Emigration refers to individuals leaving a population, while immigration refers to individuals entering a population. Birth rate and death rate are indicators of the number of births and deaths in a population, respectively. Therefore, all the options listed are main factors that can impact population size.Rate this question:
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- 13.
The term "carrying capacity" refers to:
- A.
The amount of electrons an atom can hold in any given shell
- B.
The maximum number of individuals of a particular species that can function in an enviroment
- C.
The situation in which each generation of off spring is larger than the generation before it
- D.
None of the above
Correct Answer
B. The maximum number of individuals of a particular species that can function in an enviromentExplanation
Carrying capacity refers to the maximum number of individuals of a particular species that can function in an environment. It represents the maximum population size that an environment can sustain over a long period of time, taking into account the available resources such as food, water, and habitat. When a population exceeds the carrying capacity, it can lead to resource depletion, competition, and ultimately population decline or collapse. Therefore, the correct answer is the maximum number of individuals of a particular species that can function in an environment.Rate this question:
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- 14.
Genetic mutations which make seperate different species is
- A.
Altered habitats
- B.
Smog
- C.
Ecological footprint
- D.
Biodiversity
Correct Answer
D. BiodiversityExplanation
Biodiversity refers to the variety of different species of plants, animals, and microorganisms in an ecosystem. Genetic mutations can lead to the development of new species, as they introduce changes in the genetic material of organisms. These mutations can result in the formation of distinct species that are genetically different from their ancestors. Therefore, the answer "biodiversity" is the most appropriate option as it directly relates to the process of genetic mutations leading to the creation of separate species.Rate this question:
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- 15.
Prokaryotes usually have
- A.
A nucleus
- B.
Specialized organelles
- C.
Genetic material
- D.
Many cells
Correct Answer
C. Genetic materialExplanation
Prokaryotes usually have genetic material. Unlike eukaryotes, prokaryotes lack a true nucleus and specialized organelles. However, they still possess genetic material in the form of DNA, which is typically found in a region called the nucleoid. This genetic material contains all the necessary instructions for the prokaryote's functioning and reproduction.Rate this question:
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- 16.
Which organelles are involved in energy conversion?
- A.
Mitochondria and chloroplasts
- B.
Mitochondria and ribosomes
- C.
Golgi apparatus and ribosome
- D.
Golgi apparatus and chloroplasts
Correct Answer
A. Mitochondria and chloroplastsExplanation
Mitochondria and chloroplasts are involved in energy conversion. Mitochondria are responsible for cellular respiration, which converts glucose into ATP, the energy currency of the cell. Chloroplasts, on the other hand, are found in plant cells and are involved in photosynthesis, where they convert sunlight into chemical energy in the form of glucose. Both organelles play crucial roles in energy conversion processes within cells.Rate this question:
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- 17.
Which organelle's function is to store materials like water, salts, proteins, and carbohydrates?
- A.
Vacuole
- B.
Centriole
- C.
Ribosome
- D.
Golgi apparatus
Correct Answer
A. VacuoleExplanation
The vacuole is an organelle that functions to store materials such as water, salts, proteins, and carbohydrates. It is a membrane-bound structure found in the cells of plants, fungi, and some protists. The vacuole plays a crucial role in regulating the cell's internal environment, maintaining turgor pressure, storing nutrients, and disposing of waste products. It is responsible for maintaining the overall balance and stability of the cell by storing and releasing various substances as needed.Rate this question:
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- 18.
In general, why do atoms of elements tend to form chemical bonds?
- A.
Atoms of elements do not form chemical bonds
- B.
To fill up their inner shell with electrons, in order to become stable
- C.
To fill up their valence shell with electrons, in order to become stable
- D.
None of the above
Correct Answer
C. To fill up their valence shell with electrons, in order to become stableExplanation
Atoms of elements tend to form chemical bonds to fill up their valence shell with electrons, in order to become stable. The valence shell is the outermost shell of an atom, and it determines the atom's reactivity and chemical behavior. By forming chemical bonds, atoms can share, gain, or lose electrons to achieve a full valence shell, which is usually eight electrons for most elements. This stability is achieved by following the octet rule, which states that atoms tend to gain, lose, or share electrons to obtain a configuration similar to the noble gases, which have a full valence shell.Rate this question:
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- 19.
Corn planted in a field that has been previously planted with legumes and then plowed under is likely to be
- A.
Less productive because legumes remove phosphorus from the soil
- B.
More productive because bacteria living on the roots of legumes fix nitrogen in the soil
- C.
More productive because nitrogen-fixing bacteria help to keep away pests
- D.
Less productive because the legumes have taken all the nitrogen and carbon from the soil
Correct Answer
B. More productive because bacteria living on the roots of legumes fix nitrogen in the soilExplanation
Legumes have a symbiotic relationship with nitrogen-fixing bacteria that live on their roots. These bacteria convert atmospheric nitrogen into a form that plants can use, which enriches the soil with nitrogen. When corn is planted in a field that has been previously planted with legumes and plowed under, the nitrogen-fixing bacteria remain in the soil and continue to provide nitrogen to the corn plants. This extra nitrogen availability enhances the growth and productivity of the corn, making it more productive compared to if the field had not been previously planted with legumes.Rate this question:
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- 20.
Suppose that a species of toads is introduced into a new enviroment in an attempt to reduce the population of insects. The toad has no natural predators in the new environment. The toad population would most likely
- A.
Increase exponentially
- B.
Increase logistically
- C.
Decrease rapildly and die out
- D.
Remain the same
Correct Answer
A. Increase exponentiallyExplanation
When a species is introduced into a new environment where it has no natural predators, it can lead to a rapid increase in population. This is because the absence of predators allows the toads to reproduce and thrive without any limitations. As the population grows, the availability of resources may become limited, but since the toads have no natural predators to control their numbers, they can continue to reproduce at a high rate. This leads to exponential growth, where the population size increases at an accelerating pace. Therefore, the most likely outcome in this scenario is that the toad population would increase exponentially.Rate this question:
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- 21.
What are the three stages of cellular respiration?
- A.
Photosynthesis, osmosis, Krebs cycle
- B.
Electron transport, photosystem I, photosynthesis
- C.
Glycolysis, Krebs cycle, electron transport
- D.
Glycolysis, osmosis, photosynthesis
Correct Answer
C. Glycolysis, Krebs cycle, electron transportExplanation
The correct answer is glycolysis, Krebs cycle, electron transport. Cellular respiration is the process by which cells convert glucose into usable energy. The first stage, glycolysis, takes place in the cytoplasm and breaks down glucose into pyruvate molecules. The second stage, the Krebs cycle, occurs in the mitochondria and further breaks down pyruvate into carbon dioxide, generating energy-rich molecules. The final stage, electron transport, also takes place in the mitochondria and uses the energy from the previous stages to produce ATP, the cell's main energy source.Rate this question:
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- 22.
Sea otters live in the ocean. Drought is NOT likely to be a limiting factor on the sea otter population.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Sea otters live in the ocean, where water is abundant. Drought, which refers to a prolonged period of low rainfall, is unlikely to affect the sea otter population as they do not rely on freshwater sources for survival. They primarily feed on marine organisms and are adapted to the oceanic environment. Therefore, it is reasonable to conclude that drought is not likely to be a limiting factor on the sea otter population.Rate this question:
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- 23.
Trees are renewable resources
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Trees are renewable resources because they can be replanted and grown again after they are cut down. This means that as long as proper management and sustainable practices are followed, the supply of trees can be replenished over time. Additionally, trees provide various benefits such as oxygen production, carbon sequestration, and habitat for wildlife. Therefore, it is important to protect and sustainably manage forests to ensure the continued availability of this valuable resource.Rate this question:
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- 24.
Introducing exotic species into new environments is a goal of biodiversity conservation.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Introducing exotic species into new environments is not a goal of biodiversity conservation. The introduction of exotic species can often have negative impacts on native species and ecosystems, such as competition for resources, predation, and the spread of diseases. Biodiversity conservation focuses on the protection and preservation of native species and their habitats, rather than introducing new species into unfamiliar environments.Rate this question:
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- 25.
Very few cells are able to reproduce.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement "Very few cells are able to reproduce" is incorrect. In reality, almost all cells in the human body have the ability to reproduce through a process called cell division. This allows cells to grow, repair damaged tissues, and replace old or dying cells. Therefore, the correct answer is False.Rate this question:
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- 26.
The primary function of the cell wall is to direct the activities of the cell.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The cell wall is a rigid structure that surrounds the cell membrane in plants, fungi, and bacteria. Its primary function is to provide structural support and protection to the cell. It helps maintain the shape of the cell and prevents it from bursting under osmotic pressure. The cell wall also acts as a barrier, regulating the movement of substances in and out of the cell. Therefore, the statement that the primary function of the cell wall is to direct the activities of the cell is false.Rate this question:
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- 27.
The term "unicellularity" describes the relatively onstant internal physical conditions of an organism.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The term "unicellularity" refers to the characteristic of an organism being composed of a single cell, rather than multiple cells. It does not describe the internal physical conditions of an organism. Therefore, the statement is false.Rate this question:
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- 28.
Cell membranes are mainly composed of phospholipids and proteins.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Cell membranes are composed of a double layer of phospholipids, known as the lipid bilayer, which forms a barrier between the interior and exterior of the cell. The phospholipids have hydrophilic (water-loving) heads and hydrophobic (water-fearing) tails, arranging themselves in such a way that the heads face the watery environment while the tails face inward, creating a stable structure. Proteins are also embedded within the lipid bilayer, serving various functions such as transport, signaling, and structural support. Therefore, it is true that cell membranes are mainly composed of phospholipids and proteins.Rate this question:
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- 29.
Scientists use a control in an experiment in order to have a standard to compare with any changes.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
In an experiment, scientists use a control as a reference point to compare any changes or effects observed. The control group is kept unchanged and serves as a standard against which the experimental group, which is subjected to the variable being tested, is compared. This allows scientists to determine whether the changes observed in the experimental group are due to the variable being tested or other factors. By having a control, scientists can ensure that their results are reliable and accurate.Rate this question:
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- 30.
Cellulose is one type of lipid.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Cellulose is not a type of lipid. It is a complex carbohydrate that forms the structural component of the cell wall in plants. Lipids, on the other hand, are a diverse group of molecules that include fats, oils, waxes, and steroids. Therefore, the statement that cellulose is a type of lipid is false.Rate this question:
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- 31.
The functions of a protein include structural material, communication in the body, and catalyst for reactions.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Proteins play a crucial role in our body by serving as structural components, facilitating communication between cells, and acting as catalysts for various biochemical reactions. They provide support and shape to cells and tissues, allowing them to function properly. Additionally, proteins act as messengers, transmitting signals within the body to coordinate different processes. Moreover, they speed up chemical reactions by acting as catalysts, thereby enabling essential metabolic processes. Therefore, the statement that proteins have functions as structural material, communication agents, and catalysts for reactions is true.Rate this question:
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- 32.
In photosynthesis, light energy is absorbed by chlorophyll and other pigments.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
During photosynthesis, chlorophyll and other pigments in plants absorb light energy from the sun. This light energy is then converted into chemical energy, which is used to fuel the process of photosynthesis. Without the absorption of light energy by chlorophyll and pigments, plants would not be able to carry out photosynthesis and produce food. Therefore, the statement that light energy is absorbed by chlorophyll and other pigments during photosynthesis is true.Rate this question:
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- 33.
The major end products of the Calvin cycle are glucose and ATP.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The major end products of the Calvin cycle are actually glyceraldehyde-3-phosphate (G3P) and ADP. Glucose is not directly produced in the Calvin cycle, but G3P can be converted into glucose and other carbohydrates in subsequent metabolic pathways. ATP is not a product of the Calvin cycle, but rather a molecule used as an energy source in the cycle.Rate this question:
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- 34.
Energy is released from ATP when a phosphate group is removed.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
ATP (adenosine triphosphate) is a molecule that stores and releases energy in cells. It consists of three phosphate groups. When a phosphate group is removed from ATP, it becomes ADP (adenosine diphosphate) and releases energy. This is because the breaking of the high-energy phosphate bond in ATP is an exothermic reaction, meaning it releases energy. Therefore, the statement that energy is released from ATP when a phosphate group is removed is true.Rate this question:
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- 35.
Two ways a population can decrease in size are
Correct Answer
decreased birthrate and emigrationExplanation
A population can decrease in size through decreased birthrate and emigration. When the birthrate decreases, fewer individuals are being born into the population, leading to a decline in overall population size. Emigration refers to individuals leaving the population and moving to another location. If a significant number of individuals emigrate from a population, it can result in a decrease in population size. Therefore, both decreased birthrate and emigration can contribute to a decrease in the size of a population.Rate this question:
- 36.
If a population grows larger than the carrying capacity of the environment, the
Correct Answer
death rate may rise.Explanation
When a population exceeds the carrying capacity of its environment, it means that there are more individuals than the environment can sustain. This leads to increased competition for limited resources such as food, water, and shelter. As a result, individuals may struggle to meet their basic needs, leading to malnutrition, weakened immune systems, and increased susceptibility to diseases. These factors can contribute to a higher death rate within the population.Rate this question:
- 37.
The gray-brown haze often found over large cities is called
Correct Answer
smogExplanation
Smog refers to the gray-brown haze that is frequently observed over large cities. It is formed when pollutants such as vehicle emissions, industrial fumes, and smoke combine with fog and sunlight. The resulting mixture creates a thick layer of pollution in the atmosphere, which can have detrimental effects on human health and the environment. Smog is a significant issue in urban areas, and efforts are made to reduce emissions and improve air quality to combat its negative impacts.Rate this question:
- 38.
The simplest grouping of more than one kind of organism in the bioshpere is
Correct Answer
a community.Explanation
A community is the simplest grouping of more than one kind of organism in the biosphere. In a community, different species interact and coexist in a specific area. This interaction can be through competition, predation, or mutualism. Communities are dynamic and constantly changing, with organisms adapting to their environment and influencing each other's populations. This grouping allows for the exchange of energy and nutrients among organisms, contributing to the overall functioning of the ecosystem.Rate this question:
- 39.
The term for each step in the transfer of energy and matter within a food web is
Correct Answer
trophic level.Explanation
The term for each step in the transfer of energy and matter within a food web is called a trophic level. Trophic levels represent the different positions that organisms occupy in a food chain, indicating their source of energy and their role in the transfer of nutrients. At each trophic level, energy and matter are passed from one organism to another through feeding relationships. This term helps scientists understand the flow of energy and nutrients through an ecosystem.Rate this question:
- 40.
Matter can recycle through the biosphere because biological systems do not use up matter, they
Correct Answer
transform it.
change it
transfer itExplanation
Biological systems have the ability to transform matter through various processes such as digestion, metabolism, and decomposition. These processes convert matter from one form to another, allowing it to be recycled and reused within the biosphere. Additionally, matter can also be changed or transferred between different organisms or ecosystems, further contributing to the recycling of matter in the biosphere.Rate this question:
- 41.
Nitrogen fixation is carried out primarily by
Correct Answer
bacteria.Explanation
Nitrogen fixation is the process by which atmospheric nitrogen is converted into a form that can be used by plants and other organisms. Bacteria are the primary agents responsible for this process. They possess the enzyme nitrogenase, which enables them to convert atmospheric nitrogen into ammonia. This ammonia can then be further converted into other nitrogen compounds, such as nitrates, that are essential for the growth and development of living organisms. Therefore, bacteria play a crucial role in nitrogen fixation.Rate this question:
- 42.
The diffusion of water across a selectively permeable mebrane is
Correct Answer
osmosisExplanation
Osmosis is the process of water molecules moving from an area of higher concentration to an area of lower concentration across a selectively permeable membrane. In this case, the question is asking for the term that describes the diffusion of water across a selectively permeable membrane, and the correct answer is osmosis.Rate this question:
- 43.
Very large molecules, such as proteins, exit the cell by
Correct Answer
exocytosisExplanation
Exocytosis is the process by which very large molecules, such as proteins, are transported out of the cell. During exocytosis, the molecules are enclosed in vesicles that fuse with the cell membrane, releasing their contents outside the cell. This allows for the controlled and regulated release of substances from the cell.Rate this question:
- 44.
Explain why an increase in temperature can decrease the rate of an enzyme catalyzed reaction.
- 45.
Explain specifically how the passive transport of hydrogen ions is important for the light dependent reactions of photosynthesis.
- 46.
Explain why it is important for cells to have active transport mechanisms.
- 47.
Explain the concept of sustainable development and give an example to illustrate.
- 48.
Compare and contrast photosynthetic producers with chemosynthetic producers.
- 49.
Explain what a keystone species is.
- 50.
Explain the connection between photosynthesis and cellular respiration. (How do the two processes interact with each other?) Why is it necessary for both processes to occur?
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