1.
What controls most of the cell processes and contains the hereditary information of DNA.
Correct Answer
C. Nucleus
Explanation
The nucleus controls most of the cell processes and contains the hereditary information of DNA. It acts as the command center of the cell, regulating gene expression and controlling the synthesis of proteins and other molecules essential for cell function. The hereditary information stored in DNA is responsible for transmitting genetic traits from one generation to the next, and the nucleus plays a crucial role in maintaining and transmitting this information. Mitochondria and chloroplasts have their own DNA but do not contain the complete set of genetic information needed for cell processes. The nucleolus, on the other hand, is involved in the production of ribosomes and not in controlling cell processes or storing hereditary information.
2.
What is a Cell membrane?
Correct Answer
A. A thin flexible barrier around the cell that regulates transport
Explanation
The cell membrane is a thin flexible barrier that surrounds the cell and regulates the transport of molecules in and out of the cell. It acts as a selective barrier, allowing certain substances to enter or leave the cell while preventing others from doing so. This regulation of transport is essential for maintaining the cell's internal environment and ensuring proper functioning.
3.
What is the main function of the Cell Wall?
Correct Answer
A. To protect and provide support for the cell
Explanation
The main function of the cell wall is to protect and provide support for the cell. It acts as a rigid outer layer that surrounds the cell membrane, giving the cell its shape and preventing it from bursting under osmotic pressure. The cell wall also provides mechanical support and protection against physical damage and pathogens. Additionally, it helps in maintaining the structural integrity of the cell and allows for cell-cell communication.
4.
What regulates what enters and leaves the cell and provides protection and support?
Correct Answer
D. Cell Membrane
Explanation
The cell membrane regulates what enters and leaves the cell through its selective permeability, allowing only certain substances to pass through. It also provides protection by acting as a barrier against harmful substances and pathogens. Additionally, the cell membrane provides support to the cell by maintaining its shape and structure. Therefore, the cell membrane is responsible for regulating the movement of molecules, protecting the cell, and providing support.
5.
You will not find a cell wall in which of these kinds of organisms?
Correct Answer
B. Animal
Explanation
Animals do not have a cell wall. While ferns and plants have cell walls made of cellulose, animals do not possess this feature. Animal cells are surrounded by a flexible cell membrane that allows for movement and flexibility, which is not possible with a rigid cell wall.
6.
Which organelle would you expect to find in a plant cell but not a animal cell?
Correct Answer
D. Chloroplast
Explanation
Chloroplasts are the organelles responsible for photosynthesis in plant cells. They contain chlorophyll, which captures sunlight and converts it into energy for the plant. Animal cells do not have chloroplasts because they do not undergo photosynthesis. Instead, animal cells rely on mitochondria to produce energy through cellular respiration. Therefore, chloroplasts are only found in plant cells and not in animal cells.
7.
Which organelle can capture light energy to make it's own food?
Correct Answer
C. The chloroplast
Explanation
The chloroplast is the organelle responsible for capturing light energy to produce food through the process of photosynthesis. It contains chlorophyll, a pigment that absorbs light energy, and other necessary components for the conversion of light energy into chemical energy in the form of glucose. This process is essential for the survival of plants and some other organisms that possess chloroplasts, as it provides them with the energy they need to carry out their metabolic activities.
8.
What part of the cell is identified with the arrow?
Correct Answer
A. The nucleus
Explanation
The arrow in the given question is pointing towards the nucleus. The nucleus is a membrane-bound organelle found in eukaryotic cells. It contains the cell's DNA and is responsible for controlling the cell's activities, including growth, reproduction, and metabolism. The nucleus is often referred to as the control center of the cell, as it houses the genetic material and regulates gene expression.
9.
Which organelles help make energy or create energy for cells?
Correct Answer
C. Mitochondria and chlorplasts
Explanation
Mitochondria and chloroplasts are the organelles that help make or create energy for cells. Mitochondria are responsible for producing ATP, the main energy currency of the cell, through cellular respiration. Chloroplasts, found in plant cells, perform photosynthesis to convert sunlight, water, and carbon dioxide into glucose and oxygen, providing energy for the cell. The other options, rough endoplasmic reticulum, smooth endoplasmic reticulum, Golgi apparatus, and ribosomes, are involved in other cellular processes but not specifically in energy production.
10.
Which part of the plant cell is the chloroplast?
Correct Answer
D. 4
Explanation
The chloroplast is located in part 4 of the plant cell. The chloroplast is an organelle found in plant cells that is responsible for photosynthesis, the process by which plants convert sunlight into energy. It contains chlorophyll, a pigment that gives plants their green color and allows them to absorb light energy. The chloroplast is where the actual photosynthesis takes place, converting carbon dioxide and water into glucose and oxygen.
11.
Which of the following is not part of the cell theory?
Correct Answer
D. All cells must be similar in function
Explanation
The cell theory states that all living things are made up of cells, all cells must come from older cells, and cells are the basic unit of structure and function. However, it does not state that all cells must be similar in function. This means that cells can have different functions and specialize in different tasks within an organism.
12.
Despite differences between plant and animal cells, all eukaryotic cells have cytoplasm and a....
Correct Answer
D. Nucleus
Explanation
All eukaryotic cells, including both plant and animal cells, have a nucleus. The nucleus is a membrane-bound organelle that contains the cell's DNA and controls the cell's activities. It is responsible for storing and transmitting genetic information, as well as regulating gene expression. While plant cells also have a cell wall and animal cells may have flagella for movement, the presence of a nucleus is a common feature in all eukaryotic cells.
13.
If a cell of an organism contains a nucleus, the organism is a(an)
Correct Answer
B. Eukaryote
Explanation
If a cell of an organism contains a nucleus, it means that the organism is a eukaryote. Eukaryotes are organisms whose cells have a distinct nucleus enclosed within a membrane. This is in contrast to prokaryotes, which do not have a nucleus. Plants and animals are examples of eukaryotes, while prokaryotes include bacteria and archaea. Therefore, the correct answer is eukaryote.
14.
Distinct threadlike structures containing genetic information inside the nucleoulus are called
Correct Answer
B. Chromatin
Explanation
Chromatin refers to the distinct threadlike structures inside the nucleolus that contain genetic information. These structures consist of DNA wrapped around proteins called histones. Chromatin plays a crucial role in regulating gene expression and packaging the DNA into a compact form that can fit inside the nucleus. Ribosomes, nuclei, and the Golgi complex are not threadlike structures inside the nucleolus and do not contain genetic information.
15.
Cell membranes are constructed mainly of
Correct Answer
A. Lipid bilayers
Explanation
Cell membranes are primarily composed of lipid bilayers, which consist of two layers of phospholipids arranged with their hydrophilic heads facing outward and their hydrophobic tails facing inward. This arrangement forms a barrier that separates the inside of the cell from its external environment. Lipid bilayers provide the structural integrity of the cell membrane and regulate the movement of substances in and out of the cell. While proteins, carbohydrates, and peripheral proteins also play important roles in cell membranes, lipid bilayers are the main component responsible for their structure and function.
16.
Lipids have a hydrophobic head and two hydrophillic tails.
Correct Answer
B. False
Explanation
Lipids have a hydrophobic tail and a hydrophilic head. This arrangement allows them to form structures such as cell membranes, where the hydrophobic tails face inward and the hydrophilic heads face outward towards the aqueous environment. Therefore, the statement that lipids have a hydrophobic head and two hydrophilic tails is incorrect.
17.
Which cell structures are someitmes found attached to the endoplasmic reticulum?
Correct Answer
D. Ribosomes
Explanation
Ribosomes are sometimes found attached to the endoplasmic reticulum. This is because the endoplasmic reticulum plays a crucial role in protein synthesis, and ribosomes are the cellular structures responsible for protein synthesis. The attachment of ribosomes to the endoplasmic reticulum allows for the efficient transport of newly synthesized proteins into the ER for further processing and modification. This association between ribosomes and the endoplasmic reticulum is essential for the proper functioning of protein synthesis and secretion in the cell.
18.
A salt water solution would be ____________________ to a pure water solution.
Correct Answer
hypertonic
Explanation
A salt water solution would be hypertonic to a pure water solution because it has a higher concentration of solutes (salt) compared to the pure water. This causes water molecules to move from an area of lower solute concentration (pure water) to an area of higher solute concentration (salt water), resulting in a net movement of water out of the pure water solution and into the salt water solution.
19.
Peripheral proteins are structures that can transport material all the way through the cell membrane
Correct Answer
B. False
Explanation
Peripheral proteins are not responsible for transporting material all the way through the cell membrane. Instead, they are found on the surface of the cell membrane and are loosely attached to either the inner or outer surface of the membrane. These proteins play various roles such as cell signaling, enzymatic activity, and structural support, but they do not transport material across the membrane.
20.
Osmosis is the diffusion of water through a selectively permeable membrane.
Correct Answer
A. True
Explanation
Osmosis is the process by which water molecules move from an area of higher concentration to an area of lower concentration through a selectively permeable membrane. This movement occurs to equalize the concentration of solute on both sides of the membrane. Therefore, the statement that osmosis is the diffusion of water through a selectively permeable membrane is true.