Karar's Exam Quiz. 2008 Quiz 1
Aim going to keep trying this quiz till i get 100%
Questions and Answers
- 1.
Consider the following plant cell . the proccess occouring and W would be
- A.
Packaging of molecules.
- B.
Aerobic respiration
- C.
Protien synthesis
- D.
DNA replication
- E.
None of the above
Correct Answer
C. Protien synthesisExplanation
The given plant cell is undergoing protein synthesis. Protein synthesis is the process by which cells build proteins using the information encoded in DNA. It involves transcription, where the DNA sequence is copied into mRNA, and translation, where the mRNA is used as a template to assemble amino acids into a protein. This process is essential for the growth, development, and functioning of cells.Rate this question:
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- 2.
In this plant cell, the light-dependent reactions of photosynthesis occur in structure
- A.
M
- B.
N
- C.
P
- D.
W
- E.
Q
Correct Answer
B. NExplanation
The light-dependent reactions of photosynthesis occur in the chloroplasts, specifically in the thylakoid membranes. These reactions involve the absorption of light energy by chlorophyll and other pigments, which is then used to generate ATP and NADPH. The structure indicated by "N" in the given options is most likely the chloroplast, where the thylakoid membranes are located. Therefore, the correct answer is N.Rate this question:
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- 3.
The tertiary structure of a protein is represented by
- A.
Structure A
- B.
Structure B
- C.
Structure C
- D.
Structure D
- E.
Structure D and A
Correct Answer
C. Structure CExplanation
Structure C represents the tertiary structure of a protein. The tertiary structure refers to the three-dimensional arrangement of the protein's secondary structure elements (alpha helices, beta sheets) and any other loops or folds. It is the final level of protein structure and is determined by the interactions between the amino acid side chains, such as hydrogen bonds, disulfide bonds, and hydrophobic interactions. Therefore, Structure C is the correct representation of the tertiary structure of a protein.Rate this question:
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- 4.
The four main types of biomacromolecules in a cell are
- A.
Monomers, polymers, DNA and RNA.
- B.
Lipids,Protiens,Carbohydrates and Dna
- C.
Nucleic acids, proteins, carbohydrates and lipids.
- D.
Carbon,Hydrogen,Oxygen,Nitrogen
- E.
None of the above
Correct Answer
C. Nucleic acids, proteins, carbohydrates and lipids.Explanation
The correct answer is nucleic acids, proteins, carbohydrates and lipids. These four biomacromolecules are essential components of a cell. Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information. Proteins are involved in various cellular functions, including enzymatic reactions, cell signaling, and structural support. Carbohydrates serve as a source of energy and play a role in cell recognition and communication. Lipids are important for storing energy, forming cell membranes, and acting as signaling molecules. Therefore, these four biomacromolecules are crucial for the structure and function of cells.Rate this question:
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- 5.
The enzyme maltase catalyses the breakdown of maltose into glucose. Maltase was added to a tube containing a solution of maltose in water and incubated at 37°C. The amount of glucose produced was monitored over a period of time. No maltose remained at the end. The graph showing the change in glucose concentration in the tube is
- A.
Picture A
- B.
Picture B
- C.
Picture C
- D.
Picture D
Correct Answer
D. Picture DExplanation
The correct answer is Picture D because it shows a gradual increase in glucose concentration over time, indicating that maltose is being broken down by maltase into glucose. The fact that no maltose remained at the end suggests that all the maltose has been converted into glucose.Rate this question:
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- 6.
The following graph shows the relationship between light intensity and net oxygen uptake or output by a particular green plant. At a light intensity of 10 units
- A.
There is no connection between light intensity and photosynthesis
- B.
The rate of photosynthesis is zero
- C.
The rate of aerobic respiration is zero
- D.
Oxygen produced by photosynthesis is equal to the oxygen used by aerobic respiration.
Correct Answer
D. Oxygen produced by photosynthesis is equal to the oxygen used by aerobic respiration.Explanation
At a light intensity of 10 units, the graph shows that the net oxygen uptake or output by the green plant is at a steady state. This means that the rate of oxygen produced by photosynthesis is equal to the rate of oxygen used by aerobic respiration.Rate this question:
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- 7.
Glycogen is
- A.
an Inhibitor to the enzyme pepsin.
- B.
A polysaccharide found in animal cells.
- C.
A waste product of photosynthesis.
- D.
A polysaccharide found in plant cell walls.
- E.
None of the above
Correct Answer
B. A polysaccharide found in animal cells.Explanation
Glycogen is a polysaccharide found in animal cells. It is the main storage form of glucose in animals and functions as a readily available source of energy. It is stored in the liver and muscles and can be broken down into glucose when needed for energy. Glycogen is not an inhibitor to the enzyme pepsin, a waste product of photosynthesis, or a polysaccharide found in plant cell walls.Rate this question:
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- 8.
Lipids characteristically
- A.
are found in the mitochondria
- B.
Catalyse reactions
- C.
Store fat
- D.
Are hydrophobic
- E.
None of the above
Correct Answer
D. Are hydrophobicExplanation
Lipids are hydrophobic molecules, meaning they repel or do not mix well with water. This characteristic is due to their nonpolar nature and the presence of hydrocarbon chains in their structure. Lipids play various roles in the body, including energy storage, insulation, and protection of organs. They are also important components of cell membranes. Therefore, the statement "lipids are hydrophobic" accurately describes their fundamental property.Rate this question:
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- 9.
The lymphatic system
- A.
Controls blood clotting.
- B.
Contains phagocytic cells.
- C.
Contains red blood cells.
- D.
Is not found in animals.
Correct Answer
B. Contains phagocytic cells.Explanation
The lymphatic system is a network of vessels, nodes, and organs that help to maintain fluid balance in the body and also play a crucial role in the immune response. One of the important functions of the lymphatic system is to contain phagocytic cells, which are specialized immune cells that engulf and destroy foreign particles, pathogens, and cellular debris. These cells help in the defense against infections and play a vital role in maintaining overall health and immunity.Rate this question:
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- 10.
In a multicellular organism, the term ‘internal environment’ refers to the
- A.
Cytoplasim
- B.
The blood vessels
- C.
The extracellular fluid
- D.
A single cell in a multicellular organism
Correct Answer
C. The extracellular fluidExplanation
The term 'internal environment' in a multicellular organism refers to the extracellular fluid. This fluid surrounds the cells and provides them with nutrients, oxygen, and removes waste products. It also helps in maintaining a stable internal environment by regulating temperature, pH, and ion concentrations. The extracellular fluid is essential for the proper functioning of cells and allows for communication and coordination between different cells and tissues in the organism.Rate this question:
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- 11.
- A.
Answer A
- B.
Answer B
- C.
Answer C
- D.
Answer D
Correct Answer
B. Answer B -
- 12.
Insulin is a complex protein that is said to have a quaternary structure. This means that insulin
- A.
Has more then one polypeptide.
- B.
It means Insulin can not be made of polypeptides
- C.
Insulin can also have a functioning secondary structure
- D.
Insulin is denatures
Correct Answer
A. Has more then one polypeptide.Explanation
Insulin is a complex protein that is composed of multiple polypeptide chains. These polypeptide chains come together to form the quaternary structure of insulin. Therefore, the statement "Has more than one polypeptide" is the correct explanation for the quaternary structure of insulin.Rate this question:
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- 13.
First-line defences that mammals have against invasion by disease-causing bacteria include
- A.
Antibiotics
- B.
Lysozymes
- C.
Antibodies
- D.
Killer T cells
Correct Answer
B. LysozymesExplanation
Lysozymes are enzymes found in the tears, saliva, and mucus of mammals that help protect against bacterial infections. They work by breaking down the cell walls of bacteria, causing them to burst and die. This is an important first-line defense mechanism as it helps to prevent the bacteria from entering the body and causing harm. Antibiotics, antibodies, and killer T cells are also important components of the immune system, but they are not specifically mentioned as first-line defenses against bacteria in this question.Rate this question:
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- 14.
Diphtheria is a disease caused by the bacterium Corynebacterium diphtheriae. A six-month old baby boy, whose mother and father both had diphtheria as children, will develop active immunity against diphtheria if he
- A.
If both is father and mother were immunised as children
- B.
If he recives an injection of dead diphtheria cells
- C.
Receives injections of gamma globulin from the mother.
- D.
Is being breast-fed by the mother.
Correct Answer
B. If he recives an injection of dead diphtheria cellsExplanation
If the baby receives an injection of dead diphtheria cells, he will develop active immunity against diphtheria. This is because the injection of dead diphtheria cells will stimulate the baby's immune system to produce antibodies against the disease. These antibodies will provide protection against future infections of diphtheria.Rate this question:
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- 15.
Facilitated diffusion is a form of cell transport that
- A.
Moves oxygen and carbon dioxide across membranes.
- B.
Occurs against a concentration gradient.
- C.
Uses energy supplied by ATP.
- D.
Is not used by plant cells
- E.
Requires specific protein channels.
Correct Answer
E. Requires specific protein channels.Explanation
Facilitated diffusion is a process that allows the movement of certain molecules, such as oxygen and carbon dioxide, across cell membranes. Unlike active transport, facilitated diffusion does not occur against a concentration gradient and does not require the use of ATP for energy. However, it does require the presence of specific protein channels in the membrane through which the molecules can pass. Plant cells also utilize facilitated diffusion, making the statement that it is not used by plant cells incorrect. Therefore, the correct answer is that facilitated diffusion requires specific protein channels.Rate this question:
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- 16.
The part of the virus labelled R is its
- A.
Antigenic marker.
- B.
Viral genome.
- C.
Protien coat.
- D.
Cell membrane.
- E.
None of the above.
Correct Answer
C. Protien coat.Explanation
The correct answer is protein coat. The protein coat, also known as the capsid, is the outer covering of a virus. It is made up of protein molecules and serves to protect the viral genome, which is the genetic material of the virus. The protein coat plays a crucial role in the attachment of the virus to host cells and in the delivery of the viral genome into the host cell. It also helps in the recognition of the virus by the immune system. Therefore, the protein coat is an important component of the virus and can be considered as its antigenic marker.Rate this question:
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- 17.
A typical characteristic of such a virus is that it
- A.
Is destroyed by antibiotics.
- B.
Manipulates the host cell’s DNA to produce copies of itself.
- C.
Releases toxins into the body of the host.
- D.
Evades detection by the host’s immune system.
Correct Answer
B. Manipulates the host cell’s DNA to produce copies of itself.Explanation
This answer is correct because it describes a typical characteristic of a virus. Viruses are known to manipulate the DNA of host cells in order to reproduce and create copies of themselves. This process allows the virus to spread and infect other cells. Antibiotics are not effective against viruses because they target bacteria, not viruses. Viruses can also release toxins into the host's body, but this is not a characteristic that is typical of all viruses. Additionally, some viruses can evade detection by the host's immune system, but this is not a defining characteristic of all viruses.Rate this question:
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- 18.
- A.
Glucose and fructose are polysaccharides.
- B.
The production of sucrose is an endergonic reaction.
- C.
Sucrose is a reactant and glucose is a product of the reaction.
- D.
A molecule of fructose contains more stored energy than a molecule of sucrose.
Correct Answer
B. The production of sucrose is an endergonic reaction. -
- 19.
Activation energy in a biological reaction
- A.
Is required by an enzyme to denature
- B.
Is the energy needed to start a reaction
- C.
Increases with an increase in temperature.
- D.
Is involved in the formation of complex molecules only.
Correct Answer
B. Is the energy needed to start a reactionExplanation
Activation energy is the minimum amount of energy required for a chemical reaction to occur. It is the energy needed to break the bonds of the reactant molecules and initiate the formation of new bonds to create the products. Without sufficient activation energy, the reaction will not proceed. Therefore, the statement "is the energy needed to start a reaction" accurately describes the concept of activation energy.Rate this question:
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