Biochemistry-I MCQs | BIO202 MCQs | Set 4 | Query Point Official
Biochemistry-I MCQs | BIO202 MCQs | Set 4
MCQs (Multiple Choice Questions)
1) Which of the following shows the greatest tendency to form α helices in most experimental model systems?
a) Glycine
b) Alanine
c) Proline
d) Serine
Correct Answer:
The correct answer is 'b'.
Explanation:
In most experimental model systems, alanine has the greatest tendency to form α-helices among the options listed. This is because alanine's relatively small and non-bulky side chain allows for a more stable and regular α-helix structure. Proline, on the other hand, is known to disrupt α-helical structures due to the constraints imposed by its cyclic side chain.
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2) Immunoglobulin G (IgG) consists of __________.
a) Two heavy chains and two light chains
b) Four heavy chains
c) Four light chains
d) None of these
Correct Answer:
The correct answer is 'a'.
Explanation:
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3) The free energy of a protein molecule is influenced by _________.
b) hydrogen bonds
d) All of these
Correct Answer:
The correct answer is 'd'.
Explanation:
The free energy of a protein is affected by factors such as hydrophobicity, hydrogen bonds, and electrostatic interactions, among others. These interactions and properties play a significant role in determining the stability and folding of protein structures, and they influence the protein's free energy.
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4) Proteins are denatured by ____________.
a) Temperature Ph
b) organic solvents
c) temperature, pH, organic solvents
d) None
Correct Answer:
The correct answer is 'c'.
Explanation:
Proteins can be denatured by changes in temperature, pH, and exposure to organic solvents. These factors can disrupt the native three-dimensional structure of proteins, leading to denaturation.
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5) About ________ of amino acid residues in the myoglobin are found in alpha helices.
a) 98%
b) 78%
c) 27%
d) 10%
Correct Answer:
The correct answer is 'b'.
Explanation:
Myoglobin is a globular protein found in muscle cells. It stores oxygen and releases it to the muscle cells during exercise. Myoglobin has a very high alpha helical content, with about 78% of its amino acid residues in alpha helices.
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6) Hemoglobin is found exclusively in ______________.
a) white blood cells
b) red blood cells
c) platelets
d) platelets and white blood cells
Correct Answer:
The correct answer is 'b'.
Explanation:
Hemoglobin is found exclusively in red blood cells (erythrocytes). It is a protein that is responsible for binding to and transporting oxygen in the bloodstream. Hemoglobin gives red blood cells their characteristic red color.
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7) Starch is an example of
a) Polysaccharides
b) Monosaccharides
c) Disaccharides
d) Oligosaccharides
Correct Answer:
The correct answer is 'a'.
Explanation:
Starch is a polysaccharide. It is composed of multiple glucose molecules linked together and serves as a storage form of energy in plants.
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8) Which one of the following is not a property of carbohydrates?
a) Raw material for glycolysis
b) Major source of energy
c) Glucose is important
monomer
d) Contain many amino acids
Correct Answer:
The correct answer is 'd'.
Explanation:
Carbohydrates do not typically contain amino acids as a part of their structure. Carbohydrates are primarily composed of carbon, hydrogen, and oxygen atoms and are an important source of energy for living organisms. Glucose is indeed an important monomer in carbohydrate structures, and they can serve as a raw material for glycolysis and a major source of energy. However, they are distinct from proteins, which are composed of amino acids.
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9) Starch is found in _________.
a) Viruses
b) Bacteria
c) Plants
d) Animals
Correct Answer:
The correct answer is 'c'.
Explanation:
Starch is primarily found in plants. It serves as a storage form of energy in plant cells, much like glycogen serves as an energy storage molecule in animals.
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10) C6H12O6 is th formula of ________.
a) Maltose
b) Lactose
c) Sucrose
d) Glucose
Correct Answer:
The correct answer is 'd'.
Explanation:
The chemical formula C6H12O6 corresponds to glucose, which is a monosaccharide and one of the most important simple sugars in biology.
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Frequently Asked Questions (FAQs)
What is the semi-conservative model of DNA replication?
In the semi-conservative model, each original DNA strand serves as a template for a new strand, resulting in two DNA molecules with one old and one new strand.
What is a peptide bond?
A peptide bond is a chemical bond that links the amino group of one amino acid to the carboxyl group of another.
Why is ATP considered the energy currency of the cell?
ATP stores and provides energy for many cellular processes through the removal of phosphate groups.
Which base is unique to RNA?
Uracil is found in RNA instead of thymine, which is present in DNA.
What is a nucleotide?
A nucleotide is the basic structural unit of nucleic acids, composed of a sugar, phosphate group, and nitrogenous base.
Related Topics
For more Introduction to BIOCHEMISTRY I topics, visit BIOLOGY Notes & MCQs.
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