Biology MCQ on ProteinsThe following section consists of Biology Multiple Choice questions on Proteins For competitions and exams. Select the correct option to test your skills on Proteins.
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Proteins
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Question 1 of 20
1. Question
An amino acid that does not form an α-helix is
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Question 2 of 20
2. Question
An amino acid not found in proteins is
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Question 3 of 20
3. Question
In mammalian tissues serine can be a biosynthetic precursor of
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Question 4 of 20
4. Question
A vasodilating compound is produced by the decarboxylation of the amino acid:
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Question 5 of 20
5. Question
Biuret reaction is specific for
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Question 6 of 20
6. Question
Sakaguchi’s reaction is specific for
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Question 7 of 20
7. Question
Million-Nasse’s reaction is specific for the amino acid:
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Question 8 of 20
8. Question
Ninhydrin with evolution of CO2 forms a blue complex with
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Question 9 of 20
9. Question
The most of the ultraviolet absorption of proteins above 240 nm is due to their content of
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Question 10 of 20
10. Question
Which of the following is a dipeptide?
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Question 11 of 20
11. Question
Which of the following is a tripeptide
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Question 12 of 20
12. Question
A peptide which acts as potent smooth muscle hypotensive agent is
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Question 13 of 20
13. Question
A tripeptide functioning as an important reducing agent in the tissues is
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Question 14 of 20
14. Question
An example of metalloprotein is
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Question 15 of 20
15. Question
Carbonic anhydrase is an example of
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Question 16 of 20
16. Question
An example of chromoprotein is
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Question 17 of 20
17. Question
An example of scleroprotein is
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Question 18 of 20
18. Question
Casein, the milk protein is
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Question 19 of 20
19. Question
An example of phosphoprotein present in egg yolk is
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Question 20 of 20
20. Question
A simple protein found in the nucleoproteins of the sperm is
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Proteins2
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Question 1 of 20
1. Question
All proteins contain the
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Question 2 of 20
2. Question
Proteins contain
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Question 3 of 20
3. Question
The optically inactive amino acid is
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Question 4 of 20
4. Question
At neutral pH, a mixture of amino acids in solution would be predominantly:
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Question 5 of 20
5. Question
The true statement about solutions of amino acids at physiological pH is
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Question 6 of 20
6. Question
pH (isoelectric pH) of alanine is
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Question 7 of 20
7. Question
Since the pK values for aspartic acid are 2.0, 3.9 and 10.0, it follows that the isoelectric (pH) is
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Question 8 of 20
8. Question
Sulphur containing amino acid is
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Question 9 of 20
9. Question
An example of sulphur containing amino acid is
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Question 10 of 20
10. Question
All the following are sulphur containing amino acids found in proteins except
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Question 11 of 20
11. Question
An aromatic amino acid is
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Question 12 of 20
12. Question
The functions of plasma albumin are
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Question 13 of 20
13. Question
An example of α-amino acid not present in proteins but essential in mammalian metabolism is
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Question 14 of 20
14. Question
An essential amino acid in man is
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Question 15 of 20
15. Question
Non essential amino acids
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Question 16 of 20
16. Question
Which one of the following is semiessential amino acid for humans?
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Question 17 of 20
17. Question
An example of polar amino acid is
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Question 18 of 20
18. Question
The amino acid with a nonpolar side chain is
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Question 19 of 20
19. Question
A ketogenic amino acid is
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Question 20 of 20
20. Question
Which of the following types of interactions are important in forming secondary structures such as alpha helices and beta sheets in proteins?
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Proteins3
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Question 1 of 20
1. Question
Which of the following statementsis about the hydrolysis of ATP to produce ADP and Pi are true?
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Question 2 of 20
2. Question
The “R” group (side chain) of the amino acid glutamate is –CH2–CH2–COOH. What properties would you expect this side chain to have?
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Question 3 of 20
3. Question
Which of the following are true of enzymes?
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Question 4 of 20
4. Question
What kinds of bonds hold together the primary structure of a protein?
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Question 5 of 20
5. Question
Which of these is an accurate statement of the consequences of the second law of thermodynamics
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Question 6 of 20
6. Question
What is the role of an enzyme in a reaction?
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Question 7 of 20
7. Question
Adenine forms a complementary pair with ____ in RNA and _____ in DNA
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Question 8 of 20
8. Question
Which of the following serves as an “adapter” in protein synthesis and bridges the gap between mRNA and proteins?
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Question 9 of 20
9. Question
An anticodon is part of
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Question 10 of 20
10. Question
Which of the following is true for BOTH prokaryotic and eukaryotic gene expression?
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Question 11 of 20
11. Question
A particular EUKARYOTIC protein is 300 amino acids long. Which of the following could be the number of nucleotides in the DNA that codes for this protein?
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Question 12 of 20
12. Question
Which mutation would be most likely to have a catastrophic effect on the functioning of a protein?
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Question 13 of 20
13. Question
When messenger RNA is first synthesized it may include long sequences of bases that do not code for amino acids. These noncoding sequences are called —– and are found in _____ cells.
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Question 14 of 20
14. Question
RNA differs from DNA in that RNA
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Question 15 of 20
15. Question
A frameshift mutation could result from
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Question 16 of 20
16. Question
The processing of the RNA transcript involves
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Question 17 of 20
17. Question
The genetic code is redundant. This means
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Question 18 of 20
18. Question
How many different types of amino acid are used to make proteins?
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Question 19 of 20
19. Question
Amino acids contain carbon, hydrogen, oxygen, and what other main element?
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Question 20 of 20
20. Question
At what pH value do most enzymes work best?
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Proteins4
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Question 1 of 20
1. Question
Which of these is not a globular protein?
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Question 2 of 20
2. Question
Proteins are made from long, folded chain molecules. What are these chains called?
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Question 3 of 20
3. Question
Disulphide bridges help to maintain which aspect of protein structure?
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Question 4 of 20
4. Question
Why is haemoglobin described as a ‘conjugated protein’?
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Question 5 of 20
5. Question
Which of these will not normally denature a protein?
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Question 6 of 20
6. Question
The primary structure of a protein is held together by:
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Question 7 of 20
7. Question
Which of these is a protein?
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Question 8 of 20
8. Question
How does a competitive inhibitor prevent an enzyme from doing its job?
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Question 9 of 20
9. Question
What type of reaction is catalysed by protease enzymes?
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Question 10 of 20
10. Question
The poisonous gas cyanide, which prevents normal respiration, is an example of:
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Question 11 of 20
11. Question
Enzymes are catalysts. What does this mean?
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Question 12 of 20
12. Question
Lipase, which breaks down fats in the small intestine, is:
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Question 13 of 20
13. Question
All of the following are true of protein denaturation except that it
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Question 14 of 20
14. Question
There are several levels of protein structure, the most complex of which is
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Question 15 of 20
15. Question
Glucose is a
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Question 16 of 20
16. Question
Double helix describes the structure of a molecule of
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Question 17 of 20
17. Question
The globular shape of a protein is called the
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Question 18 of 20
18. Question
What happens during a hydrolysis reaction?
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Question 19 of 20
19. Question
What type of macromolecule carries out catalysis in biological systems?
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Question 20 of 20
20. Question
At what level(s) of protein structure would you expect to find disulfide bridges?