Free Proteins MCQs with Answers
99 Proteins MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Proteins are polymers of amino acids joined by peptide bonds, and their function depends on primary, secondary, tertiary and quaternary structure. The topic covers fibrous and globular proteins, enzymes, antibodies, hormones and transport proteins, as well as denaturation by heat or extreme pH.
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- A. Inorganic bonds
- B. Peptide bonds
- C. Glucosidic bonds
- D. Covalent bonds
Explanation: The basic unit of protein are amino acids. There are approximately 20 types of amino acids found in our body.
Correct answer: Peptide bonds- A. Fibrous
- B. Structural
- C. Enzymatic
- D. All of the Above
Explanation: Fibrin is a fibrous protein and specifically, it is the main component of blood clots.
Correct answer: Fibrous- A. Lipids
- B. DNA
- C. RNA
- D. Protein
Explanation: A peptide is a short string of numerous amino acids, formed by a condensation reaction, joining together through a covalent bond.
Correct answer: Protein- A. 20
- B. 24
- C. 23
- D. 25
Explanation: Scientists now recognize twenty-two amino acids as the building blocks of proteins: the twenty common ones and two more, selenocysteine…
Correct answer: 20- A. Globular
- B. Functional
- C. Fibrous
- D. Both A and B
Explanation: Antibodies are both globular and functional proteins. They are globular because they are not crystalline and they have a specific…
Correct answer: Both A and B- A. Ionic
- B. Hydrogen
- C. Peptide
- D. Glycosidic
Explanation: The tertiary structure of proteins are connected by monomers of amino acid by the peptide bond.The structure is composed of hydrogen…
Correct answer: Glycosidic- A. Fats /cholestrol
- B. ATP
- C. Not known without screening test
- D. Ligase
Explanation: Ligase happens to be an enzyme, catalysing lipids. Since enzymes are proteins, ligase is also a protein.
Correct answer: Ligase- A. Acid
- B. Base
- C. Neutral
- D. None of these
Explanation: The following question requires the candidate to have the basic knowledge of the structue of amino acid and it's behavior in…
Correct answer: Acid- A. 25
- B. 20
- C. 19
- D. 15
Explanation: "About 170 types of amino acids have been found to occur in cells and tissues. Of these, about 25 are constituents of proteins.
Correct answer: 25- A. Primary structure
- B. Tertiary structure
- C. Secondary structure
- D. Quaternary structure
Explanation: The tertiary structure is the overall folding of the polypeptide chain, and it is determined by the interactions between the side chains…
Correct answer: Tertiary structure- A. C-N link
- B. C-O link
- C. N-H link
- D. C-H link
Explanation: Correct option A. Since peptide bond is an amide type of covalent chemical bonding formed between the alpha nitrogen of one amino acid and…
Correct answer: C-N link- A. 575
- B. 576
- C. 574
- D. 573
Explanation: Correct option: C (fact) (There are 574 amino acids in a haemoglobin molecule).A haemoglobin molecule consists of a total of 574 amino…
Correct answer: 574- A. Globular
- B. Functional
- C. Fibrous
- D. Both Options A and B are correct
Explanation: Antibodies belong to a group of globular proteins in serum or plasma; they are therefore also known as immunoglobulins.
Correct answer: Globular- A. 250
- B. 200
- C. 20
- D. 170
Explanation: The total number of amino acids that have been found in tissues and cells are 170. 20 types of amino acids make proteins.
Correct answer: 170- A. Skin
- B. Hair
- C. Nails
- D. Body fat
Explanation: Proteins are not typically present in body fat. Body fat, also known as adipose tissue, is primarily made up of adipocytes (fat cells)…
Correct answer: Body fat- A. Acid
- B. Base
- C. Neutral
- D. None of these options are correct
Explanation: Correct option is B. Based on the definition of the acidic medium, in acidic conditions the amino acid acts as a base and accepts a proton…
Correct answer: Base- A. 1
- B. 3
- C. 2
- D. 4
Explanation: Insulin is a protein made up of two polypeptide chains referred to as the A chain and the B chain.
Correct answer: 2- A. A protein
- B. Globular protein
- C. Functional protein
- D. Secretive protein
Explanation: If amino acids are formed together by peptide bonds, they form proteins. Amino acids are the building blocks of protein.
Correct answer: A protein79. Which structure of protein gives information about the number and sequence of amino acids in it?
- A. Primary structure
- B. Secondary structure
- C. Tertiary structure
- D. Quarternary structure
Explanation: The linear sequence of amino acids within a protein is considered the primary structure of the protein.
Correct answer: Primary structure- A. Primary structure
- B. Secondary structure
- C. Tertiary structure
- D. Quaternary structure
Explanation: A protein molecule is made up of many amino acid molecules which are attached by peptide bonds.
Correct answer: Primary structure