Biochemistry In Biotechnology — Part 1 MCQs with Explanations

All parts of a fold can be classified as helices, strands or turns is the correct answer to “Which one of the following is INCORRECT about protein structures”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Lysine is the correct answer to “Which one of the following amino acids has three ionizable groups”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

2 ATP and 0 NADH is the correct answer to “During lactic acid fermentation, net yield of ATP and NADH per mole of glucose is”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Transamination is the correct answer to “The reactions leading to the formation of amino acids from the TCA cycle intermediates are”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

$$\frac{{{k_{cat}}}}{{{K_M}}}$$ is the correct answer to “The catalytic efficiency for an enzyme is defined as”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

P and Q only is the correct answer to “Which of the following types of molecules act as biological catalysts? P. Protein Q. RNA R. Phospholipid”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Arg is the correct answer to “Which one of the following amino acids has the highest probability to be found on the surface of a typical globular protein in aqueous environment”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

(A) is true but (R) is false is the correct answer to “Determine the correctness or otherwise of the following Assertion (A) and the Reason (R) . Assertion: A very low amount of inhibitor can act as an activator for allosteric enzymes. Reason: Allosteric enzymes follow Michaelis-Menten kinetics.”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

One molecule each of 3-phosphoglycerate and 2-phosphoglycolate is the correct answer to “During photorespiration under low CO 2 and high O 2 levels, O 2 reacts with ribulose 1, 5-bisphosphate to yield”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

6 × 107 IU is the correct answer to “The activity of an enzyme is expressed in International Units (IU). However, the SI unit for enzyme activity is Katal. One Katal is”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

8.5 is the correct answer to “The molarity of water in a water: ethanol mixture (15 : 85, v/v) is approximately”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

A mixture of α-D-Glucose and β-D-Glucose is the correct answer to “The product(s) resulting from the hydrolysis of maltose is/are”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

P-4, Q-1, R-3, S-2 is the correct answer to “Match the vitamins in Group I with the processes/ reactions in Group II . Group I Group II P. Pantothenic acid 1. Electron transport Q. Vitamin B 2 2. Transfer of 1-C units R. Vitamin B 6 3. Decarboxylation S. Folic acid 4. Fatty acid metabolism 5. Hydrolysis”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Pentose phosphate pathway is the correct answer to “An alternative to glycolysis pathway is”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Lactose and cellobiose is the correct answer to “Disaccharide molecules that contain β(1→ 4) glycosidic linkage are”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

10-8 M is the correct answer to “The dissociation constant K d for ligand binding to the receptor is 10 -7 M. The concentration of ligand required for occupying 10% of receptors is”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Glycolysis is the correct answer to “Which one of the following metabolic processes in mammalian cells does NOT occur in the mitochondria”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

-18.5 kJ mol-1 is the correct answer to “The ΔG° for the oxidation of NADH by FAD is”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

P-3, Q-4, R-2, S-1 is the correct answer to “Match the high energy compounds in Group I with the biosynthetic pathways for the molecules in Group II . Group I Group II P. GTP 1. Fatty acid Q. UTP 2. Phospholipid R. CTP 3. Protein S. Acyl coenzyme A 4. Peptidoglycan”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Ratio of unsaturated to saturated fatty acids would increase is the correct answer to “If a plant is shifted to cold temperature, which of the following changes would take place in its membrane”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

P-4, Q-3, R-2, S-1 is the correct answer to “Match items in Group I with Group II . Group I Group II P. Glycolytic pathway 1. Chloroplast Q. Eukaryotic oxidative metabolism 2. Glyoxysomes R. Glyoxylate cycle 3. Mitochondria S. Calvin cycle 4. Cytosol”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

-17.19 kJ mol-1 is the correct answer to “The value of ΔG°, if given K ep is 1.7, at 23°C will be”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Negative ΔG° is the correct answer to “Oxidation reduction reactions with positive standard redox potential (ΔE°) have”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Glutamate dehydrogenase is the correct answer to “Identify the enzyme that catalyzes the following reaction. $$\alpha {\text{ - Ketoglutarate}} + NADH + NH_4^ + + {H^ + } \to {\text{Glutamate}} + NA{D^ + } + {H_2}O$$”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

P-3-a, Q-2-a, R-1-b is the correct answer to “Match the following photoreceptors with their prosthetic groups and spectral specificity Photoreceptor Moiety that absorbs light Absorption (nm) P. Phototropin 1. Chromobilin a. 400 - 500 Q. Cryptochrome 2. FAD b. 600 - 800 R. Phytochrome 3. FMN c. 500 - 600”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Non-competitive inhibition is the correct answer to “The degree of inhibition for an enzyme catalyzed reaction at a particular inhibitor concentration is independent of initial substrate concentration. The inhibition follows”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Pro is the correct answer to “Which one of the following amino acid residues will destabilize an α-helix when inserted in the middle of the helix”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Both (A) and (R) are true but (R) is not the correct reason for (A) is the correct answer to “Determine the correctness or otherwise of the following Assertion (A) and Reason (R) . Assertion: Plants convert fatty acids into glucose. Reason: Plants have peroxisomes.”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

The velocity of E1 catalyzed reaction is always greater than that of E2 is the correct answer to “The turnover numbers for the enzymes E1 and E2 are 150 s -1 and 15 s -1 respectively. This means”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

P-2, Q-4, R-1, S-3 is the correct answer to “Match the chemicals in Group I with the possible type/class in Group II . Group I Group II P. Picloram 1. Vitamin Q. Zeatin 2. Auxin R. Thiamine 3. Amino Acid S. Glutamine 4. Cytokinin”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Apoprotein is the correct answer to “A protein without its prosthetic group is known as”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

At the carboxy side of the strands is the correct answer to “The active site in the alpha/beta barrel structures is usually located”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Enzymes do not accelerate the rate of reverse reaction is the correct answer to “Identify the statement that is not applicable to an enzyme catalyzed reaction.”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Valine is the correct answer to “Amino acid residue which is most likely to be found in the interior of water-soluble globular proteins is”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Asparagine is the correct answer to “In N-linked glycosylation, the oligosaccharide chain is attached to protein by”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

P, Q, R and S is the correct answer to “Which of the following components constitute a molecular mechanics force field? P. Bond stretching Q. Bond angle bending R. Torsional bond rotation S. Non-bonded interactions”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Multidrug resistance protein is the correct answer to “Which one of the following is an ABC transporter”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

Only the amino group is ionized is the correct answer to “Natural proteins are composed primarily of 20 α-amino acids. Which one of the following statements is true for any of these amino acids in a solution of pH 1.5”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

A transition state analogue in enzyme catalyzed reaction increases the rate of product formation is the correct answer to “Which one of the following statements is NOT true”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.

AVRYSR is the correct answer to “Analysis of a hexapeptide using enzymatic cleavage reveals the following result: • Amino acid composition of the peptide is: 2R, A, V, S, Y • Trypsin digestion yields two fragments and the compositions are: (R, A, V) and (R, S, Y) • Chymotrypsin digestion yields two fragments and the compositions are: (A, R, V, Y) and (R, S) • Digestion with carboxypeptidase A yields no cleavage product. Given: Trypsin cleaves at carboxyl side of R. Chymotrypsin cleaves at carboxyl side of Y. Carboxypeptidase A cleaves at amino side of the C-terminal amino acid (except R and K) of the peptide. The correct amino acid sequence of the peptide is:”. This question is standard in competitive examination syllabi for Biochemistry In Biotechnology.