Questions
Assertion (A): Lysozyme is an antibacterial enzyme.
Reason (R): The enzyme lysozyme kills bacteria by hydrolysing the (β1 → 4) glycosidic bond between N-acetylglucosamine and N-acetylmuramic acid.
Directions: In the following question, there are two statements: Assertion (A) and Reason (R). Consider both the statements independently and mark your answer as
1. if A and R both are correct and R is correct explanation of A
2. if A and R both are correct and R is not correct explanation of A
3. if A is correct and R is incorrect
4. if A is incorrect and R is correct
5. if A and R both are incorrect
- 1
- 2
- 3
- 4
- 5
Which of the following is an analytical reagent used to detect the presence of soluble proteins?
- Benedict's reagent
- Millon's reagent
- Ehrlich's reagent
- Liebermann's reagent
- Mayer's reagent
Which of the following is a pair of hydrolases?
- Alkaline phosphatase and tyrosinase
- Acetylcholinesterase and tyrosinase
- Acetylcholinesterase and alkaline phosphatase
- Alkaline phosphatase and pyruvate carboxylase
- Acetylcholinesterase and pyruvate carboxylase
Which of the following oxidoreductases acts on CH-NH group of donors?
- Monoamine oxidase
- Biliverdin reductase
- Pyruvate dehydrogenase
- Lactate dehydrogenase
- Dihydrofolate reductase
_____ are globular proteins.
- Beta globulin and fibrin
- Collagen and titin
- Elastin and beta globulin
- Beta globulin and titin
- Collagen and elastin
Molybdenum acts as cofactor in
- ferredoxin hydrogenase
- nitrile hydratase
- carboxylate reductase
- pyridoxal oxidase
- All of the above
Which of the following amino acid residues are specifically recognised by chymotrypsin during peptide bond cleavage?
- Phe
- Trp
- Tyr
- Leu
- Val
- 1, 2 and 3
- 1, 3 and 5
- 2, 3 and 4
- 2, 4 and 5
- 3, 4 and 5
Which of the following statements is/are FALSE regarding haemoglobin?
- Haemoglobin is an allosteric protein.
- Each haemoglobin molecule is able to carry four molecules of O2.
- Binding of oxygen to haemoglobin is non-cooperative.
- Only 1
- Only 2
- Only 3
- Both 1 and 2
- Both 2 and 3
Which of the following agents interferes with oxidative phosphorylation by inhibition of ATP synthase?
- Carbon monoxide
- Antimycin A
- Amytal
- DCMU
- Oligomycin
Oxygen binding curve for myoglobin is _________, which reflects _________ binding.
- hyperbolic, cooperative
- hyperbolic, non-cooperative
- sigmoid, cooperative
- sigmoid, non-cooperative
- None of these
Which of the following organisms has the smallest genome size?
- Bacillus subtilis
- Escherichia coli
- Haemophilus influenza
- Mycoplasma pneumoniae
- Treponema pallidum
A set of globular proteins is
- Albumin, haemoglobin, thrombin
- Haemoglobin, myoglobin, elastin
- Keratin, elastin, myoglobin
- Thrombin, keratin, haemoglobin
- Keratin, haemoglobin, elastin
Which of the following enzymes removes nucleotides from the 5’ ends of a duplex to expose single-stranded 3’ ends?
- Alkaline phosphatase
- Exonuclease III
- Bacteriophage λ exonuclease
- Terminal transferase
- Reverse transcriptase
Arrange the following in correct order of increasing molecular weights:
- Cytochrome c
- Chymotrypsin
- Haemoglobin
- Hexokinase
- 1 < 2 < 3 < 4
- 2 < 4 < 1 < 3
- 3 < 2 < 1 < 4
- 4 < 2 < 3 < 1
- 4 < 3 < 2 < 1
Which of the following is a pair of homopolysaccharides?
- Dextran and heparin
- Dextran and amylopectin
- Heparin and amylopectin
- Heparin and chondroitin-4-sulfate
- Chondroitin-4-sulfate and dextran