9. Which of the following nucleobases in the nucleic acid DNA specifically interact with proteins the most?
(A) Cytosine
(B) Thymine
(C) Uracil
(D) Adenine
(E) Guanine

III. Single choice questions.1. Which of the following amino acid residues which does not have a preferred location at α-helix? (A) Glu (B) Arg (C) Val (D) His (E) None of the above

2. Which of the following transports does not involve proteins? (A) Facilitated diffusion (B) Passive diffusion (C) Active transport (D) Monovalent metal transport (E) Glucose transport

3. Which of the followings regarding cAMP is not True? (A) An intracellular second messenger molecule (B) To activate catabolite activator protein (C) cAMP is low when glucose is the carbon source (D) An important energy source in cells (E) Involved in gene regulation in response to hormones and nutrients

4. How is the extent of supercoiling measured? (A) Lk – Lk0 (B) Lk – Lk0 + Wr (C) Lk0 – Lk (D) Lk0 – Lk + Wr (E) Lk + Lk0 + Wr

5. Which of the followings regarding eukaryotic RNA processings is True? (A) Co-transcriptional (B) 5′ modification by addition of cytosine (C) exons are removed (D) 3′ modification by a DNA-dependent RNA Pol (E) Regulated by sigma factors

6. DNA melting is not (A) DNA denaturation (B) a process that dsDNA comes apart (C) involving breakage of covalent bonds (D) a hyperchromicity effect (E) happening in bacterial cells

7. Which of the followings regarding Wobble base-pairs is not true? (A) Non Watson-Crick (B) Might involve inosine (C) Mostly G=U pair (D) Only happens between codons and anti-codons (E) explain why the numbers of tRNA could be smaller than the number of sense codons

8. Which of the followings is the allosteric regulation of glycogen phosphorylase? (A) Activation by phosphorylation of a serine in the active site (B) Activation by negative allosteric effector AMP (C) Inhibition by phosphorylation of a serine in the active site (D) Inhibition by negative allosteric effector AMP (E) All of the above

10. Which of the followings is not true? (A) Hemoglobin is a homologue of myoglobin (B) Hemoglobin is a tetramer whereas myoglobin is a monomer. (C) Hemoglobin exhibits a sigmoidal O saturation curve while myoglobin exhibits a hyperbolic curve. (D) Hemoglobin exhibits O 2 binding cooperativity while myoglobin does not. (E) Hemoglobin exhibits a higher degree of O 2 saturation at all physiologically relevant partial pressures of O 2 than does myoglobin.

11. When molecules are being built by chemical reactions it is called? (A) anabolism (B) catabolism (C) fermentation (D) metabolism (E) sterilization

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