38. Which of the following is not a structural motif encountered in DNA-binding proteins?
(A) helix-turn-helix
(B) leucine zipper
(C) zinc finger 
(D) β-barrel

39. The sequences in eukaryotic DNA known as introns are (A) those included in the final sequence of messenger RNA (B) the intervening sequences not expressed in the final sequence of messenger RNA (C) the binding sites for DNA polymerase (D) the binding sites for RNA polymerase

40. Which of the following is true about micro RNAs? (A) They are a type of non-coding RNA (B) They are a type of small interfering RNA (C) They have been found only in simple organisms like roundworms (D) All of these are true

41. Which of the following codons does not code for an amino acid? (A) AUG (B) UAA (C) CAU (D) GUU (E) All of these code for an amino acid

42. The initial step in the formation of an aminoacyl-tRNA is (A) esterification of the tRNA (B) activation of the amino acid by reaction with ATP (C) activation of the tRNA by reaction with ATP (D) interaction of the mRNA with the tRNA

43. Which linkage best describes the covalent bond between an amino acid (AA) and its tRNA? (A)Amino group of AA linked to 5' -OH of tRNA. (B)A mino group of AA linked to 5' phosphate of tRNA. (C)Carboxyl group of AA linked to 3' -OH of tRNA. (D)Carboxyl group of AA linked to 3' phosphate of tRNA.

44. What is the start codon on the mRNA for prokaryotic translation? (A) AUG (B) UAA (C) UAG (D) UGA

45. A Shine-Dalgarno Sequence is a (A)sequence of nucleotides in the DNA that interacts with the begin transcription. (B)sequence of nucleotides in an mRNA that interacts with the small subunit of a ribosome to begin translation. (C)sequence of nucleotides in the DNA that interacts with -protein to terminate transcription. (D)sequence of nucleotides in an mRNA that functions to terminate translation.

46. The final form of mRNA in eukaryotes has all these features, except: (A) There will be a special nucleotide cap on the 5' end of the mRNA. (B) There is usually a poly A tail on the 3' end of the mRNA. (C) The mature, active mRNA contains introns. (D) Only a single protein is made from any mature mRNA molecule. (E) All of these are true.

47. The protein which marks proteins for degradation is called: (A) Chaperonin (B) Ubiquitin (C) Proteasomin (D) Apoptosin (E) None of these names is correct.

48. The ultimate electron acceptor in the electron transport chain is (A) NAD+ (B) FAD. (C) oxygen. (D) ADP.

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