63. In the presence of an antibiotic prokaryotic translation can initiate, but only dipeptides that remain bound to the ribosome are formed. This antibiotic appears to block
(A) binding of fMet-tRNA_i to P site.
(B) binding of aminoacyl-tRNA to A site.
(C) peptide bond formation.
(D) translocation.
(E) termination.

59. Which of the following statements about endocrine system is false? (A) Hormones from the adrenal cortex control salt and water balance. (B) An increase in endorphins blocks pain. (C) An iodine deficiency might interfere with the production of thyroxine. (D) Some cells can conduct nerve signals and secrete hormones. (E) Most endocrine glands produce steroid hormones.

60. If two modern organisms are distantly related in an evolutionary sense, then one should expect that (A) they should live in very different habitats. (B) their chromosomes should be very similar. (C) they shares a common ancestor relatively recently. (D) they should share fewer homologous organs than two closely related organisms. (E) they should be members of the same genus.

61. How do cleavage divisions differ from normal mitotic cell divisions? (A) Cleavage divisions occur by meiosis, not mitosis. (B) Cleavage divisions are slower than normal cell divisions. (C) Cleavage divisions occur without much mRNA synthesis. (D) Cleavage divisions divide cells into daughters with different gene sets. (E) Both C and D are correct.

62. The endoplasmic reticulum and Golgi apparatus are very similar among the groups of alga-like protists, but chloroplasts differ significantly and appear to be related to different prokaryotes. These facts imply that (A) The Golgi apparatus evolved before the endomembrane system. (B) Chloroplasts evolved before the endoplasmic reticulum. (C) Endomembrane systems evolved before chloroplasts. (D) Endomembrane systems evolved from symbiotic prokaryotes. (E) Both C and D are correct.

64. According to the wobble rules, a tRNA with the anticodon 5'-GAU-3' can recognize the codons (A) 5'-CUA-3' and 5'-UUA-3'. (B) 5'-CUA-3' and 5'-CUG-3'. (C) 5'-AUC-3' and 5'-GUC-3'. (D) 5'-AUC-3' and 5'-AUU-3'. (E) 5'-IUC-3'.

65. Cephalization is generally associated with all of the following except (A) bilateral symmetry. (B) a brain. (C) a longitudinal nerve cord. (D) a sessile existence. (E) concentration of sensory structures at the anterior end.

1. Light of wavelength 680 nm falls on two slits and produces an interference pattern in which the fourth-order fringe is 38 mm from the central fringe on a screen 2.0 m away. What is the separation of the two slits? (A) 1.4×10−4m (B) 2.1×10−4m (C) 2.8×10−4m (D) 4.2×10−4m (E) 5.6×10−4m

2. A long solenoid of 500 turns carrying a current of 3.8 A produces within itself a uniform magnetic flux of 2.0 mWb. What is the self-inductance of the coil? (A) 0.13 H (B) 0.26 H (C) 0.36 H (D) 0.46 H (E) 0.52 H

3. In a sinusoidal-ac circuit, the current is I=I0sin(ωt +θ) . What is the rms(root-mean-square) current ? (A) I0 /π (B) I0 /1.414 (C) I0 /0.707 (D)πI0 (E) 2πI0

4. A cylinder of mass 10.0 kg rolls without slipping on a horizontal surface. At the instant when its center of mass has a speed of 10.0 m/s, what is the cylinder’s total energy? (A) 200 J (B) 250 J (C) 500 J (D) 750 J (E) 1000 J