64. Animal communication involves what type of sensory information?
(A) visual
(B) auditory
(C) chemical
(D) A and C only
(E) A, B, and C

60. The recessive allele that causes phenylketonuria (PKU) is harmful, except when an infant's diet lacks the amino acid, phenylalanine. What maintains the presence of this harmful allele in a population's gene pool? (A) heterozygote advantage (B) stabilizing selection (C) diploidy (D) balancing selection (E) kin selection

61. Bagworm moth caterpillars feed on evergreens and carry a silken case or bag around with them in which they eventually pupate. Adult female bagworm moths are larval in appearance; they lack the wings and other structures of the adult male and instead retain the appearance of a caterpillar even though they are sexually mature and can lay eggs within the bag. This is a good example of (A) allometric growth. (B) paedomorphosis. (C) sympatric speciation. (D) adaptive radiation. (E) changes in homeotic genes.

62. Hypothetical mutation in a squirrel population produces organisms with eight legs rather than four. Further, these mutant squirrels survive, successfully invade new habitats, and eventually give rise to a new species. The initial event, giving rise to extra legs, would be a good example of (A) punctuated equilibrium. (B) species selection. (C) habitat selection. (D) changes in homeotic genes. (E) allometry.

63. Species that are not closely related and that do not share many anatomical similarities can still be placed together on the same phylogenetic tree by comparing their (A) plasmids. (B) chloroplast genomes. (C) mitochondrial genomes. (D) homologous genes that are poorly conserved. (E) homologous genes that are highly conserved.

65. Which of the following statements about histone acetylation is WRONG? (A) Histone acetylation usually occurs within the tail region. (B) Histone acetylation decreases the positive charge of histones. (C) Histone acetylation reduces the histone-DNA affinity. (D) Histone acetylation promotes the 30-nm fiber formation. (E) Histone acetylation is usually associated with activation of gene expression.

66. Which of the following statements is true? (A) miRNAs are made from long dsRNAs, whereas siRNAs are made from large hairpin precursors. (B) miRNAs are made from large hairpin precursors, whereas siRNAs are made from long dsRNAs. (C) Both miRNAs and siRNAs are made from long dsRNAs. (D) Both miRNAs and siRNAs are made from large hairpin precursors. (E) none of the above

67. Attaching the activation domain of Gal4 to the Tet (tetracycline) repressor creates a hybrid protein that will (A) bind to the Gal4 binding site in response to galactose. (B) bind to the Gal4 binding site in response to tetracycline. (C) bind to the tet operator in response to tetracycline. (D) bind to the tet operator in response to galactose. (E) all of the above

68. In a neuron at rest, which of the following is true? (A) Leakage of sodium ions into the neuron is greater than leakage of potassium ions out of the neuron. (B) Leakage of sodium ions out of the neuron is greater than leakage of potassium ions into the neuron. (C) Leakage of potassium ions into the neuron is greater than leakage of sodium ions out of the neuron. (D) Leakage of potassium ions out of the neuron is greater than leakage of sodium ions into the neuron. (E) Leakage of potassium ions out of the neuron is equivalent to leakage of sodium ions into the neuron.

69. Which is NOT involved in RNA editing? (A) site-specific deamination of adenines (B) site-specific deamination of cytosines (C) guide RNA-directed uridine insertion (D) guide RNA-directed uridine deletion (E) snoRNA-directed 2’-OH methylation

70. The effect of 5-Azacytosine on gene expression is to (A) prevent chromatin remodeling. (B) prevent RNA editing. (C) remove DNA methylation. (D) enhance DNA recombination. (E) remove histone acetylation.