62. Fossil evidence indicates that several kinds of flightless dinosaurs possessed feathers. If some of these feather-bearing dinosaurs incubated clutches of eggs in carefully constructed nests, this might be evidence supporting the claim that
(A) the earliest reptiles could fly, and the feathers of flightless dinosaurs were vestigial flight surfaces.
(B) all fossils with feathers are actually some kind of bird.
(C) the feathers were plucked from the bodies of other adults to provide nest-building materials.
(D) their feathers originally served as insulation, and only later became flight surfaces.
(E) dinosaurs were as fully endothermal (warm-blooded) as modern birds and mammals.

58. The steps below refer to various stages in transmission at a chemical synapse: 1. The synaptic vesicles release neurotransmitter into the synaptic cleft. 2. The ligand-gated ion channels open. 3. An action potential depolarizes the membrane of the axon terminal. 4. Calcium ions rush into neuron's cytoplasm. 5. Neurotransmitter binds with receptors associated with the postsynaptic membrane. Which sequence of events is CORRECT? (A) 1 → 2 → 3 → 4 → 5 (B) 3 → 4 → 1 → 5 → 2 (C) 3 → 1 → 5 → 4 → 2 (D) 4 → 3 → 1 → 2 → 5 (E) 5 → 1 → 2 → 4 → 3

59. Eukaryotic telomeres replicate differently than the rest of the chromosome. Which of the following is the cause? (A) DNA polymerase that cannot replicate the leading strand template to its 5' end. (B) The evolution of telomerase enzyme. (C) Gaps left at the 3' end of the lagging strand because of the need for a 5' onto which nucleotides can attach. (D) Gaps left at the 3' end of the lagging strand because of the need for a primer. (E) Gaps left at the 5' end of the lagging strand because of the need for a 3' onto which nucleotides can attach. 

60. The same gene that causes various coat patterns in wild and domesticated cats also causes the cross-eyed condition in these cats, the cross-eyed condition being slightly maladaptive. In a hypothetical environment, the coat pattern that is associated with crossed eyes is highly adaptive, with the result that both the coat pattern and the cross-eyed condition increase in a feline population over time. Which statement is supported by these observations? (A) Natural selection reduces the frequency of maladaptive genes in populations over the course of time. (B) Polygenic inheritance is generally maladaptive, and should become less common in future generations. (C) Phenotype is often the result of compromise. (D) In all environments, coat pattern is a more important survival factor than is eye-muscle tone. (E) Evolution is progressive and tends toward a more perfect population.

61. What is thought to be the correct sequence of these events, from earliest to most recent, in the evolution of life on Earth? 1. origin of mitochondria. 2. origin of chloroplasts. 3. origin of multicellular eukaryotes. 4. origin of cyanobacteria. 5. origin of fungal-plant symbioses. (A) 4, 3, 2, 1, 5 (B) 4, 2, 1, 3, 5 (C) 4, 2, 3, 1, 5 (D) 4, 1, 2, 3, 5 (E) 4, 1, 3, 2, 5

63. Typically as cells grow, their increase in volume outpaces their increase in surface area, and continued survival requires undergoing asexual reproduction to reestablish a healthy surface area to volume ratio. Thus, which of these is LEAST likely to contribute to the ability of a single-celled foraminiferan to grow to a diameter of several centimeters? (A) Its calcium carbonate test contributes extra mass. (B) Its symbiotic algae provide glucose to the cytoplasm. (C) Its symbiotic algae absorb metabolic waste products from the cytoplasm. (D) Its symbiotic algae provide oxygen to the cytoplasm. (E) Its threadlike pseudopods dramatically increase its surface area to volume ratio.

64. Beginning with the germination of a moss spore, what is the sequence of structures that develop after germination? 1. embryo 2. sporophyte 3. gametes 4. protonema 5. gametophore (A) 4 → 3 → 5 → 2 → 1 (B) 4 →1 → 3 → 5 → 2 (C) 4 → 5 → 2 → 1 → 3 (D) 4→ 5 → 3 → 1 → 2 (E) 4 → 5 → 1 → 2 → 3

65. Arrange the following structures, which can be found on male pine trees, from the largest structure to the smallest structure (or from most inclusive to least inclusive). 1. sporophyte 2. microsporangia 3. microspores 4. pollen cone 5. pollen nuclei (A) 1, 4, 3, 2, 5 (B) 1, 4, 2, 3, 5 (C) 1, 2, 3, 5, 4 (D) 4, 3, 2, 1, 5 (E) 1, 4, 2, 5, 3

66. How does the fass mutation in Arabidopsis result in a stubby plant rather than a normal elongated one? (A) Meristem identity genes produce defective transcription factors, resulting in a stubby shoot. (B) Juvenile nodes retain their juvenile status and elongated cells do not develop. (C) The cell's pattern of migration in the apical meristem is disrupted. (D) Lack of formation of the preprophase band results in random planes of cell division. (E) Cellulose microfibrils in the cell wall do not form, resulting in a shorter plant.

67. Mitochondrial DNA is primarily involved in coding for proteins needed for electron transport. Therefore in which body systems would you expect most mitochondrial gene mutations to be exhibited? (A) Circulation. (B) The skin and senses. (C) Nervous and muscular systems. (D) Excretory and respiratory systems. (E) The immune system and the blood.

68. Blood carbon dioxide levels determine the pH of other body fluids as well as blood, including the pH of cerebrospinal fluid. How does this enable the organism to control breathing? (A) The brain alters the pH of the cerebrospinal fluid to force the animal to retain more or less carbon dioxide. (B) The medulla is able to control the concentration of bicarbonate ions in the blood. (C) The brain directly measures and monitors carbon dioxide and causes breathing changes accordingly. (D) Stretch receptors in the lungs cause the medulla to speed up or slow breathing. (E) The medulla, which is in contact with cerebrospinal fluid, monitors pH and uses this measure to control breathing