35. Which of the following does not tend to promote speciation?
(A) The founder effect
(B) Gene flow
(C) Natural selection
(D) Polyploidy
(E) Disruptive selection

31. Phenylketonuria is an autosomal recessive inheritable disease. If the incidence of the disease is about 1/10000, what is the frequency of the phenylketonuria recessive disease allele (a) and the (Aa) genotype frequency of the person carrying the recessive gene in the population? (A) 0.1% and 0.99% (B) 0.1% and 1.98% (C) 1% and 3.96% (D) 1% and 1.98% (E) 0.1% and 3.198%

複選題32. Which of the following features belong to the coral? 1. a gastrovascular cavity 2. a polyp stage 3. a medusa stage 4. cnidocytes 5. a pseudocoelom (A) 1 and 4 (B) 2 and 3 (C) 2, 3, and 4 (D) 1, 2, 3, and 4 (E) all five of these

33. What is the correct sequence of the following steps during the human excretory system? (A) excretion → filtration → secretion → reabsorption (B) filtration → reabsorption → secretion → excretion (C) excretion → filtration → reabsorption → secretion (D) excretion → filtration → secretion (E) filtration → excretion → reabsorption → secretion

34. In which of the following conditions, asexual reproduction results in greater reproductive success than does sexual reproduction? (A) When pathogens are rapidly diversifying. (B) When a species has accumulated numerous deleterious mutations. (C) When there is some potential for rapid overpopulation. (D) When a species is expanding into diverse geographic settings. (E) When a species is in stable and favorable environments.

36. What is the response a plant would react to an attack from herbivores? (A) Leaf abscission to prevent further loss of tissue. (B) Early flowering to reproduce before being eaten. (C) Production of chemical compounds for defense or to attract predators of the herbivores. (D) Production of physical defenses, such as thorns. (E) Production of thicker bark and cuticle to make it more difficult to eat.

37. A healthy young man ingests a large volume of distilled water and 50 min later a study is undertaken. In which of the following parts in his kidneys would the liquid with the greatest osmolarity be found? (A) Proximal tubule (B) The bottom of the loop of Henle of the cortical nephron (C) The bottom of the loop of Henle of the juxtamedullary nephron (D) Distal tubule of the juxtamedullary nephron (E) The innermost medullary collecting duct

38. Which of following statements about human digestive function is incorrect? (A) When food bolus enters the stomach, gastrin is secreted into the gastric lumen. (B) Secretin released from duodenum inhibits the secretion of gastric juice. (C) CCK released from duodenum stimulates the secretion of pancreatic enzymes. (D) The vagus nerve activates the parietal cells of stomach when a bite of food enters the mouth. (E) Increased sympathetic activity would slow down the motility of digestive tract.

39. Which of the following statements about human respiration is true? (A) Most of the carbon dioxide in the blood is bound to hemoglobin. (B) Increased pH level decreases affinity of hemoglobin for O2 and improves the unloading reaction. (C) At normal systemic venous PO2, about 25% of the hemoglobin is in the form of oxyhemoglobin. (D) Surfactants can increase the surface tension of the lungs. (E) During an unforced exhalation, alveolar pressure is greater than atmospheric pressure.

40. Which event occurs after the first heart sound and before the second heart sound in human cardiac cycle? (A) Ventricular relaxation (B) Aortic systolic pressure (C) AV valves open (D) P wave of the ECG (E) Blood volume in ventricle increases

41. In a neuroscience lab, a student increased the concentration of K+ outside a neuron from 5 mM to 10 mM, while maintaining other ion concentrations as they were. What would happen to the neuron’s membrane potential? (A) The membrane potential would become more negative. (B) The membrane potential would become less negative. (C) The membrane potential would remain the same. (D) The membrane potential would be closer to the K+ equilibrium potential. (E) There would be no potential difference across the membrane.