37. Which one of the following hormones regulates cell division in plants?
(A)auxin (IAA)
(B)ethylene
(C) gibberellins
(D) cytokinins

38. Shoots that grow vertically toward the sun can be characterized as _____. (A)positive for phototropism and negative for gravitropism (B)neutral for phototropism and positive for gravitropism (C) negative for phototropism and positive for gravitropism (D) positive for phototropism and neutral for gravitropism

39. Connective tissues typically have _____.(A)little space between the membranes of adjacent cells (B)the ability to transmit electrochemical impulses (C) the ability to shorten upon stimulation (D) relatively few cells and a large amount of extracellular matrix

40. The metabolic breakdown of specialized brown fat deposits in certain animals is substantially increased during _____. (A)acclimatization (B)torpor (C) nonshivering thermogenesis (D) shivering thermogenesis

41. A zoologist analyzes the jawbones of an extinct mammal and concludes that it was an herbivore. The zoologist most likely came to this conclusion based upon the _____. (A)position of muscle attachment sites (B)shape of the teeth (C) size of the mouth opening (D) angle of the teeth in the mouth

42. An oil-water mixture works as an insecticidal spray against mosquitoes and other insects because it _____. (A)blocks the openings into the tracheal system (B)interferes with gas exchange across the capillaries (C) clogs their bronchi (D) prevents gases from leaving the atmosphere

43. Naturally acquired passive immunity can result from the _____. (A)injection of vaccine (B)ingestion of interferon (C) placental transfer of antibodies (D) absorption of pathogens through mucous membranes

44. Compared to wetland mammals, water conservation in mammals of arid regions is enhanced by having more _____. (A)juxtamedullary nephrons (B)urinary bladders (C) ureters (D) podocytes

45. Tadpoles must undergo a major metamorphosis to become frogs. This change includes reabsorption of the tail, growth of limbs, calcification of the skeleton, increase in rhodopsin in the eye, development of lungs, change in hemoglobin structure, and reformation of the gut from the long gut of an herbivore to the short gut of a carnivore. Amazingly, all of these changes are induced by thyroxine. What is the most likely explanation for such a wide array of effects of thyroxine? (A)There are many different forms of thyroxine, each specific to a different tissue. (B)Different tissues have thyroxine receptors that activate different signal transduction pathways. (C) Some tissues have membrane receptors for thyroxine, while other tissues have thyroxine receptors within the nucleus. (D) Different releasing hormones release thyroxine to different tissues.

46. You decide to study two species of birds, both of which form monogamous pairs (one male and one female). In species 1, you find that the eggs in a pair's nest are in fact almost always the offspring of that pair. In species 2, you are surprised to find that many of the eggs in a nest were actually fathered by males of neighboring pairs. Apparently, mating outside of monogamous pairings is widespread in species 2. What would you expect to observe if you examined the reproductive tracts of the female birds in the species? (A) Females of species 2 would have sperm from multiple males in their reproductive tracts. (B) Females of species 1 would have sperm from multiple males in their reproductive tracts, but would only use their partners' sperm to fertilize eggs. (C) Ovaries of species 1 are larger than those of species 2. (D) Females of species 1 would produce more oocytes.

47. In some rare salamander species, all individuals are females. Reproduction relies on those females having access to sperm from males of another species. However, the resulting embryos receive no genetic contribution from the males. Why do you think sperm are necessary for reproduction? (A) The sperm allow morphogenesis to proceed. (B) Sperm trigger egg activation. (C) Cell differentiation is initiated by the sperm. (D) Sperm are necessary to produce a diploid zygote.

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