Posted: February 22nd, 2017

. Pepsin, which speeds up the breakdown of proteins, is classified as A. a nucleic acid. B. a carbohydrate. C. an enzyme. D. a lipid.

37. Less-economically developed countries will experience higher birth rates than more-economically developed countries due to A. decreased availability of sanitary water. B. higher infant mortality rate. C. higher literacy rate of women. D. increased availability of contraceptives.

38. DNA can copy itself quite accurately while RNA cannot because only DNA is A. in double helix form . B. surrounded and supported by histone proteins. C. a polymer of nucleotides. D. confined to the nucleus.

39. Experiments cannot validate hypotheses, only falsify them. The statement above can be restated in which of the following ways? A. Until disproved, an explanation for an observation is valid. B. Certain concepts cannot be subjected to direct experimentation. C. A hypothesis that has not been falsified remains provisional. D. Proving a hypothesis exempts it from further testing.

40. A researcher collects high-resolution photographs of the Earth taken from outer space at annual intervals for the last decade. This data would be most useful to analyze which of the following? A. Human movement during crises B. Migration patterns of large whales C. Deforestation in the rainforest D. Weather patterns during hurricanes

41. Moths with a certain coloring are camouflaged in their habitat. Over time, more moths are born with this coloring. Which of the following best explains the increasing number of moths with this coloring? A. Natural selection B. Gene flow C. Genetic drift D. Sexual selection

42. Pepsin, which speeds up the breakdown of proteins, is classified as A. a nucleic acid. B. a carbohydrate. C. an enzyme. D. a lipid.