63. Of the plant hormones, which one most directly stimulates cell division and delays senescence?
(A) auxin
(B) ethylene
(C) cytokinin
(D) gibberellin
(E) abscisic acid

59. Which of the following statements is a correct distinction between autotrophs and heterotrophs? (A) Only heterotrophs need to acquire chemical compounds from the environment. (B) Cellular respiration is unique to heterotrophs. (C) Only heterotrophs have mitochondria. (D) Autotrophs, but not heterotrophs, can nourish themselves beginning with nutrients that are entirely inorganic. (E) Only heterotrophs require oxygen.

60. A _ _ is a membrane-enclosed bag of hydrolytic enzymes that the cell uses to digest macromolecules. (A) lysosome (B) ribosome (C) macrosome (D) hydrosome (E) peroxisome

61. Which of the following pieces of evidence most directly contradicted the hypothesis that viruses were some kind of cell? (A) Organisms could develop immunity to virus. (B) Viruses could pass through fine filters. (C) Viruses can form crystals. (D) Viruses contain proteins. (E) Viruses cause disease.

62. Nitrogen fixation involves the conversion of gaseous nitrogen to (A) ammonia. (B) nitrite. (C) nitrate. (D) amine. (E) amino acid.

64. Eukaryotic promoters usually have a nucleotide sequence about 25 nucleotides upstream from the transcriptional start point. The nucleotide sequence is called (A) ATAT box. (B) TATA box. (C) promoter sequence. (D) TAATTAT sequence. (E) Shine-Dalgarno sequence.

65. What part of the brain affects the emotional aspects of behaviors？ (A) reticular activating system (B) limbic system (C) parasympathetic system (D) peripheral nervous system (E) cerebellum

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