53. Which of the following statements about photosynthesis is TRUE?
(A) The light reaction in the thylakoids makes NADP⁺ to the Calvin cycle .
(B) Phosphoenolpyruvate (PEP) carboxylase has a higher affinity for CO₂ than rubisco does.
(C) The oxygen is produced by the electron transfer system of photosystem I (PS I).
(D) Photosystem II (PS II) is called P700 because of its reaction-center chlorophyll that absorbs light with a wavelength of 700 nm.
(E) C4 plants only use rubisco for carbon fixation.

49. Which gene might be associated with the rapid appearance of a vast array of bilaterally symmetrical and structurally diverse animals during the Cambrian explosion? (A) BRCA genes (B) Ubx genes (C) Opsin genes (D) STX16 genes (E) Hox genes

50. Assuming that 40 leopard cats, weighing 5 kg each and feeding solely on herbivorous prey, live continuously with their prey in a given area, approximately how much total biomass of plant material would be required? (A) 2,222 kg (B) 4,000 kg (C) 20,000 kg (D) 125,000 kg (E) 500,000 kg

51. Which of the following statements about all cells is NOT true? (A) They have membrane transport proteins. (B) They synthesize proteins on the ribosome. (C) They replicate their genome by DNA polymerization. (D) They transcribe their genetic information by RNA polymerization. (E) They use RNA as a template for genomic DNA polymerization.

52. Which is NOT included in the key features of the angiosperm life cycle of plants? (A) Development of embryo sacs (B) Development of male gametophytes (C) Fruits (D) Zygosporangium (E) Double fertilization

54. Which of the following statements about viruses is TRUE? (A) Prions replicate using host's translation machinery. (B) Reverse transcriptase in retroviruses converts host cell RNA into viral DNA. (C) A phage that reproduces only by the lytic cycle is called a temperate phage. (D) Human immunodeficiency virus (HIV) are double-stranded DNA virus. (E) Herpesvirus has single stranded RNA that acts as a template for DNA synthesis.

55. About the ABC hypothesis of flowering, which set(s) of organ and gene expression is NOT true? (A) Sepals – A gene activity (B) Petals – A + B gene activity (C) Loss of A gene results in mutation of sepals and petals (D) Carpels – C gene activity (E) Stamens – A + C gene activity

56. What would account for increased urine production as a result of drinking alcoholic beverages? (A) Increased aldosterone production (B) Increased blood pressure (C) Inhibition of antidiuretic hormone secretion (ADH) (D) Increased reabsorption of water in the proximal tubule (E) The osmoregulator cells of the brain increasing their activity

57. Which of the following statements about transport in vascular plants is TRUE? (A) The apoplast consists of everything internal to the plasma membranes of living cells. (B) The symplastic route for water and solutes is from outside cells through cell walls and extracellular spaces. (C) When K+ leaves the guard cells, stomata becomes open. (D) Na+ is typically cotransported rather than H+ for transport of sucrose in plant cells. (E) The movement of fluid in phloem is multidirectional in plants.

58. When an individual is subject to short-term starvation, most available food is used to provide energy (metabolism) rather than building blocks (growth and repair). Which hormone would be particularly active during food shortage? (A) Epinephrine (B) Glucagon (C) Oxytocin (D) Antidiuretic hormone (E) Insulin

59. The observation that the acetylcholine released into the junction between a motor neuron and a skeletal muscle binds to a sodium channel and opens it is an example of ______. (A) a voltage-gated sodium channel (B) a voltage-gated potassium channel (C) a ligand-gated sodium channel (D) a second-messenger-gated sodium channel (E) a chemical that inhibits action potential