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B the cells will grow until excessive tryptophan

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Unformatted text preview: w until excessive tryptophan arrests the expression of the operon. (C) The cells will not grow until enough tryptophan has been synthesized to activate the corepressor. (D) The cells will never grow unless tryptophan is added to the medium. (E) The cells will not grow even when tryptophan is added to the medium. 41. Which of the following is LEAST likely to cause a proto-oncogene to become an oncogene? (A) A gene is incorporated into a retroviral genome. (B) A gene is expressed at an inappropriate time. (C) A gene is moved close to an enhancer, causing excess product to be made. (D) A gene is truncated, yielding a protein with modified activity. (E) A gene is moved into centromeric heterochromatin, silencing its transcription. 42. The physiological role of restriction endonucleases is to (A) allow the in vitro construction of recombinant DNA molecules (B) methylate host DNA (C) remove RNA primer during DNA synthesis (D) allow mapping of gene location (E) cleave foreign DNA molecules that enter the cell Type I: slow, oxidative, red Type II A: fast, oxidative, red Type II B: fast, glycolytic, white 43. The muscle cells listed above will most likely fatigue in what order, from first to last? First (A) (B) (C) (D) (E) Last Type I Type II A Type II B Type I Type II B Type II A Type II A Type I Type II B Type II B Type II A Type I All three types will fatigue at the same rate. 44. Members of which of the following terrestrial groups have the most water-permeable body covering? (A) (B) (C) (D) (E) Insecta Reptilia Aves Arachnida Amphibia 45. Which of the following is found in mammals during male gamete formation? (A) Two successive centrosome duplications during meiosis (B) Accumulation of yolk during gamete formation (C) Generation of a polar body during meiosis I (D) Formation of four functional gametes from a primary germ cell (E) Temporary arrest of meiosis at the metaphase I stage GO ON TO THE NEXT PAGE. Unauthorized copying or reuse of any part of this page is illegal. 21 46. During the evolution of life on Earth, the photosynthetic organisms initially responsible for raising atmospheric oxygen concentrations from less than 1 percent to about 20 percent were (A) (B) (C) (D) (E) cyanobacteria archaea diatoms flowering plants mosses 47. Which of the following statements about circadian rhythms is correct? (A) (B) (C) (D) (E) They are expressed during cell division only. They occur only in mammals. They are not found in humans. They are generated exogenously. They have a periodicity of about 24 hours. 50. Chickadees were given an opportunity to store seeds in 72 possible storage sites consisting of holes drilled in small trees that had been placed in an aviary. Typically, the seeds were placed in only 4 or 5 storage sites. The chickadees were then removed from the aviary, the seeds removed from the storage sites, and each hole covered. A day later, the chickadees were returned to the aviary and they spent nearly 5 times as long pulling at the covers on storage sites than at the covers on sites where they had not stored food. This experiment indicates that...
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This document was uploaded on 03/16/2014 for the course BIO 1434 at UT Arlington.

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