A neutral mutation is a mutation that _____ increase the reproductive fitness of an organism
A. does
B. does not
B
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How are RNA hairpin turns related to termination in E. coli?
A) The turns are formed from complementary base pairing and cause separation of the RNA transcript and RNA polymerase. B) A three-base repeat signals a stop sequence, and the RNA transcript is released. C) Release factors bind to sites on the hairpin turn, causing release of the RNA transcript. D) The hairpin turn prevents more nucleoside triphosphates from entering the active site of the enzymes, effectively shutting off the process of polymerization.
Homing endonucleases:
A. are encoded by sequences in the exons of genes. B. cleave specific sequences in the target gene to which the intron is moving. C. have cleavage sites that are common in the genome. D. make single-strand breaks. E. All of the choices given make true statements.
Select the TRUE statement(s) about respiratory diseases. (Select all that apply.)
a. Severe mountain sickness can cause pulmonary edema. b. Smoking often damages alveolar walls, making oxygen delivery difficult or impossible. c. At high altitudes, humans adapt by enlarging the lungs and increasing the number of alveoli. d. Severe mountain sickness causes pulmonary edema due to high pressures in the pulmonary artery, induced by hypoxia and the sympathetic nervous system.
A frequent cancer that is seen in AIDS patients is
A. leukemia. B. melanoma. C. Kaposi's sarcoma. D. Hodgkin's lymphoma. E. colon cancer.