During the Ames test, his? bacteria are exposed to a chemical. If the bacteria remains his+, then what can we say about the chemical?
A) The chemical is certainly a cancer-causing chemical.
B) The chemical is not safe to consume because it is likely a mutagen.
C) The chemical is safe to consume even though it is likely a mutagen.
D) The chemical is safe to consume and is not likely a mutagen.
E) The chemical is not safe to consume even though it is not likely a mutagen.
Answer: B
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A type of horizontal gene transfer in prokaryotes, in which a cell receives bacterial DNA from a bacteriophage, is
A. fixation. B. transformation. C. replication. D. transduction. E. conjugation.
Chief cells secrete:a
trypsin. b. bile. c. pepsin. d. pepsinogen. e. hydrochloric acid
If there are 20 centromeres in a cell at anaphase, how many chromosomes are there in each daughter cell following cytokinesis?
A) 10 B) 20 C) 40 D) 80
Answer the following statements true (T) or false (F)
1. The development of hypertension in humans is associated with obesity, smoking, age, and kidney disease. 2. In an open circulatory system, there is no difference between blood and interstitial fluid. 3. Relative to closed circulatory systems, Open Circulatory Systems pump hemolymph at relatively high pressure. 4. Blood is typically delivered to respiratory structures at low pressures in closed circulatory systems.