In a vertebrate with a four-chambered heart, the structure(s) containing blood with the highest O2 concentration is/are the _______________.
A. pulmonary arteries
B. pulmonary veins
C. right atrium
D. inferior vena cava
E. right ventricle
B. pulmonary veins
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The group of bacteria that can be described as being normal inhabitants of soil and water and primarily responsible for the decomposition of plant material is:
a. Rhodococcus. b. Nocardia. c. Gordonia. d. Tsukamurella.
MAPK and MEK are intracellular signaling proteins that mediate cell division induced by growth factors. When mutations in the normal MAPK and MEK genes result in an abnormally high level of MAPK and MEK activity and an increased rate of cell division, then the mutated gene is called a(n)
A. spliceosome. B. transposon. C. tumor-suppressor gene. D. oncogene. E. None of the choices are correct.
Harry Noller's experiments in which he extracted the ribosomal proteins and found that RNA molecules could catalyze
protein synthesis had one major flaw. What was the flaw?
a. the extraction process may have altered the RNA molecules b. protein synthesis may have occurred prior to extraction c. coenzymes, which were not extracted, might have been responsible for the reaction d. the extraction process may have altered the pH of the environment e. undetectable amounts of protein may have remained
Beaches with heavy wave action tend to have finer sand particles and are flat
Indicate whether the statement is true or false