Bacteria have 80S ribosomes each composed of a 60S large subunit and a 40s small subunit.
a. true
b. false
Ans: b. false
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Approximately what percentage of the human genome encodes proteins?
a. 1 b. 3 c. 5 d. 15 e. 50
What is the ?P of a living plant cell that has ? = ?0.2 MPa and ?S = ?0.4 MPa?
a. ?P = ?0.6 MPa b. ?P = 0.08 MPa c. ?P = ?0.2 MPa d. ?P = 0.2 MPa e. ?P = 0.5 MPa
Blood returning to the heart enters:
a. a ventricle b. the aorta c. an atrium d. a capillary bed e. all of these
Refer to the paragraph on the effects of estrogens in the environment. What is the significance of using the concentrations of 5, 25, and 100 ng/l of 17?-estradiol for the dose in this experiment?
A) These concentrations are similar to those found in many animals. B) These concentrations are found in the environment. C) These concentrations are effective, yet not lethal to the fish. D) These concentrations are standard in toxicology assays.