The first genetic material on Earth was probably _____
A) DNA produced by reverse transcriptase from abiotically produced RNA
B) DNA molecules whose information was transcribed to RNA and later translated in polypeptides
C) self-replicating RNA molecules
D) oligopeptides located within protobionts
C
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Which of these methods can be used to determine the number of viable microorganisms in a sample?
A. Light scattering in a spectrophotometer B. Counting a known volume of cells in a hemocytometer C. Measuring colony forming units per ml D. Measuring total cell mass
Compact bone is indicated by
a. A. b. B. c. C. d. D. e. E.
Streptomycetes degrade a variety of organic compounds and are, therefore, important in mineralization processes in the environment.
Answer the following statement true (T) or false (F)
Sodium concentration in the urine will be maintained due to the loop of the nephron (loop of Henle) exhibiting
Select one: a. an active release of sodium from the descending limb. b. a passive and active release of sodium from the ascending limb. c. a passive release of sodium from the descending limb. d. the release of water from the ascending limb. e. the active transport of water.