E. coli contains about _______ different tRNAs that code for _______ different amino acids.
a. 62; 40
b. 62; 20
c. 50; 20
d. 40; 20
Ans: d. 40; 20
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Pseudomonads are aerobic, gram-positive, polar flagellated, bacillus-shaped cells
Indicate whether the statement is true or false.
The division of microbes termed the Firmicutes have a cell wall type best described as ________.
A. gram-negative B. gram-positive C. archaeal D. lacking a cell wall
Which of the following statements accurately reflects the process of glycolysis?
A. Glycolysis uses molecular oxygen; however, it occurs in anaerobic environments. B. Glycolysis uses no molecular oxygen; however, it can occur in aerobic environments. C. Glycolysis uses no molecular oxygen and occurs in the mitochondria. D. Glycolysis uses molecular oxygen and occurs in aerobic environments.
The operation of natural selection depends upon the
fact that a. the strong always survive, whereas the weak always die. b. some individuals have a better chance to produce more offspring. c. mutations are always harmful. d. acquired characteristics are inherited. e. reproduction of all members of a species is virtually the same.