An important indicator of evolutionary relatedness is to determine:
a. size of the periplasmic space
b. similarities of cell membrane proteins
c. size of the bacterial chromosome
d. nitrogen base sequence of rRNA
e. size of the ribosomes
Answer: d. nitrogen base sequence of rRNA
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Which of the following elements is considered an essential macronutrient for plants?
a. gold b. manganese c. calcium d. nitrogen e. copper
Glycolysis depends upon a continuous supply of
a. NADP. b. pyruvate. c. glucose. d. NADH. e. H2O.
Plant cells
A) lack mitochondria and chloroplasts. B) lack mitochondria but have chloroplasts. C) have mitochondria but do not have chloroplasts. D) have mitochondria and chloroplasts.
Which of the following nonspecific mediators inhibits virus replication and cellular division while increasing some lymphocyte action?
A. chemokines B. TNF C. IFN D. IL-6 E. IL-1