The evolutionary origin of mitochondria is demonstrated by which of the following key genomic characteristics?
A) variable numbers of protein-encoding genes
B) large stretches of AT-rich DNA
C) linear and circular genome structure in different organisms
D) rRNA genes most closely related to Bacteria
Answer: D
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In plants, the light-dependent reactions require
A. ATP. B. O2. C. NADP+. D. glucose. E. Calvin cycle enzymes.
Prednisone is a glucocorticoid hormone that is sometimes prescribed to treat rheumatoid arthritis, asthma, and severe allergic reactions. If prednisone were taken for several weeks, which one of the following might occur?
A) Production of natural cortisol may decrease. B) Production of estrogen by the ovaries may decrease. C) Levels of thyroid hormone may be elevated. D) Levels of aldosterone may be elevated. E) Levels of parathyroid hormone may be decreased.
Chemoreceptors are involved with which two senses?
a. touch and olfaction b. hearing and olfaction c. gustation and touch d. gustation and vision e. gustation and olfaction
Every polypeptide chain synthesized from RNA starts with which amino acid?
a. Arginine b. Phenylalanine c. Methionine d. Leucine