Because more than one codon can specify the same amino acid, the genetic code is said to be
A. repetitive.
B. redundant.
C. reverse.
D. degenerate.
E. wobbly.
D. degenerate.
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Some green algae exhibit alternation of generations. All land plants exhibit alternation of generations
No charophytes (stoneworts) exhibit alternation of generations. Keeping in mind the recent evidence from molecular systematics, the correct interpretation of these observations is that _____. A) charophytes are not related to either green algae or land plants B) plants evolved alternation of generations independently of charophytes C) alternation of generations cannot be beneficial to charophytes D) land plants evolved directly from the green algae that perform alternation of generations E) scientists have no evidence to indicate whether or not land plants evolved from any kind of alga
When Hershey and Chase labeled viruses with radioactive phosphorus, they concluded that the virus injects DNA and
not protein into its host because ____.
a. most of the radioactive protein was inside the bacteria b. most of the radioactive DNA was inside the bacteria c. both radioactive DNA and protein were inside the bacteria d. neither radioactive DNA nor protein were inside the bacteria e. entire viruses were inside the bacteria
Which one of the following types of T cells is a critical component of the immune system because it stimulates and enhances the activity of other components of the immune system?
A) T suppressor cell B) T memory cell C) T helper cell D) cytotoxic T cell E) natural killer cells
What are the three main (abdominal) accessory organs of the human digestive system?
A) liver B) large intestine C) gallbladder D)pancreas E) esophagus