Proto-oncogenes (select all correct choices):
A. are mutated constituents of cell division
signaling proteins that are hyperactive.
B. can be mutated by cigarette smoke to
become triggers for cancer.
C. can be abnormal growth factors, cell
surface receptors, or members of a signal
transduction pathway.
D. promote cell division.
B,D
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What will be an ideal response?
The primary cells of the immune response are the T and B cells. T and B cells are types of:
A. natural killer cells B. antigens C. phagocytes D. lymphocytes
Buffering systems work to maintain pH within normal limits by:
A) adding hydrogen ions when conditions becomes too acidic. B) adding hydrogen ions when conditions become too acidic and removing hydrogen ions when conditions become too basic. C) removing hydrogen ions when conditions become too acidic and adding hydrogen ions when conditions become too basic. D) adding hydroxide ions when conditions become too basic.
Which of the following is the indigestible (at least for humans) glucose polysaccharide that is found in plants?
A) starch B) chitin C) glycogen D) cellulose