Helper T cells stimulate the proliferation of:
A. Cytotoxic T cells and Macrophages
B. Cytotoxic T cells and B cells
C. B cells and Macrophages
d. All of the above
Answer: B. Cytotoxic T cells and B cells
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The receptors on T cells and B cells bind to _____
A) antibodies B) antigens C) natural killer cells D) double-stranded RNA E) immunoglobulins
Humans gain the least amount of water by what route?
a. metabolism b. ingestion of liquids c. ingestion of solids d. ingestion of liquids and solids contribute an equal amount of water e. inhalation of liquids.
How does the enzyme telomerase meet the challenge of replicating the ends of linear chromosomes?
A) It adds a single cap structure that resists degradation by nucleases. B) It causes specific double-strand DNA breaks that result in blunt ends on both strands. C) It catalyzes the lengthening of telomeres, compensating for the shortening that could occur during replication without telomerase activity. D) It adds numerous GC pairs, which resist hydrolysis and maintain chromosome integrity.
Figure _________ represents meiosis II for an organism with a diploid number of 4.
A. A
B. B
C. C
D. D