If a foreign gene is cloned into an expression host, it is important that the host itself
A) not produce the protein being studied.
B) produce the protein in larger amounts than the vector.
C) repress the genetic expression being studied.
D) produce signal proteins to tag the host protein.
Answer: A
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If the allele frequency of the dominant allele is 0.4, what value is used for the term p2 in the equation p2 + 2pq + q2 = 1?
A. 0.4 B. 0.2 C. 0.16 D. 16
Why must T cell activation take place outside the thymus?
A. An activated T cell could destroy the other maturing T cells. B. An activated T cell could then destroy the thymus gland itself. C. Many T cells are self-reactive and must be eliminated in the thymus before any possibility of activation. D. Other cell types might be accidentally activated in the thymus.
The cause of schistosomiasis is a ___
a. fluke b. tapeworm c. planarian d. leech e. roundworm
The main problem for sufferers of cystic fibrosis is
A. abnormal hemoglobin. D. missing DNA repair enzymes. B. elevated levels of cholesterol. E. formation of cysts in kidneys. C. mucus blocking ducts of glands.