Which of the following is a product of recombinant DNA technology?
A) rice that produces vitamin A
B) bacteria that produce antibiotics
C) yeast that produces alcohol
D) bacteria that produce acetone
E) microbes that digest crude oil
A
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In mismatch repair on newly replicated DNA, enzymes distinguish between old and newly replicated DNA strands based on the fact that newly replicated DNA strands are ________-methylated relative to older DNA.
Fill in the blank(s) with the appropriate word(s).
Which of the following is true regarding a balanced polymorphism?
A. The frequency of alleles is not changing over time B. The homozygous condition for the alleles is not advantageous to the organism C. The population (or species) occupies a heterogeneous environment D. An example in humans is sickle-cell anemia E. All of the answers are correct
Kuru is a degenerative disease of the central nervous system believed to be caused by which type of agent?
A) virus B) bacterium C) prion D) viroid E) protozoan
Which white blood cells will harbor the HIV virus during the early infectious stages of AIDS?
a. Macrophages b. Helper B cells c. Mast cells d. Cytotoxic T cells e. Helper T cells