The infinite variety of antibodies that can be generated by B cells is due to:
a. the infinite variety of genes in these cells
b. the use of gene segments to produce an infinite variety of proteins
c. the recombination of genes due to crossing over
d. random mutations
e. modifying the protein after an antigen is detected
b
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A frog loses its ability to undergo buccal pumping. What must happen to compensate for this loss?
A. The pumping of blood from the atria to the ventricle must increase. B. The exchange of gases through the skin must increase. C. The pumping of blood from the ventricle to the body must increase. D. The diffusion of wastes through the kidneys must increase. E. The pumping of blood from the ventricle to the atria must increase.
When humans manipulate the genes of microorganisms, the process is called ________.
A. epidemiology B. genetic engineering C. immunology D. bioremediation E. taxonomy
In a signal transduction pathway involving phospholipid products as second messengers, after a G
protein is activated, the activated G protein then activates:a. IP2. b. IP3. c. protein kinase C. d. phospholipase C. e. adenylyl cyclase.
Sketch and label a cross-section through the human skin. Describe two differences that would occur if the skin were
exposed to UV radiation. What will be an ideal response?