Rates of cell production and cell death are approximately equal during the ________ phase of growth.
A. lag
B. log
C. death
D. stationary
E. intermediate
Answer: D
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Identify the signals necessary for maturation and activation of a B cell by a T-dependent antigen.
A. Antigen is internalized and presented by a dendritic cell. B. B-cell growth factors secreted by TH2 cells mature and activate the antigen-stimulated B cell. C. Antigen binds to a B-cell receptor. D. B cell secretes cytokines to activate a T helper cell.
The sucker of clingfishes is modified from:
a. the mouth. b. the pectoral fins. c. a disc on top of the head. d. the pelvic fins. e. the first dorsal fin.
An example of a nonbiological factor that affects community structure is ____
a. mutualism b. competition c. parasitism d. predation e. rainfall
What is the function of NADH and FADH2 in cellular respiration?
a. They help break down glucose b. They carry electrons to the electron transport chain c. They oxidize pyruvate d. They produce ATP e. They assist in making acetyl groups