B cells and T cells that react with self-antigens are destroyed by
a. apoptosis.
b. phagocytosis.
c. cytokinesis.
d. diakinesis.
e. endocytosis.
A
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DNA that contains actively transcribed genes would most likely contain chromatin in the closed configuration
Indicate whether the statement is true or false
Cells with gap junctions are typical of tissues
a. that suffer wear, abrasion, and mechanical insults. b. such as bone and cartilage that must withstand external forces. c. that require rapid exchange of chemical messages, as is the case for cardiac muscle. d. that secrete enzymes or hormones. e. described by all of these.
A phenomenon known as ________ [one or two words] occurs under conditions where a strong selection pressure acts on a particular change in an amino acid, which results in the corresponding increase in frequency of a closely linked neutral (or even
mildly deleterious) mutation. Fill in the blank(s) with correct word
One sign of yellow fever is that the whites of the eyes and the skin gain a yellowish tint. Given just this information, you can surmise that the cells of which organ are most likely being destroyed?
A) eyes B) liver C) stomach D) pancreas