Clonal selection occurs when
A) daughter cells differentiate into memory B cells and plasma cells.
B) antigen-antibody binding causes selected B cells to multiply.
C) natural selection favors specific white blood cells and they multiply rapidly.
D) antibodies that are the most common become cloned.
E) scientists clone antibodies for specific diseases and use them to prepare vaccines.
B
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Four of the five glands listed below belong to the
endocrine system. Select the exception. a. thymus b. salivary c. parathyroid d. thyroid e. pituitary
In comparison to rocky coasts, intertidal organisms living on sandy or muddy beaches
A) experience greater variability in salinity. B) experience greater variability in temperature. C) are more likely to be attached to the substrate. D) are more likely to move back and forth with the tides.
Axonemal dyneins are
A) associated with organelle movement. B) associated with cilia and flagella. C) monomeric myosin-like proteins. D) responsible for axonal anterograde transport. E) All of the above are correct.
Ammonium is converted to nitrates (NO3-) by this process
A) nitrification B) nitrogen fixation C) nitrofaction D) calcification