Normally, a gamete gets only one of a pair of alleles. This is true because of
A. crossing-over.
B. independent assortment.
C. fertilization.
D. segregation.
D. segregation.
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Sulfonamides inhibit the production of folic acid and, therefore, inhibit the synthesis of ________.
A. peptidoglycan B. aromatic amino acids C. purines and pyrimidines D. ribose
Antigen presentation by MHC class 1 proteins is a signal for:
A. secretion of antibodies by B cells. B. attack by cytotoxic T cells. C. activation of cytotoxic T cells by helper T cells. D. cytokine release by helper T cells.
How are the cells of a multicellular animal connected to the external environment? Briefly describe how nutrients and wastes are transferred from these cells to the external environment.
What will be an ideal response?
The virulence factor associated with the events of gram-negative sepsis and septic shock is
What will be an ideal response?