Each skeletal muscle cell constitutes a single
A. motor unit.
B. muscle fiber.
C. sarcolemma.
D. myofibril.
E. sarcomere.
B. muscle fiber.
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Abiotic interactions are
A. between organisms. B. between organisms and the environment. C. usually mutually costly. D. most important in tropical ecosystems. E. rare.
The BRCA2 protein functions in double-strand break repair. If a woman is heterozygous for a loss-of-function allele of BRCA2, she
A) will develop cancer because two functional copies of BRCA2 are needed in every cell. B) will not get cancer because BRCA1 can compensate for the loss of BRCA2. C) will develop cancer after several mutations occur, even if the mutations occur in different clonal populations of cells. D) may develop cancer because mutation of the wild-type BRCA2 allele could destroy an important DNA repair mechanism.
Marine bony fish __________ water by osmosis, while freshwater bony fish __________ water by osmosis. Fill in the blank(s) with the appropriate word(s)
Superantigens produced by Staphylococcus aureus are a class of antigens that cause non-specific activation of T cells resulting in their activation and massive cytokine release which may harm the host
a. true b. false