amino acides that cannot be produced by the body are called __________ amino acids
Fill in the blank(s) with the appropriate word(s).
essential
Biology & Microbiology
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T cells can be classified as:
A. helper T cells. B. memory T cells. C. cytotoxic T cells. D. either helper T cells or memory T cells.
Biology & Microbiology
Vertebrate bone consists primarily of a crystalline mixture of which two substances?
A. Ca2+, PO4- B. Ca2+, SO4- C. Ca2+, Cl2 D. Na+, Cl- E. Adenosine, PO4-
Biology & Microbiology
Which concept helps visualize resource use and the potential for interspecific competition in nature?
a. allopatric speciation b. the competitive exclusion principle c. sympatric speciation d. ecological niche e. resource partitioning
Biology & Microbiology
Thin, sheet-like structures that cover all body surfaces and line body cavities are known as
What will be an ideal response?
Biology & Microbiology