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

Thin, sheet-like structures that cover all body surfaces and line body cavities are known as

What will be an ideal response?

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