When a sarcomere is at rest, the myosin binding sites on actin are blocked by _____
a. phosphorous
b. sodium
c. tropomyosin
d. the myosin heads
e. AMP
ANSWER: c
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Formation of which one of the following large organic molecules from their respective building blocks does not result in the release of at least one water molecule?
A. proteins B. phospholipids C. polysaccharides D. nucleic acids E. proteins, phospholipids, polysaccharides and nucleic acids all release water as a result of their formation.
A potent neurtoxin that causes paralytic shellfish poisoning in coastal temperate North America is produced by ________.
A. dinoflagellates B. green algae C. red algae D. diatoms
The cell in micrograph "IV" is at which stage
of the cell cycle?
a. prophase b. telophase c. interphase d. anaphase e. metaphase
The interleukin-2 (IL-2) growth factor interacts with receptors on
A) embryonic cells. B) cytotoxic T lymphocytes. C) mesenchymal cells. D) smooth muscle cells. E) epithelial cells.