Which of the following types of cell cleavage is found most often for deuterostomes?
a. radial, indeterminate cleavage
b. spiral, determinate cleavage
c. radial, determinate cleavage
d. spiral, indeterminate cleavage
Ans: a. radial, indeterminate cleavage
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During the development of the vulva in Caenorhabditis, binding of ____ to its receptor initiates development into ____ cell. (Select all correct choices.)
A. EGF; a Type 1 B. EGF; a Type 2 C. Notch; a Type 1 D. Notch; a Type 2 E. EGF; an anchor
When a sarcomere is at rest, the myosin
binding sites on actin are blocked by a. calcium. b. troponin. c. tropomyosin. d. the myosin heads. e. ADP.
Approximately what percentage of prokaryotes are thought to be pathogens?
A) <1% B) 12% C) 26% D) 48%
Most of the ocean's productivity occurs ____.
A. in the open ocean B. in the intertidal zone C. in the pelagic province D. near hydrothermal vents E. in the benthic province