Which stage in reproduction and development occurs

before the others?
a. cleavage
b. gamete formation
c. gastrula formation
d. zygote formation
e. blastula formation


Answer: b

Biology & Microbiology

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In order for a G protein to be active:

A. the alpha subunit must bind GTP. B. the beta and gamma subunits must separate from the alpha subunit. C. both the beta and gamma subunits must bind GTP. D. the alpha subunit must bind GTP and the beta and gamma subunits must separate from the alpha subunit.

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Which of the following were key events in the evolution of vascular plant leaves? Select all correct choices

A. the conversion of stems (or branches) to flattened structures B. the development of apical meristem identity genes C. the development of leaf meristematic cells D. the development of leaf identity genes

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A species' _____ niche comprises the full range of climate conditions and food resources that permit the individuals in a species to live

A. ecological B. fundamental C. realized D. ecological and fundamental E. ecological and realized

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The pH scale measures the

a. hydroxide ion concentration. b. concentration of a water-based solution. c. hydrogen ion concentration. d. number of water molecules in a solution. e. concentration of dissolved solute.

Biology & Microbiology