Which ion is required to be present in a significant quantity in order to allow myosin heads to form cross bridges with actin filaments?

a. Calcium
b. Hydrogen
c. Potassium
d. Sodium
e. Glucose


a

Biology & Microbiology

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Organisms categorized as osmoconformers are most likely _____

A) found in freshwater lakes and streams B) marine C) amphibious D) found in arid terrestrial environments E) found in terrestrial environments with adequate moisture

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Nearly all of the foods we eat come from which group of plants?

A. conifers B. ferns C. cycads D. angiosperms E. bryophytes

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The spermatid is cell number

a. 2. b. 3. c. 4. d. 5. e. 6.

Biology & Microbiology

Plants in general require how many essential

elements, both macro and micro, for their growth and survival?

a. 6 b. 12 c. 16 d. 22 e. 28

Biology & Microbiology