Which chemical is photosensitive and allows plants to "measure" day length?
A) abscisic acid
B) malic acid
C) cytokinin
D) phytochrome
D
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Electron microscopes differ from light microscopes in that
(a) electrons are used instead of light. (b) magnetic lenses replace glass lenses. (c) the electron path had to maintained in a high vacuum. (d) a, b, and c are all true.
Which of the following is the primary advantage of C4 plants over C3 plants?
A. C4 plants minimize photorespiration compared with C3 plants. B. C4 plants can produce sugars more efficiently than C3 plants under hot, arid conditions. C. C4 plants can produce CO2 needed for sugar production in the Calvin cycle more efficiently than C3 plants. D. Relative to C3 plants, C4 plants can keep their stomata closed more frequently to limit water evaporation, yet can still produce significant CO2 needed for sugar production. E. All of the choices are correct.
The MAIN components of a cell membrane are
A. phospholipids and proteins. B. steroids and carbohydrates. C. nucleic acids and simple sugars. D. proteins and steroids.
Diploid cell formed by the union of two gametes; the product of fertilization.
What will be an ideal response?