Why are leaves usually so thin? When might you see thicker leaves?

What will be an ideal response?


Most leaves are quite flat to allow for a large surface-to-volume ratio. This in turn exposes more photopigments to the sun, which promotes more photosynthesis. In very dry climates, leaves are often thick or needle-like to help conserve water and limit evaporation.

Biology & Microbiology

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MHC markers are

a. a type of PAMP. b. special receptors on T cells. c. self proteins on body cells. d. antibodies attached to a B cell plasma membrane. e. Y-shaped proteins secreted by B cells.

Biology & Microbiology

Stabilizing selection occurs when

a. the environment controls which organisms will survive. b. humans determine which organisms will survive. c. the extremes of the population have a lesser chance to survive. d. the extremes of the population have a better chance to survive. e. the organisms on one extreme of the population have a better chance to survive than those on the other extreme.

Biology & Microbiology

What is being described? The RNA strand grows one amino acid at a time

What will be an ideal response?

Biology & Microbiology

Corn belongs to the kingdom

(a). Plantae. (b). Animalia. (c). Fungi. (d). Protista. (e). Archaea.

Biology & Microbiology