Photoreceptors are found in the

(a) lens.
(b) ciliary body.
(c) iris.
(d) retina.


(d) retina.

Biology & Microbiology

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Which of the following cause stomata to close? (Select all correct answer options.)

A. abscisic acid B. water loss C. sunlight D. low CO2 in the leaf

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Which of the following describes an organelle?

a. A membrane-bound sac within a cell b. A structure made of tissues operating together c. A group of similar cells carrying out the same function d. An individual living entity

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The ABO blood types have __________ different

genotypes. a. 4 b. 6 c. 8 d. 12 e. 16

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In an active state of a G protein

a. the ? subunit binds to a target protein and the ?? subunit remains bound to the receptor. b. the ? and ?? subunits both can bind to target proteins. c. the ?? and ? subunits both can bind to target proteins. d. the ? subunit can bind to a target protein and the ?? subunit remains bound to the receptor.

Biology & Microbiology