During photosynthesis, which step is most responsible for a plant's acquisition of new organic material?
a) the "building" of NADPH during the Calvin cycle
b) the excitation of chlorophyll molecules by photons of light
c) the "plucking" of carbon atoms from the air and fixing of the carbons to the organic molecules within the chloroplast
d) the loss of water through evaporation
e) ATP made during the light reactions
Ans: c) the "plucking" of carbon atoms from the air and fixing of the carbons to the organic molecules within the chloroplast
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Which of the following statements is true regarding the experiment described in the text to investigate plant communication via volatile chemicals?
A. The investigators found that volatile chemicals released from damaged plant tissues attract predators but do not affect neighboring plants. B. The experimental plants were exposed to air that had passed through a chamber containing plants with simulated herbivore damage. C. The investigators were testing the hypothesis that volatile chemicals released from plants attract herbivore predators. D. The investigators found that only the damaged plants contained elevated levels of defensive compounds in their leaves when compared with control plants. E. The investigators disproved the hypothesis that some plants "eavesdrop" on their neighbors' defense responses.
A network of protein filaments called ____ lines and reinforces the inner surface of the nuclear envelope in animal
cells.
a. actins b. chromatins c. lamins d. tubulins e. lamellae
Approximately how many times more gametes are found in a single male ejaculation compared to all the eggs found in a female at puberty?
A) 625 times B) 20 times C) 20,000 times D) 1,000,000 times
The ____ of the eye focuses light on the eye's photoreceptors. In the above diagram of the eye, which letter identifies
it?
a. retina; C b. lens; B
c. lens; A d. fovea; D e. retina; B