In the accompanying diagram, ____ represents the beginning of chemical digestion
a. A
b. E
c. D
d. H
e. I
ANSWER: a
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The molecule of chlorophyll a in photosystem II's reaction center is known as P680 because ____
a. it absorbs 680 photons per minute b. it absorbs photons with a wavelength of 680 nm c. there are exactly 680 accessory pigments in the photosystem d. it will generate 680 molecules of ATP per photon absorbed e. there are 680 electrons that can be energized by light
Nitrogen is a growth-limiting nutrient for many organisms because
A) it is necessary for the biosynthesis of amino acids. B) it is required for synthesis of nucleotides. C) it is required for lipid synthesis. D) only a small number of bacteria are able to extract it from the atmosphere. E) only a few microbes can extract it from the atmosphere, but all organisms require it for amino acid and nucleotide synthesis.
Unusual cellular extensions called prosthecae are associated with which of the following groups of proteobacteria?
A) alphaproteobacteria B) betaproteobacteria C) gammaproteobacteria D) deltaproteobacteria E) epsilonproteobacteria
Zebrafish embryos change the color of the melanophore cells in their skin to a darker shade:
A. by dynein motor proteins moving pigment granules outward from the center of the cell. B. by kinesin motor proteins moving pigment granules outward from the center of the cell. C. by dynein motor proteins moving pigment granules inward toward the center of the cell. D. by kinesin motor proteins moving pigment granules inward toward the center of the cell. E. by dynein motor proteins moving pigment granules inward toward the plus end of microtubules.