Would plant roots exhibit gravitropism in outer space? Why or why not? What will be an ideal response?
No, they would not as there would be no gravity. In the absence of gravity the statoliths would not
sink to the bottom of the cell. As a result, there would be no redistribution of the auxin efflux carriers
and no hormonal influence to drive roots in any particular direction.
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Which of the following is a purine?
A) guanine B) cytosine C) thymine D) uracil E) cysteine
A green automobile hood exposed to sunlight will produce far more heat than a green leaf exposed to the same amount of sunlight. Why is this?
a) The electrons in the pigment of the automobile hood have no mechanism for reaching an excited state, so all of the heat from the sun will be absorbed; in the leaf, the chlorophyll pigment provides a locus for excitation of electrons by light. b) The automobile hood has no mechanism for capturing the energy of its excited electrons, so it releases that energy as heat as the electrons fall back to their ground state; a leaf contains primary electron receptors, which will capture the energy and put it to use in making ATP and NADPH. c) The automobile hood has no mechanism for capturing the energy of its excited electrons, so it releases that energy as heat as the electrons fall back to their ground state; a leaf contains primary electron receptors, which will capture the energy and put it to use in making ADP and NADP+. d) The green color of the automobile hood is not the result of a pigment, while the green color of the leaf is the result of the chlorophyll pigment. e) The automobile hood absorbs heat from other sources, such as the engine and the pavement, while the leaf is cooled by the shade of other leaves.
Women suffering from uncontrolled diabetes often experience infections from which of the following?
a) Trichomonas vaginalis b) Candida albicans c) Neisseria gonorrhoeae d) Gardnerella vaginalis
Transgenic animals
A. are often obtained from germline engineering. B. will pass the genes on to their offspring. C. can be engineered to become factories for manufacturing proteins. D. commonly include mice. E. All of the choices are correct.