Which one of the following most accurately describes the ratio of oxygen to carbon to hydrogen in a simple sugar such as glucose?
A. 1 : 2 : 1
B. 1 : 1 : 2
C. 2 : 1 : 1
D. 1 : 2 : 3
E. 1 : 3 : 2
Answer: B
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Many bryophytes have to tolerate desiccation because ___________. (Select all that apply.)
A. they dry out with the environment B. they have little water-storage capacity C. they are restricted to sunny habitats D. they are restricted to saline habitats
In tracheophyte plants, water and dissolved minerals are conducted away from roots by
A. water vessels. B. stomata. C. phloem tubes. D. xylem tubes. E. chloroplasts.
The reason the light reactions have both cyclic and noncyclic electron pathways is
a. because the light-independent reactions require ATP and NADPH in different amounts than are generated by noncyclic electron flow. b. to ensure that ATP and NAPDH are generated in a 1:1 molar ratio. c. because only the combination of pathways can generate sufficient NADPH for the lightindependent reactions. d. to provide more electrons from water than would be released by the noncyclic pathway. e. because a single photon of light can't energize a ground state electron in photosystem II to the level necessary for transfer to photosystem I's primary electron acceptor.
A bacteria contains two copies of the lac operon; one on the bacterial chromosome and one on a plasmid. The lacO site on the chromosomal lac operon is mutated and nonfunctional, whereas the lacO site on the plasmid is functional. What is the most likely outcome for the bacterial cell when glucose is declining and lactose is present?
A. Expression of lac structural genes on the chromosome and plasmid will decrease because two copies of the lacO site are needed for repression of the lac operon. B. Expression of lac structural genes on the chromosome and plasmid will increase because the lacO site does not affect the CAP protein that activates the operon. C. Expression of lac structural genes on the chromosome and the plasmid will increase because more repression of the lac operon occurs as glucose decreases. D. Expression of lac structural genes will not change because the lacO site is not involved in repression of the lac operon.