Which of the following statements is correct regarding cyclic photosynthetic pathways?
A) Water molecules need to be split.
B) Both PSI and PSII are required.
C) Proton gradients are not formed.
D) No exogenous electron source is required.
E) all of the above
D) No exogenous electron source is required.
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Which cell structure is most likely responsible for sensing gravity?
A. central vacuole B. Golgi appartus C. chloroplast D. amyloplast E. apical meristem
A drug designed to stop neurons from recharging would block the step in which ions
A. are actively pumped against their concentration gradient. B. spontaneously move down their concentration gradient. C. spontaneously move against their concentration gradient. D. are actively pumped down their concentration gradient. E. are in the resting potential state.
In a muscle that is resistant to fatigue, such as that of a marathon runner, you would expect
A) a nonstriated appearance. B) elevated levels of ATP. C) very few mitochondria. D) a limited (or decreased) blood supply.
Which of the following phyla is a member of the Radiata?
a. Nemertea b. Porifera c. Rotifera d. Ctenophora e. Echinodermata