All of the following are a form of potential energy that can be used by a cell EXCEPT
A. concentration gradient.
B. ATP.
C. NADH.
D. nitrogen.
E. an electrical/ion gradient.
Answer: D
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An arrowworm is a type of planktonic
a. herbivore. b. detritivore. c. carnivore. d. omnivore. e. filter feeder.
Which of the following statements considering the human body as an ecosystem is incorrect?
A. Lactobacillus acidophilus and Lactobacillus jensenii are populations within the vaginal community. B. The microbes present in dental plaque constitute a community. C. The skin, the gut, and the nasopharynx are all habitats. D. An infection can be considered a habitat's response to an alteration in environmental conditions.
Most invertebrates have:a
isolecithal eggs and meroblastic cleavage. b. telolecithal eggs and meroblastic cleavage. c. isolecithal eggs and holoblastic cleavage.
d. telolecithal eggs and holoblastic cleavage. e. isolecithal eggs and radial cleavage.
Which of the following is composed of DNA?
A. centriole and chromosomes B. chromosomes and chromatin C. chromatin and nucleoli D. nucleoli and centrioles