Cellular membranes are
A. fluid.
B. solely composed of lipids.
C. composed of a single layer of amphipathic molecules.
D. selective to the transport of gases and small molecules only.
E. characteristic of eukaryotes, but not prokaryotes.
A. fluid.
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Which of the following best explains the expectation that asexually reproducing rotifers would have greater sequence differences in the two alleles of a gene than sexually reproducing rotifers?
A. The two alleles of a gene do not recombine in asexual reproduction and thus different mutations accumulate on the two alleles. B. Mutations occur more frequently in asexually reproducing animals than sexually reproducing animals. C. Sexually reproducing organisms evolve more rapidly than asexually reproducing organisms. D. Asexual reproduction increases population sizes more rapidly than sexual reproduction, so more differences accrue. E. All of the answer options are correct.
The "9 + 0" cilia arrangement is associated with
A) eubacteria. B) cyanobacteria. C) cilia lining the respiratory tract. D) flagella on sperm cells. E) animal embryonic development.
Hormones important in maintaining homeostasis are generally part of a ________ feedback loop.
Fill in the blank(s) with the appropriate word(s).
Scientists begin constructing a simplified view of nature by ________________
Indicate whether the statement is true or false.