Which of the following strongly suggests that the membrane is exposed to low temperature?
a. Ions such as K+, Na+, and Ca+ begin to freely leak across the membrane.
b. Molecular motion may increase.
c. Molecular motion may decrease.
d. The membrane may become too fluid.
Ans: c. Molecular motion may decrease.
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In a freshwater pond, a green alga is likely to be
A) colonial. B) filamentous. C) unicellular. D) colonial, filamentous, multicellular, or unicellular.
Which of the following are commonly used to study phylogeny?
A. Whole genomes because they are easy to obtain. B. Segments of membrane proteins because the proteins are encoded by DNA. C. Specific mRNA chloroplast sequences because they are found in the genomes of all living organisms. D. Small ribosomal subunit (SSU) RNA because it is found in the genomes of all living organisms. E. None of these answers are correct.
Island species are especially vulnerable to extinction because may destroy a small island population.
A. the introduction of a new predator B. a single event like a hurricane C. random fluctuations in birth and death rates D. All of the answer choices are correct. E. the extinction of a prey species
Griscelli syndrome, a disease caused by mutations in the gene encoding Rab27a, is characterized by abnormal
a. transport of melanosomes. b. export of neurotransmitters. c. export of vesicles in T lymphocytes. d. Both a and c