Which amino acid is most soluble in water?
A. glycine
B. serine
C. leucine
D. valine
Answer: B
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Genetic imprinting is caused by ____
a. insertion of a nucleotide into an exon b. deletion of an amino acid from the mRNA strand c. a frameshift mutation d. epigenetic changes to DNA e. a change in a termination codon
Many prokaryotes can switch between using aerobic respiration and fermentation depending on oxygen availability; these organisms are termed which of the following?
a. obligate anaerobes b. facultative anaerobes c. necessary anaerobes d. facultative aerobes
The occurrence of an RNA world early in the history of life can never be proven, but experiments with _____ have
shown that it is feasible. a. in vitro evolution b. Darwin’s evolution c. indirected evolution d. chemical evolution e. biological evolution
Membrane proteins serve many functions. One of the functions is transportation of substances across the membrane. If a cell biologist placed cells into an environment in which a chemical has been added that blocks the function of only carrier proteins, the process that will be affected is
A. pinocytosis. B. phagocytosis. C. simple diffusion. D. active transport. E. osmosis.