Which amino acid is most soluble in water?

A. glycine
B. serine
C. leucine
D. valine


Answer: B

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology