In an active state of a G protein
a. the ? subunit binds to a target protein and the ?? subunit remains bound to the receptor.
b. the ? and ?? subunits both can bind to target proteins.
c. the ?? and ? subunits both can bind to target proteins.
d. the ? subunit can bind to a target protein and the ?? subunit remains bound to the receptor.
Ans: b. the ? and ?? subunits both can bind to target proteins.
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Which of the following is a characteristic of microRNAs (miRNAs)?
A. MicroRNAs are short RNA molecules. B. MicroRNAs silence the expression of specific mRNAs. C. MicroRNAs are found in plants and animals. D. MicroRNAs are cut by an enzyme called dicer. E. All of the choices are correct.
T cell receptors can discriminate between self (MHC markers) and nonself (____)
Fill in the blank(s) with correct word
Homologous organs
a. are the results of very different genetic blueprints. b. can have different functions. c. show structural differences in the embryos but are similar in the adult organisms. d. are only found within a species. e. have the same function.
Fossil evidence shows that giraffes living 1000 years ago had much shorter necks than the giraffes
seen today. Which of the following statements best explains this observation? a. The two groups of giraffes are not related. b. The two groups of giraffes arose as a result of convergent evolution. c. The giraffes acquired longer necks through the continuing process of natural selection. d. The difference in neck length supports Lamarck's hypothesis. e. The difference in neck length is evidence for homoplastic inheritance