What is the purpose of the poly-A tail added to mRNA before it leaves the nucleus?
a. It provides a destination for movement in the cell.
b. It notifies the cell that this molecule is “self.”
c. It protects against exonuclease activity.
d. It provides the final instructions for protein synthesis.
c. It protects against exonuclease activity.
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All of the following statements are evidence that evolution of the FoxP2 gene may have contributed to the evolution of language in humans EXCEPT:
A. Individuals with mutations in FoxP2 have problems with speech and language. B. The FoxP2 gene shows an elevated frequency of non-synonymous to synonymous mutations when comparing human-chimp sequences relative to mousechimp comparison. C. Studies of Neanderthal DNA have shown that Neanderthals possessed the modern human version of FoxP2. D. FoxP2 is an evolutionarily conserved transcription factor that plays an important role in development, including brain development.
Epinephrine and norepinephrine are ____ hormones
a. steroid b. glucocorticoid
c. mineralocorticoid d. gonadotropin e. catecholamine
Members of the lineage ____ have a pair of shells that are hinged together. They close the shells
together by contraction of one or two adductor muscles.
a. Cephalopoda b. Polyplacophora c. Bivalvia d. Gastropoda e. Scaphopoda
In a muscle contraction event, what causes the
release of calcium from its endoplasmic reticulum?
a. the hydrolysis of ATP b. the formation of ATP c. the formation of the actin-myosin crossbridge d. a signal from a motor neuron e. the shortening of the sarcomere