Hyperpolarization of the postsynaptic nerve terminal
A) decreases the chance that an action potential will be initiated.
B) increases the chance that an action potential will be initiated.
C) has no effect on the initiation of an action potential.
D) is stimulated by an influx of calcium ions.
E) sensitizes receptors to activation by lower levels of neurotransmitter.
Answer: A
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Fibroblast cells that uptake cloned MyoD DNA
A. do not contain DNA with muscle-cell-specific enhancer sequences. B. produce myosin and bHLH protein, but do not produce protein E. C. probably produce protein E and therefore will not differentiate into muscle cells. D. produce protein I, myosin, and myogenic bHLH protein. E. produce protein E, myosin, and myogenic bHLH protein.
To create a DNA profile from scarce quantities of DNA, such as a fossil or a single hair, the ____________________
technique is necessary to obtain enough DNA for analysis. Fill in the blank(s) with the appropriate word(s).
What are some reasons that cells need to communicate?
What will be an ideal response?
STR markers that are used for forensic DNA typing are chosen from separate ___ to avoid any linkage between markers.
What will be an ideal response?