Identify the point in time during an action potential when a positive feedback process is occurring in a neuron.
A. when the neuron is at rest
B. as the neuron is being depolarized and passes the threshold potential
C. after the peak depolarization of the action potential when it is rapidly repolarizing
D. during the undershoot phase when the neuron is slightly hyperpolarized relative to the resting potential
E. A positive feedback process is occurring at all the time points given.
B. as the neuron is being depolarized and passes the threshold potential
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Certain bacteria are capable of transforming atmospheric nitrogen into a form other organisms can use through a process known as
A. nitrogen reduction. B. nitrogen fixation. C. combustion. D. nitrogen oxidation.
A scientist is studying the HOTAIR ncRNA in human cells growing in culture. She identifies a mutation in a cell line that she suspects may affect the function of HOTAIR. The mutation changes the sequence in region 2 from 5?-CUCCCUU-3? to 5?-CUGGACG-3? (see diagram). How will this mutation affect the function of HOTAIR?
A. The mutant HOTAIR will bind to different target genes than the normal HOTAIR, but it will not inhibit their expression. B. The mutant HOTAIR will bind to the same target genes as the normal HOTAIR, but it will not inhibit their expression. C. The mutant HOTAIR will bind to different target genes than the normal HOTAIR, and it will inhibit their expression. D. The mutant HOTAIR will not be produced. E. There will be no difference in the function of the mutant and normal HOTAIR ncRNAs.
The individuals that disperse as a response to high population density are
A) mostly the younger members of the population. B) more likely to survive. C) mostly females. D) usually superior competitors.
What refers to the situation in which the binding of a substrate to the enzyme causes a change in the enzyme's shape,
facilitating an enzyme's function? a. active site b. cofactor c. induced fit d. activation energy e. allosteric inhibition