At which of the following time points in an action potential is a positive feedback process 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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One function of the 3' UTR (untranslated region) of mRNA is to ____
a. control the half-life of mRNA b. bind RNA polymerase to initiate transcription c. help activators bind to the enhancer region d. base pair with the translated region of the transcript to mark it for degradation e. bind ribosomes to initiate translation
Which of the following is used by all living things as the carrier of genetic information?
A. Cell B. DNA C. Organ D. Molecule E. Population
Bacteria are most essential in the cycling of:
a. carbon. b. water. c. phosphorus. d. nitrogen. e. energy.
Electrons from the “quinone pool” in purple bacteria are used to reduce NAD+ in a process called
a. ATP synthase (ATPase) complexing. b. proton motive force. c. reverse electron transport. d. oxygenic photophosphorylation.