Suppose a neuron was at rest around -65 mV when it was exposed to a neurotransmitter that caused the neuron to hyperpolarize. Which of the following could be the effect of the neurotransmitter?
What will be an ideal response?
It increased K+ conductance
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Covalent modification
A) can activate an enzyme. B) affects the activity of an enzyme by adding or removing a chemical group. C) can involve the addition of phosphate groups. D) produces modifications that can sometimes be reversed. E) all of the above
What is an alternative to RNA as the first polymer of life?
a. single nucleotides b. non-genetic polymers c. polymers that do not form a double helix d. other genetic polymers containing different sugars e. other genetic polymers containing different amino acids
Symptoms of a common cold, such as runny nose and sore throat, most directly result from
a. attachment of virus particles to the mucosa of the upper respiratory tract. b. cell death in the lining of the nose and throat. c. the body's attempts to defend against the infection. d. general stress and social isolation brought about by having an infection. e. psychological conditioning based on previous infections.
As a microbiologist, you have been asked to investigate the regulation of a novel gene in a bacterial species. Given what is known about bacteria, the logical place to begin your investigation is
A. translational regulation. B. regulation by enhancer elements. C. transcriptional regulation. D. regulation by general transcription factors. E. alternative splicing regulation.