You shine light having a wavelength of 660 nm on a plant. Which of the following will most likely happen next?
a. Pfr is stored for later use.
b. Pr is synthesized.
c. Pr is converted to Pfr.
d. Pfr is converted to Pr.
e. Pr is degraded.
c
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In bacteria, the porins have the unique ability to transport
A) all hydrophilic molecules. B) hydrophilic molecules of a particular size. C) all hydrophobic molecules. D) hydrophobic molecules of a particular size. E) any molecule, regardless of properties or size.
Disruption of neural signaling can produce profound changes in mood and behavior. Cocaine exerts its effects by
A. blocking norepinephrine and dopamine reuptake from synapses. B. blocking serotonin reuptake from synapses. C. preventing neurotransmitter vesicle fusion with presynaptic neuron membranes. D. blocking the enzyme acetylcholinesterase. E. binding to the GABA receptor to enhance inhibitory neurotransmission.
Steroid hormones do not require a membrane receptor because they:
a. are small enough to pass directly through pores in the membrane b. are lipid-soluble and pass through the bilayer c. pass through special channels d. are water-soluble e. dissolve in the cholesterol of the membranes
Repair enzymes _____
a. repair only mutations that occur in mitochondrial DNA b. repair only mutations that arise during replication c. repair only DNA mismatch mutations d. can only repair mutations that occur prior to replication e. can only repair mutations that occur after replication