Nicotine affects neurotransmission by causing more action potentials in the presynaptic neuron and by causing more neurotransmitter to be released per vesicle. This means your postsynaptic neurons
A) are unaffected by nicotine.
B) are more easily stimulated in the presence of nicotine.
C) are harder than normal to stimulate in the presence of nicotine.
D) cannot be stimulated at all in the presence of nicotine.
E) are uncoordinated in the presence of nicotine.
B
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The chemical reaction illustrated in the accompanying figure _____
A) is a hydrolysis reaction B) results in a peptide bond C) joins two fatty acids together D) links two polymers to form a monomer E) joins two phospholipids in a bilayer
Auxin moves between cells through a process called polar transport. Auxin molecules move from one cell to the next through PIN proteins. However, their movement is unidirectional. What accounts for this unidirectional movement?
A. PIN proteins are only found on the basal side of the cell. B. PIN proteins are only found on the apical side of the cell. C. Auxin diffuses down its concentration gradient. The concentration of auxin molecules decreases as you move down the stem away from the apical meristem. D. Auxin moves independently of its concentration gradient because the presence of the PIN protein provides a channel that auxin can "leak" through to get into adjacent cells. E. Auxin in the unprotonated form can move between cells by going into adjacent spaces occupied by plant cell walls. The movement of auxin is lateral, not unidirectional.
Antibodies are
A. forms of vaccines B. type of cells that protect the body C. viruses that cause diseases D. foreign substances that stimulate an immune response E. proteins that protect the body
The model of eukaryotic DNA replication control via a licensing factor suggests that active licensing factor becomes associated with DNA
a. during replication. b. during mitosis, when the nuclear envelope breaks down. c. immediately following replication. d. immediately before mitosis, when chromosomes begin to condense. e. immediately following mitosis.