The following steps refer to various stages in transmission at a chemical synapse
1. Neurotransmitter binds with receptors associated with the postsynaptic membrane.
2. Calcium ions rush into neuron's cytoplasm.
3. An action potential depolarizes the membrane of the presynaptic axon terminal.
4. The ligand-gated ion channels open.
5. The synaptic vesicles release neurotransmitter into the synaptic cleft.
Which sequence of events is correct?
A) 1 ? 2 ? 3 ? 4 ? 5
B) 2 ? 3 ? 5 ? 4 ? 1
C) 3 ? 2 ? 5 ? 1 ? 4
D) 4 ? 3 ? 1 ? 2 ? 5
E) 5 ? 1 ? 2 ? 4 ? 3
Answer: C
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Pyruvate passes freely across some intracellular membranes. The membranes of the ________ must be crossed by pyruvate prior to its oxidation during respiration.
Fill in the blank(s) with the appropriate word(s).
An artificial vesicle composed of a lipid bilayer is mixed with several peripheral membrane proteins and analyzed by freeze-fracture electron microscopy. What will be seen in the resulting image?
A. bumps will be visible on both layers B. bumps will be visible only in the extracellular face (E face) C. bumps will be visible in the protoplasmic face (P face) D. No bumps will be visible in either face
During transcription of the trp operon, pairing of regions 2 and 3 in the leader peptide mRNA creates a(n) ________ signal
A) continuous B) termination C) antitermination D) induction E) repression
Complete transfer in an Hfr × F? mating takes approximately ________ minutes.
A. 20 B. 50 C. 200 D. 100