1) In an excitatory synapse A) the membrane potential of the post synaptic neuro
ID: 3166843 • Letter: 1
Question
1) In an excitatory synapse A) the membrane potential of the post synaptic neuron becomes more negative B) there is no change in the membrane potential of the post synaptic neuron C) the membrane potential of the post synaptic neuron becomes more positive 2) Most extracellular signal molecules act on cell-surface (membrane) rather than intracellular receptors (cytoplasm or nucleus) because they are: A) Either too large, too hydrophilic, or both to pass directly across the plasma membrane B) Too hydrophilic to pass directly across the plasma membrane C) Too large to pass directly across the plasma membrane 3) The ability of a protein to bind selectively and with high affinity to specific molecules is due to which types of bonds? A) Weak, noncovalent bonds B) Strong, covalent bonds 4) When an action potential reaches a nerve terminal, what type of voltage-gated channels are opened and result in the fusion of remrane K+ synaptic vesicles with the cell membrane? A) CI- B) Na+ D) Ca2+ 5) The attachment of modifying groups (ex. Phosphate) to a protein can control what aspects of a protein? A) Its behavior or activity B) Its stability or its binding patterns C) Its location within the cell D) All of the above E) A and B, but not C 6) Glycolipids and glycoproteins have what function: A) they are used in cell-cell recognition and adhesion B) they regulate gene expression C) they transport ions across the membrane of the endoplasmic reticulum D) they are needed for transport into the nucleus 7) In passive transport, a charged solute moves spontaneously in which way? A) Down its concentration gradient B) Down its electrochemical gradient C) Down its osmotic gradient 8) Lipid bilayers are highly impermeable to A) carbon dioxide B) Na+ and Cl- C) water D) ethanolExplanation / Answer
1. Option A is correct.
In an excitatory synapse, the membrane potential of the post synaptic neuron becomes more negative.
2. Option A is correct.
Large, polar and hydrophilic molecules can not cross the hydrophobic lipid bilayer.
3. Option A is correct.
The ability to bind selectively and with high affinity to specific molecules is due to weak, noncovalent bonds.
4. Option B is correct.
5. Option D is correct.
6. Option A is correct.
7. Option A is correct.
8. Option B is correct.
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