Homework Answers
In photoreceptors, in the presence of light, injection of cGMP would hyperpolarize the cell.
Photoreceptors cells is specialized type of cell found in the retina that is capable of visual phototransduction.
the depolarized state of photoreceptors in the dark depends on the presence of ion channels in the outer segment membrane that permit Na+ and Ca+ ions to flow into the cell. the outer segment being open or closed is regulated in turn by the levels of nucleotide cyclic guanosine monophosphate (cGMP) . in darkness high levels of cGMP in the outer segment keep the channels open. in light however, cGMP levels drop and some of the channels close leading to hyperpolarisation.
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Question 8 0.5 pts In photoreceptors, in the presence of light, injection of cGMP would: depolarize...
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Question 7 0.5 pts What is the smallest number of photons of light that are able to elicit a change in membrane potential in a photoreceptor? O 1 O2 05 50
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Question 16 1.5 pts If a neuron is treated with a substance that inhibits the sodium-potassium pump, what would be the most immediate effect on the cell? the cell's membrane potential would immediately depolarize to 0 (zero) millivolts the cell's resting potential would slowly depolarize the cell would quickly run out of ATP the cell's osmotic balance would be disrupted and the cell would begin to swell no change at all
QUESTION 42 The amino acid GABA is a commonly used neurotransmitter in the nervous system. If...
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Question 8 1 pts In living cells, which of the following manipulations would cause the resting membrane potential (i.e. Erest) of a living neuron to become more electronegative? Decreasing the threshold of a neuron Increasing the number of opened K+ leak channels in the plasma membrane Decreasing the ICF/cytoplasmic K* concentration Decreasing the number of voltage-gated Nat channels Decreasing the activity of the Nat/K* ATPase
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I need help ASAP pleaseeee it is due in 30mins
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Please help me with ALL of these questions. Thank you so
much
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Only Q1 Question 8 0.5 pts According to the phase diagram shown below, what is the...
Only Q1
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QUESTION 42 The amino acid GABA is a commonly used neurotransmitter in the nervous system. If GABA were to bind directly to receptors and open chloride channels in an early developing neuron that had 100 mM chloride in the cytoplasm and 100 mM chloride in the extracellular fluid, the release of GABA from a presynaptic neuron would . hyperpolarize the post-synaptic cell and inhibit the production of action potentials in the post-synaptic cell lead to no change in the voltage...
Question 1 0.1 pts (Ch 8.4; Cell-to-cell Communication in the Nervous System) Which of the following would typically depolarize the membrane potential of an adult neuron? O opening a potassium channel O an inhibitory postsynaptic potential O glycine O closing a sodium channel O acetylcholine
Question 8 1 pts In living cells, which of the following manipulations would cause the resting membrane potential (i.e. Erest) of a living neuron to become more electronegative? Decreasing the threshold of a neuron Increasing the number of opened K+ leak channels in the plasma membrane Decreasing the ICF/cytoplasmic K* concentration Decreasing the number of voltage-gated Nat channels Decreasing the activity of the Nat/K* ATPase
Question 13 7 pts Which of the following statements accurately describes why an animal cell would be surrounded by an extra cellular matrix instead of a cell wall? Hint: • Extracellular components a video • Textbook chapter 4 under section 4.6 A cell wall would completely isolate the neighboring cells that are found within multicellular organisms, and because of this, it would prevent the ability of those cells to communicate with each other. The polysaccharide cellulose that is found in...
I need help ASAP pleaseeee it is due in 30mins
Question 5 (0.5 points) If you added a enzyme to a protein sample in which the polymers were degraded into individual amino acids, what would you expect after adding Biuret reagent? OA) A deep violet purple color would be present B) Enzymes cannot be used to break down proteins C) There would be no reaction and thus no color change D) The color of the solution would reflect the concentration...
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Please help me with ALL of these questions. Thank you so
much
Question 7 0.3 pts The chloroplast is a membrane-bound organelle very similar to the mitochondrion. Both organelles are thought to have been acquired through an endosymbiotic event where a bacterium was engulfed by an ancestral eukaryotic cell and accidentally retained over evolutionary time and evolved into specialized organelles. Which area of the chloroplast is most similar to the inner membrane of the mitochondria such that both areas in...
Only Q1
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