________ organisms are unable to regulate their body temperature and must rely on ________ to maintain optimal membrane fluidity
Fill in the blank with correct word.
Answer: Poikilothermic; homeoviscous adaption
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The organic non-protein components that aid in enzyme functioning are called
A. reactants. B. cofactors. C. coenzymes. D. substrates. E. products.
Answer the following statements true (T) or false (F)
1. The most efficient plants at producing sugars under hot and arid environments maximize photorespiration. 2. Hormones regardless of whether they operate locally or at long distances must bind a receptor to elicit a cell response. 3. Auxin is a plant hormone that causes cells to shorten and allow plant growing tips to move toward the sun. 4. In terms of cell signaling, estrogen in animal cells works in a similar fashion as the plant hormone auxin via binding to intracellular receptors.
Pufferfish (Fugu) are a delicacy in Japan, but must be cleaned very carefully as their liver contains tetrodotoxin which blocks voltage-gated Na+ channels. Imagine you are testing for the presence of this toxin using a neuron in a dish. You apply an electrical stimulus to the neuron that should produce an action potential. What will you observe if tetrodotoxin levels are high enough to block the
neuron's voltage-gated Na+ channels? A. The neuron will exhibit a slow depolarization even before the stimulus is applied and then a normal action potential. B. The neuron will exhibit a slow hyperpolarization even before the stimulus is applied. C. The neuron will show a normal resting potential, but not exhibit depolarization when the stimulus is applied. D. The neuron will depolarize and exhibit rapid depolarization, but will not repolarize. E. The neuron will depolarize normally, but then become hyperpolarized such that the membrane potential is much lower than usual.
Why is the destruction of helper T cells caused by HIV infection so crippling to adaptive immunity? What will be an ideal response?