Although Sulfolobus solfataricus grows at pH 2 to 4, it maintains a cytoplasmic pH of about 2, thereby generating a large pH gradient across the plasma membrane.
Answer the following statement true (T) or false (F)
False
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Mendel performed reciprocal crosses in which he used pollen from a white-flowered plant to fertilize a purple-flowered plant and pollen from a purple-flowered plant to fertilize a white-flowered plant. What did these reciprocal crosses demonstrate?
A. The female gamete made a larger genetic contribution to the offspring than the male gamete. B. Each parent made an equal genetic contribution to the offspring. C. Flower color is a sex-linked trait. D. The traits of flower color and sex assort independently. E. The male gamete made a larger genetic contribution to the offspring than the female gamete.
Consider the following excerpt of a figure from your text (Fig 31.9). Keep in mind that auxin retains or loses a proton depending on its location in the plant stem
For each of the following statements, indicate (by placing a letter in the blank) whether after an auxin molecule has diffused into a cell it would then move a. away from the meristem b. toward the meristem c. have no movement in any direction PIN proteins are located on the apical side of the cell membrane only _____ What will be an ideal response?
What would a nerve poison that blocked neurotransmitter receptors on the dendrites do?
A) It would cause continued stimulation of the membrane of the receiving neuron. B) It would prevent transmission across the synaptic cleft. C) It would inhibit the regeneration of neurotransmitter for use by the synaptic knobs. D) It would inactivate the enzyme that degrades the neurotransmitter.
The islets of Langerhans are in the ________ and produce ________.
A. stomach; hydrochloric acid B. liver; bile C. stomach; intrinsic factor D. pancreas; insulin E. mouth; saliva