How does the C. elegans gene lin4 control the expression of lin14?
What will be an ideal response?
Ans: lin4 is transcribed to an miRNA that is complementary to, and base-pairs with, the 3? UTR of the lin14 transcript, inhibiting its expression.
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Which of the following lowers the efficiency of plants' conversion of sunlight into chemical energy?
A. UV light B. UV light and O2 C. UV light, O2, and heat dissipation D. O2 and heat dissipation E. UV light and heat dissipation
Which of the choices lists the three phases of the ovarian cycle in the correct order?
A. follicular, luteal, ovulation B. follicular, proliferative, secretory C. luteal, ovulation, secretory D. follicular, ovulation, luteal E. luteal, secretory, ovulation
Which of the following describes the role of urinary systems in maintaining cellular homeostasis?
A) Urinary systems filter out diseased and damaged cells that can be excreted from the body. B) Urinary systems regulate water balance, pH, and the concentrations of ions in body fluids for cells. C) Urinary systems ensure the delivery of the proper amount of nitrogen to the cells. D) Urinary systems are important for the generation of urea, which cells can use as an energy source when carbohydrates become scarce.
Nodes of Ranvier are the spaces between sections of axon enwrapped with myelin. Because myelin creates an insulating layer that prevents ion flow, the progress of the action potential "jumps" from node to node, thus speeding up transmission down the axon.You are studying a gene that, when mutant, causes oligodendrocytes to enwrap shorter sections of axon, so that nodes of Ranvier are more closely spaced. What is the likely effect on nerve impulses?
A. They will travel slower. B. They will decrease in amplitude. C. They will travel laterally across connected axons. D. They will travel faster. E. They will increase in amplitude.