The sodium leak channels in photoreceptors are cyclic GMP-gated channels. What must occur during activation of photoreceptor cells by light?
A. Cyclic GMP levels are reduced.
B. Cyclic GMP levels are increased.
C. Cyclic GMP is exchanged for cyclic AMP.
D. Cyclic GMP is exchanged for GTP.
A
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The organic matter in soil is referred to as
A. mineral soil. B. inorganic substance. C. bedrock. D. humus.
In MacArthur and Wilson's island biogeography model, species richness is a balance between
A. immigration and extinction. B. inhibition and facilitation. C. emigration and speciation. D. tolerance and inhibition. E. speciation and extinction.
A channel that opens in response to changes in ionic charge across a membrane is called a(n) ____ channel
a. voltage-gated b. ligand-gated c. charge-gated d. electric-gated e. positive-gated
Following S phase, a human cell would have how many pairs of sister chromatids and individual DNA molecules?
A. 23 pairs of sister chromatids and 92 individual DNA molecules B. 46 pairs of sister chromatids and 46 individual DNA molecules C. 46 pairs of sister chromatids and 184 individual DNA molecules D. 46 pairs of sister chromatids and 92 individual DNA molecules E. 23 pairs of sister chromatids and 46 individual DNA molecules