Which concept(s) for identifying species CANNOT be applied to asexual or fossil species?
A. Biological species concept
B. Phylogenetic species concept
C. Morphospecies concept
D. All of the above.
Answer: A. Biological species concept
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When a photon is absorbed by a pigment (light-absorbing molecule), such as chlorophyll, the energy of the photon is transferred to
A) D1 protein to activate PSII. B) ATP synthase to make ATP. C) an electron to move it from a low to a high energy orbital. D) Plastocyanin to be passed on to PSI. E) NADP+ to make NADPH.
Protein kinase A regulates glycogen metabolism by _______ glycogen synthase and _______ glycogen phosphorylase.
a. activating; activating b. inactivating; inactivating c. activating; inactivating d. inactivating; activating
What is the correct sequence for a Gram stain?
A. crystal Violet, Safranin, Alcohol, Gram's iodine B. safranin, Crystal Violet, Gram's iodine, Alcohol C. alcohol, Crystal Violet, Safranin, Gram's iodine D. Gram's iodine, Crystal Violet, Alcohol, Safranin E. crystal Violet, Gram's iodine, Alcohol, Safranin
The hormone FSH stimulates the development of a follicle in the human female. As the follicle develops, it secretes estrogen. A high level of estrogen decreases the secretion of FSH. This mechanism is an example of
A. cell differentiation B. in vitro fertilization C. positive tropism D. negative feedback