Observe the figure below. Can you make any conclusions about the spreading of zebra
mussels throughout the country?
C
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Which of the following is true of the cloning experiment that resulted in Dolly the sheep?
A) Dolly was genetically identical to the egg-cell donor. B) Dolly was cloned by fusing an egg with an embryonic stem cell. C) Dolly was infertile, which indicated incomplete nuclear reprogramming. D) Dolly was cloned by using a differentiated cell fused to an egg from another breed of sheep. E) Dolly was cloned by fusing the nuclei from two separate eggs harvested from the same individual.
Which of the following is a common reason for hybrid infertility?
a. They express mechanical incompatibility. b. They are found to be ecologically isolated. c. A common reason for hybrid infertility is the failure of chromosomes to pair properly during meiosis. d. They fail to reach sexual maturity.
Examine the flux diagrams in Figure 25.6 to address the following questions. What is the difference in the rate of carbon exchange (in gigatons per year of carbon) between photosynthesis and respiration in the marine environment?
What will be an ideal response?
CREB is activated by
a. cAMP binding in the nucleus. b. phosphorylation by protein kinase A in the nucleus. c. cAMP binding in the cytoplasm. d. phosphorylation by protein kinase A in the cytoplasm.