A human blastomere is _____
A) an embryonic cell that is smaller than the ovum
B) an embryonic structure that includes a fluid-filled cavity
C) that part of the acrosome that opens the egg's membrane
D) a component of the zona pellucida
E) a cell that contains a (degenerating) second polar body
Answer: A
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Provide a reason for the ecological importance of pelagic Bacteria and Archaea
What will be an ideal response?
In a large population on a Pacific island, a few individuals had a mutation that caused them to have
different colored eyes. After a hurricane, the population was reduced to only a few individuals, but some of those individuals had the rare eye color mutation. Now, after many generations, almost half of the population on this island has different colored eyes. This is an example of _____________. Fill in the blank(s) with the appropriate word(s).
Simple diffusion of molecules occurs ________.
a. from an area of lesser concentration to an area of greater concentration b. in non-living systems as well as living systems c. across plasma membranes only through transport proteins
The scientific method involves each of the following EXCEPT
A. systematic search for information. B. observation and experimentation. C. forming and testing possible solutions. D. formulation of laws and principles that control the observed facts.