When do sister chromatids separate in meiosis?
A. anaphase 1
B. metaphase 2
C. anaphase 2
D. telophase 1
C
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The transformation frequency of very competent cells is about 10-6, or about 1 in 1,000,000 when an excess of DNA is used.
Answer the following statement true (T) or false (F)
Prostaglandins are not
A) endocrine hormones. B) important in smooth muscle function. C) paracrine hormones. D) stimulators of inflammation. E) formed from arachidonic acid.
Summarize the usefulness of the online catalog of human genetic traits developed and maintained by researchers at Johns Hopkins University
What will be an ideal response?
Which statement is false?
a. The stomata open simply to allow carbon dioxide to enter the leaf, not as a result of environmental conditions. b. As carbon dioxide levels drop in guard cells, there is an influx of potassium. c. When potassium ions enter guard cells, water moves into the guard cells by osmosis. d. At night, in most plants carbon dioxide builds up in guard cells, resulting in the movement of potassium and water out of the guard cells. e. When the guard cells shrivel, the stomata are closed.