A thermal inversion occurs when a warm stagnant air mass traps a cooler air mass containing smog beneath it
Indicate whether the statement is true or false
TRUE
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About half of all miscarriages are caused by ____
a. chromosomal abnormalities b. alcohol use during pregnancy c. cleft palate d. tobacco use during pregnancy e. illegal drug use during pregnancy
____________________ T cells secrete interleukins that activate other cells in both the cell-mediated and antibodymediated
immune responses. Fill in the blank(s) with the appropriate word(s).
While on the voyage of the HMS Beagle, Darwin:
a) wrote Origin of Species. b) studied Malthus's book Essay on the Principle of Population. c) discovered a love of sea travel. d) corresponded extensively with Alfred Russel Wallace about their ideas on evolution. e) nurtured his love of studying nature, exploring plant and animal diversity, and collecting fossils.
How do the strands separate during PCR?
a. The primers separate the strands during the annealing step. b. The DNA polymerase breaks the hydrogen bonds between the two strands. c. The cycling of the temperatures breaks the hydrogen bonds between the two strands. d. The high heat of the denaturation step breaks the hydrogen bonds between the two strands.