Transcription starts at a region of DNA called a(n)
a. sequencer.
b. promoter.
c. activator.
d. terminator.
e. transcriber.
Answer: b
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The technique known as ________ relies on the fact that although the PCR fragments are about the same ________, they differ in ________. The DNA denaturing rate on a gel then varies with the ________ content, DNA sequence, and chemical gradient. Hence, similar fragments can be separated and identified.
What will be an ideal response?
During muscle contractions,
a. the sarcomeres shorten. b. the actin filaments slide over the myosin filaments. c. the actin filaments move toward the middle of the sarcomere during contraction and away on relaxation. d. the muscle fibers thicken. e. all of these occur.
One purpose of the lymphatic system is to:
a. transport nutrients and oxygen. b. drain excess fluid from connective tissues. c. block the transport of blood proteins. d. produce red blood cells. e. deliver carbon dioxide to the heart
Which mechanism would prevent interbreeding between two species of fish living in the same habitat?
a. sympatric isolating mechanisms b. allopatric isolating mechanisms c. equilibrium isolating mechanisms d. reproductive isolating mechanisms e. preadaptive isolating mechanisms