Muscles that are constantly active, such as those maintaining our body posture, have a high proportion of
A) fast, fatigue-resistant fibers.
B) fast, fatigue-susceptible fibers.
C) slow, fatigue-resistant fibers.
D) slow, fatigue-susceptible fibers.
Answer: C
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Why does the polymerase chain reaction require the samples to undergo numerous cycles, each
containing three different temperatures?
a. The initial cycles don't produce many copies of the original gene since the amplification is exponential in nature. b. The three temperatures are for different processes; the highest temperature separates the double stranded DNA into single strands, the lower temperatures allow a target primer to bind and a DNA polymerase to generate new sequences. c. The enzyme used is from an organism that thrives in high temperatures, so high temperatures must be used. d. Non-target DNA is made during the first 10 cycles so further cycles are required to specifically amplify the target DNA. e. Once the enzyme starts working, you cannot stop the reaction until there are no more nucleotides.
Which of the following terms includes all of the others in the list?
a. fern b. seed plant c. gymnosperm d. vascular plant e. angiosperm
Some microbes are not capable of growing on artificial media.
Answer the following statement true (T) or false (F)
Gene flow is restricted between subspecies because of some extrinsic barrier, such as rivers or mountain ridges
Indicate whether the statement is true or false