The PCR technique doubles the amount of DNA in a sample in each cycle. If you started the PCR technique with two fragments of double-stranded DNA, calculate how many double-stranded DNA fragments you would you have after four cycles.
A. 16
B. 64
C. 32
D. 8
Answer: C
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______ are often mistaken for palm trees because of their leaf shape but bear large cones and are under threat of extinction.
a. Conifers b. Ginkophytes c. Cycads d. Gnetophytes
Natural selection in the cichlid fish species of Lake Victoria occurred via ____
a. extinction b. phylogeny c. cladistics d. macroevolution e. microevolution
Four of the five phrases below are true of Darwin
and his voyage. Select the exception. a. lasted five years b. wrote final draft of book on species c. sailed aboard the H.M.S. Beagle d. embarked from England when he was 22 years old e. visited the mainland of South America
Vestigial structures _________________.
a. are essential for an organism to live b. have no known function c. cause reproductive isolation d. cause sympatric speciation