Why would a scientist use DNA fingerprinting to answer a question about human migration?
A) to determine what race a person belongs to
B) to determine the paternity of an individual
C) to determine the frequency of a particular allele in different populations
D) to determine whether a recessive allele gave an advantage in a particular environment
C
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Why aren't ferns commonly found in deserts?
A. Fern fronds are sensitive to UV light. B. Fern spores are unable to resist prolonged dry conditions. C. Ferns are non-vascular and cannot absorb water from deep within the soil. D. Fern pollen is spread by insects that do not occur in deserts.
Which phylum of worms includes the leeches?
A) Flatworms B) Annelids C) Roundworms D) None of the above
Which of the tools below is used to cut the gene from its normal location?
A. restriction enzyme B. plasmid C. bacteriophage D. vector
Melatonin is secreted by the_____
A) hypothalamus during the day B) pineal gland during the night C) autonomic nervous system during the winter D) posterior pituitary gland during the day