If a double stranded piece of DNA is amplified by PCR then after 4 cycles there would be _____ copies of this DNA
1.2
2.4
3.8
4.16
5.32
5
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In a pond, tadpoles eat algae and fish eat the tadpoles. Above the pond, grasshoppers eat grass and, at night, are preyed upon by bats. Other bats eat the fish that eat the tadpoles. In this community, the algae are:
A. primary producers. B. primary consumers. C. secondary consumers. D. tertiary consumers. E. detritivores.
The outbreak of measles within the last few years was due to
A. mutation of the virus. B. change in the environment. C. a decline in vaccination of children in the previous years. D. increase in sensitivity of detection techniques.
Which pair of traits is homologous?
a. butterfly wings and bat wings b. the surfaces of bird and bat wings c. the skeletons of bird and bat wings d. butterfly wings and bird wings e. bird wings and bat wings
A male expresses
A. only the homozygous recessive alleles on his X chromosome. B. none of the alleles on his X chromosome. C. only the dominant alleles on his X chromosome. D. both the dominant and recessive alleles on his X chromosome. E. None of the answer choices is correct.