A field experiment gives the investigator much more control over the environmental conditions than does a laboratory experiment
Indicate whether the statement is true or false
FALSE
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You isolate the DNA from a previously unknown virus and determine the melting point of the nucleic acid in the virus. What pattern, trace A, B, C, or D,would you expect if the virus DNA is single stranded?
A. trace A B. trace B C. trace C D. None of these traces represents the pattern forsingle-stranded DNA.
The molecule of chlorophyll a in photosystem II's reaction center is known as P680 because
a. it absorbs 680 photons per minute. b. it absorbs photons with a wavelength of 680 nm. c. there are exactly 680 accessory pigments in the photosystem. d. it will generate 680 molecules of ATP per photon absorbed. e. there are 680 electrons that can be energized by light.
A deletion of one base pair that alters the sequence of codons is called a(n)
A. frameshift mutation. B. oncogene. C. substitution mutation. D. transposon. E. carcinogen.
Among children with parents who are both carriers of Tay-Sachs, an autosomal recessive disorder, chances are that
a. 75 percent will be carriers. b. 50 percent will die in a few years. c. 75 percent will not carry the recessive Tay-Sachs's allele. d. 50 percent will be carriers.