Which statement is true?
1.The hydrogen bonding of cytosine to guanine is an example of complementary base pairing.
2.Adenine always pairs up with guanine in DNA, and cytosine always teams up with thymine.
3.Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base.
4.When adenine base pairs with thymine, they are linked by three hydrogen bonds.
5.In the DNA of all species, the amount of cytosine never equals the amount of guanine.
1
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The primary disadvantage of an osmoregulator strategy is
A. pumping ions into or out of the body is energetically expensive. B. pumping ions into or out of the body is not a significant energetic expense usually. C. keeping relatively constant internal conditions deprives the central nervous system of critical information about the environment. D. pumping water into or out of the body is energetically expensive. E. physiological systems do not typically perform well under relatively constant conditions.
At sea level the air pressure which equals 1 atmosphere is
A) 150 mm Hg. B) 100 mm Hg. C) 600 mm Hg. D) 500 mm Hg. E) 760 mm Hg.
Microsporocytes divide by ____ to form ____
a. meiosis; megapores b. mitosis; endospores c. mitosis; microspores d. meiosis; microspores e. meiosis; endospores
Which component of the Calvin cycle is recycled, and why is this important for the Calvin cycle?
What will be an ideal response?