In DNA, the most important reason adenine does not ever pair up with cytosine is that:
a. There is a size problem that prevents pairing.
b. Adenine bonds with two hydrogen bonds, and cytosine bonds with threehydrogen bonds
c. Adenine bonds with three hydrogen bonds and cytosine bonds with two hydrogenbonds.
d. Adenine can occasionally bond with cytosine.
b
You might also like to view...
The living portion of the pathway through which water travels through a root is called the apoplastic pathway
a. True b. False
Where rivers slow and drop their sediment load they form deltas termed:
a. dendritic. b. coastal plain. c. tidal flats. d. sand bar. e. tombolos.
The injectable pain-killing drug called Prialt is an improvement over morphine-type drugs because it:
a. can easily be extracted from cone snails b. is less expensive to produce than morphine c. also removes the memory of pain from the affected person d. is not addictive e. is from invertebrates
Nearly every eukaryotic cell
A) has its genetic material concentrated in a membrane-enclosed nucleus. B) has a cell wall composed of cellulose that serves as the outer boundary of the cell. C) contains a hard, noncompressible fluid called the cytosol. D) possesses flagella and cilia, unlike prokaryotes. E) contains all of its genetic material in mitochondria.