1. Answer the following questions: a. Which three nucleic acid bases are common
ID: 217008 • Letter: 1
Question
1. Answer the following questions:
a. Which three nucleic acid bases are common to both DNA and RNA?
b. RNA differs from DNA in one nucleotide. DNA contains ________, RNA contains _____________.
c. The two strands of the double-helix run ____________ to each other.
d. In a DNA double helix the nucleotides of one strand are connected with the nucleotides of the other strand by what kind of bonds?
e. There are ____ hydrogen bonds between guanine and cytosine and _____ hydrogen bonds between adenine and thymine.
f. If the DNA strand 5' -GTCATGAC-3' is the template for replication, what would be the base sequence and polarity of the complementary strand? Indicate in which direction the new strand is synthesized (draw an arrow).
Explanation / Answer
a. Adenine, guanine and Cytosine is found in both DNA and RNA, but thymine is only found in DNA and uracil is only found in RNA.
b. RNA differs from DNA in one nucleotide. DNA contains thymine, RNA contains uracil.
c. The two strands of the double-helix run antiparallel(run in opposite directions) to each other.
d. In a DNA double helix the nucleotides of one strand are connected with the nucleotides of the other strand by phosphodiester bonds.
e. There are Three (3) hydrogen bonds between guanine and cytosine and Two (2) hydrogen bonds between adenine and thymine.
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