1.Which are pyrimidines? A. Any base with a double-ring structure B. Adenine and
ID: 212480 • Letter: 1
Question
1.Which are pyrimidines?
A. Any base with a double-ring structure B. Adenine and Guanine C. Thymine and Cytosine D. Adenine and Thymine
2. A phosphodiester bond:
A. is between complementary bases. B. holds the two strands together and is easily broken by heat. C. is between the sugar and phosphate group, in the DNA backbone.
3. A nucleotide is made of:
A. complementary nitrogenous bases. B. a sugar and nitrogenous base. C. a sugar, nitrogenous base, and phosphate group.
4.How do the sugars of DNA and RNA differ?
A. RNA sugar has six carbons DNA sugar has five carbons B. RNA sugar has –OH at the 2’ and 3’ carbon DNA sugar has –OH at 3’ but not 2’ C. RNA sugar has a phosphate group and DNA sugar does not
5. Which facet of DNA structure most directly facilitates its capacity for information storage?
A. double-stranded with complementary bases B. variations in the base sequence C. right-handed helix 4. antiparallel
6.Which facet of DNA structure most directly facilitates its capacity for replication?
A. double-stranded with complementary bases B. variations in the base sequence C. right-handed helix D. antiparallel In a molecule of double-stranded DNA, the percentage of guanine is 30%.
7.What is the percentage of Thymine?
A. 20% B. 30% C. 40% D. 60%
Explanation / Answer
As per Chegg Policy, proceeding to answer only the first 4 parts/subparts:
1. Which are pyrimidines:
C. Thymine and Cytosine
2. A phosphodiester bond:
C. is between the sugar and phosphate group, in the DNA backbone.
3. A nucleotide is made of:
C. a sugar, nitrogenous base, and phosphate group.
4.How do the sugars of DNA and RNA differ:
B. RNA sugar has –OH at the 2’ and 3’ carbon DNA sugar has –OH at 3’ but not 2’
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