DNA and RNA Structure Answers
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The diagram shows a nucleic acid in the shape of a helix.Which sugar is present in the nucleic acid that is represented in the diagram?
A
uracilB
thymineC
deoxyriboseD
ribose2
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On an RNA molecule, which would base pair with adenine?
A
thymineB
guanineC
cytosineD
uracil3
Which structural characteristic is seen in RNA but not in DNA?
A
double strandsB
a single strandC
chains of nucleotidesD
a helical shape4
Proteins are made in ribosomes, but DNA is stored in the nucleus. How does RNA help in this process?
A
RNA copies DNA and transports it to ribosomes for protein synthesis.B
RNA changes the DNA sequence to create new proteins.C
RNA breaks down DNA so that proteins can be formed.D
RNA helps in the replication of DNA before protein synthesis.5
Which structural component is found in DNA but not in RNA?
A
riboseB
deoxyriboseC
phosphate groupD
nitrogenous base6
Which of the following could be a nucleotide of RNA?
A
deoxyribose + phosphate group + thymineB
deoxyribose + phosphate group + uracilC
ribose + phosphate group + thymineD
ribose + phosphate group + uracil7
Which base is found only in RNA?
A
riboseB
thymineC
uracilD
deoxyribose8
Which discovery is attributed to Phoebus Levene?
A
extraction and observation of DNAB
identification of ribose and deoxyriboseC
recognition of RNA as DNA’s messengerD
construction of an accurate DNA model9
Why can uracil be used as a “clue” to identify RNA in a strand?
A
Because uracil is found in both DNA and RNA.B
Because uracil indicates a damaged DNA strand.C
Because uracil is always paired with thymine.D
Because uracil is unique to RNA.10
What did Chargaff discover while studying bases in the DNA of organisms?
A
The bases in the DNA of each organism were unique.B
The ratios of thymine and adenine were similar, as were the ratios of guanine and cytosine.C
The overall percentages of bases were different from one organism to the next.D
There were equal amounts of all four bases in every organism, or 25 percent of each base.Did you find these answers helpful?
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