Answers AISD-Biology A CR - 25-26DNA and RNA Structure

DNA and RNA Structure Answers

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Which discovery is attributed to Phoebus Levene?

extraction and observation of DNA

identification of ribose and deoxyribose

recognition of RNA as DNA’s messenger

construction of an accurate DNA model

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Which represents a strand of RNA bases?

TGGCTCGAA

UGGCUCGAA

GTTAGTGCC

CAATCTAGG

What is the role of RNA?

to provide the original blueprint for protein production

to move information from the ribosomes to the nucleus for protein synthesis

to break down proteins into amino acid monomers

to move information from the nucleus to the ribosomes for protein synthesis

What did Chargaff discover while studying bases in the DNA of organisms?

The bases in the DNA of each organism were unique.

The ratios of thymine and adenine were similar, as were the ratios of guanine and cytosine.

The overall percentages of bases were different from one organism to the next.

There were equal amounts of all four bases in every organism, or 25 percent of each base.

Proteins are made in ribosomes, but DNA is stored in the nucleus. How does RNA help in this process?

RNA copies DNA and transports it to ribosomes for protein synthesis.

RNA changes the DNA sequence to create new proteins.

RNA breaks down DNA so that proteins can be formed.

RNA helps in the replication of DNA before protein synthesis.

Why can uracil be used as a “clue” to identify RNA in a strand?

Because uracil is found in both DNA and RNA.

Because uracil indicates a damaged DNA strand.

Because uracil is always paired with thymine.

Because uracil is unique to RNA.

Which structural characteristic is seen in RNA but not in DNA?

double strands

a single strand

chains of nucleotides

a helical shape

A single strand of DNA helix has the code ATAGGC. Which would be the complementary code on the other strand of the helix?

AUACCG

CGCTTA

GCGAAT

TATCCG

The diagram shows a nucleic acid in the shape of a double helix.Which sugar is present in the nucleic acid that is represented in the diagram?

phosphate

uracil

deoxyribose

ribose

DNA is a nucleic acid polymer composed of which repeating structural unit?

nucleotides

phosphate groups

ribosomes

proteins

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DNA and RNA Structure Answers

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