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Protein Synthesis Answers

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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

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Which structural component is found in DNA but not in RNA?

ribose

deoxyribose

phosphate group

nitrogenous base

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

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?

uracil

thymine

deoxyribose

ribose

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

double strands

a single strand

chains of nucleotides

a helical shape

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

nucleotides

phosphate groups

ribosomes

proteins

Which base is found only in RNA?

ribose

thymine

uracil

deoxyribose

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 represents a strand of RNA bases?

TGGCTCGAA

UGGCUCGAA

GTTAGTGCC

CAATCTAGG

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.

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Protein Synthesis Answers

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