DNA Basics

In DNA, adenine pairs up with thymine and guanine with cytosine. If adenine makes up 40% of the bases in DNA, then what percentage of the bases in DNA does cytosine make up?

• 10%

• 20%

• 40%

• 50%

What did Rosalind Franklin contribute to the understanding of DNA molecules?

• An image indicating the shape of a DNA molecule

• An analysis of the chemical makeup of a DNA molecule

• A theory about how DNA conveys genetic information

• A thought that DNA carries genetic information

Sarah is building a model of a strand of DNA. She should show that the nucleotides are linked by covalent bonds between

• Two nitrogenous bases

• Nitrogenous bases and phosphate

• Nitrogenous bases and sugar

• Phosphate and sugar

The illustration below represents a section of a DNA molecule. From left to right, what are the components of each nucleotide?

• Phosphate group, nitrogenous base, deoxyribose

• Nitrogenous base, phosphate group, deoxyribose

• Nitrogenous base, deoxyribose, phosphate group

• Phosphate group, deoxyribose, nitrogenous base

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What is the relationship between DNA and protein in a cell?

• Protein is composed of DNA that is stored in the cell.

• DNA is made up of proteins that are synthesized in the cell.

• DNA controls the production of protein in the cell.

• The cell is composed only of DNA and protein.

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