DNA and RNA Review

What stores information in a cell?

• proteins

• carbohydrates

• lipids

• DNA

What happens when a piece of DNA is missing?

• Genetic information is stored.

• Genetic information is copied.

• Genetic information is lost.

• Genetic information is transmitted.

Figure 12–2 shows the structure of

• a DNA molecule

• an amino acid

• a RNA molecule

• a protein

Which of the following is a nucleotide found in DNA?

• adenine + phosphate group + thymine

• cytosine + phosphate group + guanine

• deoxyribose + phosphate group + polymerase

• deoxyribose + phosphate group + cytosine

Because of base pairing in DNA, the percentage of

• adenine molecules in DNA is about equal to the percentage of guanine molecules.

• thymine molecules in DNA is about equal to the percentage of adenine molecules.

• adenine molecules in DNA is much greater than the percentage of thymine molecules.

• cytosine molecules in DNA is much greater than the percentage of guanine molecules.

The table in Figure 12–3 shows the results of measuring the percentages of the four bases in the DNA of several different organisms. Some of the values are missing from the table. Based on Chargaff’s base-pairing rule, the percentages of adenine bases in human DNA should be around

• 28.8%

• 19.9%

• 29.4%

• 13.4%

The table in Figure 12–4 shows the percentages of bases in a DNA sample. How much Cytosine should you expect to find in the sample?

• 22%

• 24%

• 28%

• 44%

What would happen to the percentage of G in Figure 12–4 if the percentage of A rose to 25%?

• G would drop to 19%

• G would drop to 25%

• G would rise to 29%

• G would rise to 32%

Which of the following forms a base pair with thymine?

• deoxyribose

• adenine

• guanine

• cytosine

DNA replication results in two DNA molecules,

• each with two new strands.

• one with two new strands and the other with two original strands.

• each with one new strand and one original strand.

• each with two original strands.