DNA Structure and Replication

A strand of DNA consists of thousands of smaller, repeating units known as

• Lipids

• Amino Acids

• Nucleotides

• Carbohydrates

Which is the correct identification of the parts of the DNA nucleotide in the diagram shown?

• A =deoxyribose, B=guanine, C=phosphate

• A=phosphate, B=ribose, C=uracil

• A=thymine, B=deoxyribose, C=thymine

• A=deoxyribose, B=phosphate, C=thymine

If you discover that a DNA molecule contains 20% Thymine, how much Cytosine does this molecule contain based on Chargaff’s rule?

• 20%

• 25%

• 30%

• There is no way to tell

Which type of bond holds together two nitrogen bases in a DNA molecule?

• Metallic bonds

• Ionic bonds

• Covalent bonds

• Hydrogen bonds

Which of the following enzymes unwinds DNA and breaks hydrogen bonds?

• DNA polymerase

• Helicase

• Ligase

• RNA Primase

Which of the following enzymes add DNA bases to the original strand of DNA to create a new identical DNA polymer?

• DNA polymerase

• Helicase

• Ligase

• RNA Primase

Which of the following enzymes adds an RNA primer to the original strand of DNA to tell DNA polymerase where to begin adding new bases?

• DNA polymerase

• Helicase

• Ligase

• RNA primase

When and where does DNA replication happen?

• In the nucleus before cell division

• In the cytoplasm before cell division

• In the nucleus during cell division

• In the cytoplasm during cell division

Which point on this diagram would separate during DNA replication?

• A

• B

• C

• D

In a portion of a gene, the nitrogenous base sequence is T-C-G-A-A-T. Which nitrogenous base sequence would normally be found bonded to this section of the gene in DNA?

• A-C-G-T-A-A

• A-C-G-U-U-A

• A-G-C-T-T-A

• U-G-C-A-A-U