Nucleic Acids

What are the three parts of a DNA nucleotide?

• Ribose sugar, phosphate, nitrogenous base

• Deoxyribose sugar, phosphate, nitrogenous base

• Ribose sugar, phosphate, phosphorous base

• Deoxyribose sugar, phosphate, phosphorous base

Which nitrogenous bases are purines?

• Adenine, guanine and uracil

• Adenine and guanine

• Thymine, uracil and adenine

• Thymine and cytosine

How many hydrogen bonds form between adenine and thymine?

• 2

• 3

• 4

What describes when the two chains of DNA run in opposite directions?

• Parallel

• Concurrent

• Antiparallel

In DNA replication, what enzyme unzips the DNA?

• DNA gyrase

• DNA helicase

• DNA polymerase

Which scientists discovered that DNA replication is semi conservative?

• Meselson and Franklin

• Watson and Crick

• Chargaff and Stahl

• Meselson and Stahl

If a molecule of DNA contains 34% Adenine, what percentage of it is Guanine?

• 34%

• 32%

• 16%

• 68%

What is the complementary strand of AAATGCTTTAAC

• TTTACGAAATTC

• TTTAGGAAATTC

• TTTACGTTTAAG

• TTTACGAAATTG

During which phase of mitosis does DNA replicate?

• G1

• G2

• S

• M

What type of bonds are between the bases?

• Covalent

• Hydrogen

• Ionic

• Phosphodiester