Biochemistry 4116 TA Practice Quizzes - Practice Quiz 1

Nucleotides are made of:

• a sugar, a phosphate group, and a nitrogenous base

• two sugars and a fatty acid

• an amino acid and a phosphate group

• a lipid and a nitrogenous base

Which of the following correctly states three differences between prokaryotic and eukaryotic DNA?

• Prokaryotic DNA is circular, not enclosed in a nucleus, and usually has a single chromosome; eukaryotic DNA is linear, enclosed in a nucleus, and has multiple chromosomes.

• Prokaryotic DNA is linear, found in a nucleus, and has multiple chromosomes; eukaryotic DNA is circular, not enclosed in a nucleus, and has a single chromosome.

• Prokaryotic DNA is double-stranded, found in mitochondria, and has histones; eukaryotic DNA is single-stranded, found in cytoplasm, and lacks histones.

• Prokaryotic DNA is found in chloroplasts, is linear, and has introns; eukaryotic DNA is circular, found in the nucleoid, and lacks introns.

The diagram shows the structure of which molecule?

• Adenosine

• Sucrose

• Thymidine

• Guanosine

Tags

NGSS.HS-LS1-6

Which of the following correctly pairs the base type with its classification?

• A. Adenine – Pyrimidine

• B. Uracil – Purine

• C. Guanine – Purine

• D. Thymine – Purine

Which bond links the sugar and base in a nucleoside?

• Phosphodiester bond

• Hydrogen bond

• Peptide bond

• Glycosidic bond

What is the correct direction of DNA synthesis?

• 3’ to 5’

• 5’ to 3’

• Both directions simultaneously

• Random

The difference in sugars between DNA and RNA is that DNA contains __________ and RNA contains __________.

• DNA contains deoxyribose and RNA contains ribose.

• DNA contains ribose and RNA contains deoxyribose.

• DNA contains glucose and RNA contains fructose.

• DNA contains sucrose and RNA contains maltose.

The pairing of adenine with thymine and guanine with cytosine in DNA is due to __________ bonding.

• hydrogen

• ionic

• covalent

• metallic

The role of phosphoric acid in the formation of nucleotides is:

• to form the backbone by linking sugars together

• to provide energy for nucleotide synthesis

• to act as a nitrogenous base

• to catalyze the formation of nucleotides

DNA is considered more stable than RNA because:

• it lacks the 2'-hydroxyl group present in RNA, making it less prone to hydrolysis.

• it contains uracil instead of thymine.

• it is single-stranded, unlike RNA.

• it is more reactive due to its structure.