Genetics Unit: DNA Structure and Replication Quiz

What are the building blocks of nucleic acids?

• Fatty acids

• Amino acids

• Monosaccharides

• Nucleotides

Which component of a nucleotide is unique to each type?

• Hydrogen bond

• Nitrogenous base

• Sugar

• Phosphate group

What is the shape of DNA as described in the double helix model?

• Single strand

• Triple helix

• Circular strand

• Double helix

In DNA, which base pairs with adenine?

• Thymine

• Cytosine

• Guanine

• Uracil

How does RNA differ from DNA in terms of structure?

• RNA contains thymine

• RNA is a single strand

• RNA has a deoxyribose sugar

• RNA is a double helix

Which nitrogen base is found in RNA but not in DNA?

• Cytosine

• Thymine

• Adenine

• Uracil

What is the total number of chromosomes in human body cells?

• 23

• 37

• 46

• 74

What is a gene?

• A sugar molecule

• A section of DNA coding for a protein

• A type of RNA

• A complete chromosome

During which phase does DNA replication occur?

• G1 phase

• S phase

• G2 phase

• M phase

What is the nature of DNA replication?

• Semi-conservative

• Non-conservative

• Dispersive

• Conservative