DNA Structure and Replication Quiz

What is the structure of DNA?

• Single strand

• Double helix

• Triple helix

• Circular strand

Which enzyme is responsible for unzipping the DNA strands during replication?

• Ligase

• Helicase

• DNA Polymerase

• Leading Strand

What is the base-pairing rule in DNA?

• A pairs with G, T pairs with C

• A pairs with T, C pairs with G

• A pairs with C, T pairs with G

• A pairs with T, G pairs with T

What is the role of DNA Polymerase in DNA replication?

• Unzips the DNA strands

• Adds new nucleotides to form the new strand

• Joins the fragments together

• Makes short pieces of DNA

What does the term "semi-conservative" mean in DNA replication?

• Each new DNA molecule has two old strands

• Each new DNA molecule has one old strand and one new strand

• Each new DNA molecule has two new strands

• Each new DNA molecule has alternating old and new strands

What is the role of RNA in transcription?

• RNA is a double-stranded molecule that stores genetic information.

• RNA is a single-stranded molecule that helps make proteins.

• RNA is a molecule that directly codes for amino acids.

• RNA is a molecule that breaks down DNA during transcription.

Which base pairs with uracil (U) in RNA during transcription?

• Adenine (A)

• Cytosine (C)

• Guanine (G)

• Thymine (T)

What happens to mRNA during RNA processing in eukaryotes before leaving the nucleus?

• mRNA is directly translated into proteins.

• Introns are removed, and a cap and tail are added.

• mRNA is converted into DNA.

• mRNA is broken down into amino acids.

What is the function of tRNA during translation?

• tRNA copies DNA into mRNA.

• tRNA brings amino acids to the ribosome.

• tRNA signals the end of translation.

• tRNA removes introns from mRNA.

How do plasmids contribute to genetic variation?

• Plasmids are responsible for transcription in bacteria.

• Plasmids are created by mutations or gene transfer between organisms.

• Plasmids directly code for ribosomal proteins.

• Plasmids remove introns from mRNA in bacteria.