07_Molecular Biology of the Gene part 1

What is the structure of DNA according to the Watson-Crick model?

• Triple helix with a lipid layer

• Double helix with a sugar-phosphate backbone

• Circular structure with no backbone

• Single strand with a protein backbone

Which enzyme is responsible for adding nucleotides during DNA replication?

• DNA ligase

• DNA polymerase

• RNA polymerase

• - Helicase

What type of mutation results from a nucleotide substitution that does not change the amino acid sequence?

• Missense mutation

• Frameshift mutation

• Nonsense mutation

• Silent mutation

What is the role of RNA polymerase in gene expression?

•  Synthesis of proteins from RNA

• Repairing DNA strands

• Joining nucleotides in DNA replication

• Synthesis of RNA from DNA

What is the role of RNA polymerase in gene expression?

• - Synthesis of proteins from RNA

• - Repairing DNA strands

• Joining nucleotides in DNA replication

• Synthesis of RNA from DNA

Which of the following is a component of ribosomal RNA (rRNA)?

• Carries amino acids to the ribosome

• Transcribes DNA into RNA

• Codes for proteins directly

• Part of the ribosome structure

What is the function of transfer RNA (tRNA) during translation?

• Brings amino acids to the ribosome

• Synthesizes RNA from DNA

• Forms the ribosome structure

• Replicates DNA strands

Which base pairs with adenine (A) in DNA?

• Cytosine (C)

• Uracil (U)

• Thymine (T)

• Guanine (G)

What is the primary function of DNA ligase during DNA replication?

• Synthesizes RNA from DNA

• Links short DNA fragments together

• Adds nucleotides to the growing DNA strand

• Unwinds the DNA double helix

What type of RNA carries the genetic information from DNA to the ribosome?

• Nuclear RNA (nRNA)

• Ribosomal RNA (rRNA)

• Messenger RNA (mRNA)

• Transfer RNA (tRNA)