Gene Expression Quiz

What is the role of RNA in gene expression?

• RNA is a type of protein.

• RNA is responsible for DNA replication.

• RNA is the bridge between genes and the proteins for which they code.

• RNA is the genetic material of cells.

Where does transcription take place in eukaryotic cells?

• In the cytoplasm

• In the mitochondria

• In the ribosome

• In the nucleus

What is the function of RNA polymerase?

• It synthesizes RNA using information in DNA.

• It synthesizes DNA from RNA.

• It translates mRNA into proteins.

• It processes RNA transcripts.

A particular triplet of bases in the template strand of DNA is 5′-AGT-3′. What would be the corresponding codon for the mRNA that is transcribed?

• 3′-UCA-5′

• 3′-UGA-5′

• 5′-TCA-3′

• 3′-ACU-5′

Which of the following molecular structures contain codons?

• tRNA

• mRNA

• rRNA

• A protein

The genetic code is redundant. What is meant by this statement?

• More than one codon can specify the addition of the same amino acid.

• The genetic code is universal (the same for all organisms).

• The genetic code is different for different domains of organisms.

• A single codon can specify the addition of more than one amino acid.

Which of the following processes occurs in eukaryotic gene expression?

• RNA polymerase requires tRNA to elongate the molecule.

• mRNA, tRNA, and rRNA are translated.

• RNA polymerase binds to the terminator sequence.

• A cap is added to the 5′ end of the mRNA.

Which one of the following structures, if missing, would usually prevent translation from starting?

• AUG codon

• Poly-A tail

• 5′ cap

• Exon

What is the central dogma of molecular biology?

• Protein → RNA → DNA

• DNA → RNA → protein

• DNA → protein → RNA

• RNA → DNA → protein

How is it possible for so many different proteins to be made from only 20 amino acids?

• Proteins are made from different combinations and sequences of the 20 amino acids.

• Amino acids can change their structure to form different proteins.

• Each amino acid can form multiple types of proteins.

• Proteins are not made from amino acids.