Unit 4: Gene Expression.1

What does the genome of an organism comprise?

• Only non-coding DNA

• All the genetic material in the chromosomes

• Only the structural genes

• Only the DNA found in the nucleus

What is the role of mRNA in protein synthesis?

• It acts as a catalyst in biochemical reactions

• It transfers the genetic code from DNA to the ribosome

• It helps in the replication of DNA

• It carries amino acids to the ribosome

Which of the following is NOT a function of non-coding DNA?

• Producing RNA

• Adding end caps to chromosomes

• Regulating gene expression

• Coding for proteins

What is a codon?

• A type of mutation in the DNA

• A sequence of three amino acids

• A sequence of three nucleotides in mRNA that codes for an amino acid

• A type of protein

What process describes the synthesis of mRNA from DNA?

• Transcription

• Replication

• Translation

• Mitosis

Which molecule carries an amino acid to the ribosome during translation?

• tRNA

• rRNA

• DNA

• mRNA

What is the function of exons?

• They protect the ends of chromosomes

• They are removed from mRNA during splicing

• They encode parts of the final mature RNA

• They link sister chromatids together

What is the role of telomeres?

• They protect the ends of chromosomes

• They code for proteins

• They carry amino acids

• They help in the replication of DNA

Which of the following is true about the genetic code?

• It is always unambiguous

• It is overlapping

• It consists of doublets

• It is degenerate

What happens during the splicing process of mRNA?

• mRNA is transported out of the nucleus

• Introns are removed and exons are joined

• tRNA is synthesized

• Amino acids are joined together