EXPRESSION OF BIOLOGICAL INFORMATION

The DNA molecule consists of monomers known as

• nucleotide

• nucleoside

• pyrimidine

• purine

A new DNA strand only elongated in the 5’ to 3’ direction because

• DNA polymerase adds nucleotides at the 5’ end

• Replication must progress toward the replication fork

• Okazaki fragments prevent elongation in the 3’ to 5’ direction

• DNA polymerase adds nucleotides only to the free 3’ end

DNA ligase are enzymes that

• Unwind the double helix of DNA during replication

• Link the nucleotides of the new DNA strand along the template of the old strand

• Rejoin the two DNA strands (one new and one old) after replication

• Annealing the Okazaki fragments

Function of primase in the figure as

• Unwinding the DNA double strand to allow DNA polymerase to function

• Forming replication fork

• Making short strands of RNA at the site where replication begins

• Hydrolyzing ATP to facilitate DNA unwinding

Transcription occur in

• Cytoplasm

• Ribosome

• Nucleus

All of the followings are the function of promoter except for

• Act as binding site for RNA polymerase

• Act as stop signal for transcription

• To determine which strand act as template

What is the product of transcription and where does it go after the process?

• rRNA, ribosome

• rRNA, cytoplasm

• mRNA, ribosome

• mRNA, cytoplasm

What is the name of enzyme for amino acid activation?

• aminoacyl tRNA synthase

• aminoacyl tRNA synthetase

• aminoacyl rRNA synthase

• aminoacyl rRNA synthetase

What are the three steps in elongation stage of translation (in sequence order)?

• Codon recognition, translocation, peptide bond formation

• Codon recognition, peptide bond formation, translocation

• Peptide bond formation, translocation, codon recognition

• Peptide bond formation, codon recognition, translocation

What happen when it reach stop codon during termination stage?

• Aminoacyl tRNA bind to A site

• Aminoacyl tRNA bind to P site

• Release factor bind to A site

• Release factor bind to P site