biology

DNA is replicated discontinuously along the

• leading strand

• lagging strand

• replication fork

• single-stranded binding proteins

Transcription takes place in the

• ribosome

• nucleus

• endoplasmic reticulum

• cytoplasm

In the first step of transcription

• RNA polymerase adds a primer to the template strand of DNA

• a complementary strand of mRNA is made in the 5' to 3'direction

• the mRNA is released from the ribosome and undergoes editing

• RNA polymerase binds to the promoter region of the template strand & unzips the helix

Translate the following sequence

• Met - Pro - Ser - Ala - Ala - Leu

• Met - His - Ser - Arg - Ala - Leu

• 3' U A C G U A A G A U C C C G A G A U A U U 5'

• 5' U A C G U A A G A U C C C G A G A U A U U 3'

Which of the following lists, in order, the steps of translation?

• replication, transcription, translation

• helicase, primase, polymerase

• initiation, elongation, termination

• promoter, entension, terminator

What marks the beginning of translation?

• the promoter region is recognized

• primase creates a sequence of bases that will serve as the primer

• the AUG triplet codon is read and tRNA carries the first amino acid (Met) to the ribosome

• helicase is used to unzip the helix

Which enzyme is responsible for creating the RNA primer that marks the beginning of replication?

• helicase

• RNA polymerase

• primase

• ligase

In the DNA molecule below, which strand would serve as the leading strand?

• 3' A C G G T A A C G G T T C G C T A 5'

• 5' T G C C A T T G C C A A G C G A T 3'

• neither; RNA must be transcribed before replication can occur

This term is used to describe the different directions that the 2 strands of a DNA double-helix run in

• perpendicular

• anti-parallel

• they do not run in different directions

• semi-conservative

What is the main reason for the directionality of the DNA double-helix?

• this helps DNA to take up less space, so it is better able to be condensed into chromosomes

• this is necessary in order for the complementary bases to come into contact with each other

• this keeps the sugar-phosphate backbone from breaking apart during replication

• this ensures that DNA can be recognized by the nucleus