IB Biology

Which type of RNA is a copy of a gene used to encode a polypeptide?

• mRNA

• tRNA

• rRNA

The synthesis of mRNA copied from the DNA base sequence is known as

• transcription

• translation

• replication

The enzyme that binds to a site on the DNA, separates the strands, and covalently bonds ribonucleside triphosphates opposite their complementary partner is

• RNA Polymerase

• DNA Polymerase

• DNA Helicase

• RNA Primase

The nucleotides are aligned with their complementary partners on which strand of DNA?

• DNA antisense strand

• DNA sense strand

The ribonucleoside triphosphates use energy from the breaking of the bonds of two of the phosphate groups to gain energy to form the phosphodiester bond, a process known as

• hydrolysis

• condensation

Which region of DNA is edited out of mRNA and recycled into nucleotides?

• introns

• exons

The sequence of DNA that serves as the attachment point for RNA polymerase is called what?

• promoter

• enhancer

• silencer

Telomeres are the ends of chromosomes that contains highly repetitive DNA sequences. The purpose of these regions are

• to protect the DNA molecule from degradation during replication.

• to increase the rate of transcription.

• to edit out non-coding regions of DNA.

In regulation of gene expression of lactose, when lactose is not present in the system, ___________ binds to the operator.

• the repressor

• RNA polymerase

• the promoter

• DNA polymerase

An example of something impacted by environment is

• Human skin color

• Human hair color

• Pigment in the fur of Himalayan rabbits

• All of the above

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NGSS.HS-LS3-2