IB Bio test on 7 & 8

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

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

• introns

• exons

How does production of nucleosomes, made of DNA and histones, change expression of a gene?

• DNA is tightly bound to nine histone proteins making it less accessible to transcription factors.

• DNA is more loosely bound to nine histone proteins making it more accessible to transcription factors.

• DNA is wrapped around four histone proteins preventing its attachement to transcription factors

State the direction of transcription

• 5' --> 3'

• 3' --> 5'

The products of photosynthesis include

• water and carbon dioxide.

• glucose and oxygen.

• oxygen and carbon dioxide.

• carbon dioxide and glucose.

Light dependent reactions use light energy to produce

• ATP and oxygen.

• carbon dioxide.

• water and oxygen.

• glucose.

Light independent reactions use ATP and H⁺ to fix _______ to make ______.

• oxygen; glucose

• carbon dioxide, glucose

• oxygen; water

• carbon dioxide; water

Light energy splits a water molecule into 4H⁺, 4e^-, and O₂ in a process called

• photolysis.

• hydrolysis.

• oxidation.

• reduction.