IB Bio: 1st Semester Final

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'

What is a three-base of mRNA called? (2.7.U7)

• anticodon

• polymerase

• Codon

• Helix

What mutation has occurred here?

T-G-A-C-C-A

T-G-A-G-C-A

• point mutation

• frameshift mutation

• monosomy

• trisomy

Tags

NGSS.HS-LS3-2

DNA molecule segment is : TTACGCAAG

The mutated DNA segment is TTCGCAAG. This is an example of ___ mutation.

• point mutation

• frameshift mutation

• monosomy

• trisomy

Tags

NGSS.HS-LS3-2

The "central dogma of genetics" states that genetic information flows from

• Protein-->mRNA-->DNA

• Protein-->DNA-->mRNA

• mRNA-->DNA-->Protein

• DNA-->mRNA-->Protein

Tags

NGSS.HS-LS1-1

NGSS.HS-LS1-6

The amino acid sequence of a polypeptide chain creates the _________ structure of the protein.

• Primary
• Secondary
• Tertiary
• Quaternary

Answer explanation

The primary sequence is the order of amino acids.

Tags

NGSS.HS-LS1-1

Transcription is a process that in eukaryotic cells takes place in the.......

• Nucleus
• Cytoplasm
• Golgi Apparatus
• Rough E.R.

Answer explanation

Transcription happens in the nucleus as it is the DNA that is being transcribed and DNA is only found in the nucleus.

Tags

NGSS.HS-LS1-1

What amino acid is represented by the codon CAG?

• Aspartic Acid
• Histidine
• Glutamine
• Methionine

Answer explanation

Start in the center and move outwards.

Tags

NGSS.HS-LS1-1

A protein that binds to the operator and blocks the RNA polymerase

• regulator
• repressor
• activator
• corepressor