Topic 7: Molecular Genetics Period 3

Transcription begins at sequences called

• Start Codons
• Promoters
• Origins
• Introns

A distal control region that activators bind to are bent to contact mediator proteins and form the transcription initiation complex

• enhancers
• promoters
• repressors
• transcription factors

During DNA methylation

• mRNA molecules are prohibited from being translated
• a methyl cap is added to the 5' end to prevent DNA degredation
• transcription factor proteins recruit RNA polymerase initiating transcription
• chromatin becomes more tightly packed

_______ is to transcription as ________ is to translation.

• mRNA / Amino Acid Chain
• Amino Acid Chain / mRNA
• Ribosome / Nucleus
• mRNA / tRNA

What does the inducer molecule do in an inducable operon?

• it binds to the repressor protein allowing transcription to occur
• it binds to the promoter allowing transcription to occur
• it binds to the operator and stops transcription
• it binds to the repressor and stops transcription

A chemical modification of DNA that does not affect the nucleotide sequence of a gene but makes that gene less likely to be expressed.

• methylation
• acetylation
• alternative splicing
• snRPs

In eukaryotes, proteins that help the RNA polymerase bind to the promoter for transcription

• transcription factors
• topoisomerase
• regulatory genes
• activators

Translation happens in the

• Nucleus
• Ribosome
• Chloroplast
• Smooth Endoplasmic Reticulum

Which of the following is an example of post-transcriptional control of gene expression?

• the addition of methyl groups to cytosine bases of DNA
• the binding of transcription factors to a promoter
• the removal of introns and splicing together of exons
• gene amplification contributing to cancer

DNA molecule segment is : TTACGCAAG
The mutated DNA segment is TTATCGCAAG. This is an example of ___ mutation.

• Deletion
• Substitution
• Insertion
• Inversion

Tags

NGSS.HS-LS3-2