Gene Expression

The protein that performs RNA splicing by removing introns and connecting exons is called a(n) ________.

Which of the following is characteristic of the product of the p53 gene?

• It is an activator for other genes.

• It speeds up the cell cycle.

• It causes cell death via apoptosis.

• It allows cells to pass on mutations due to DNA damage.

• It slows down the rate of DNA replication by interfering with the binding of DNA polymerase.

Attachment of ______ groups to ______ will cause promotion of gene expression due to looser DNA.

• acetyl, DNA

• methyl, DNA

• acetyl, histones

• methyl, histones

The noncoding sequence of DNA located within the promoter where RNA polymerase will bind is called the ________.

All of the following occur before mature RNA is formed except:

• Addition of a poly-A tail

• Addition of a 3' cap

• Addition of a release factor

• Removal of introns

• Alternative splicing

The sequence of nucleotides complementary to one located on mRNA that is carried by tRNA towards the translation site is called a(n):

The function of siRNAs is to:

• play a role in RNAi

• contribute to euchromatin formation

• degrade mature RNA

• contribute to forming mutations in the promoter sequence

What is the role of operons in prokaryote gene expression?

• It makes the genes prokaryotes be turned on

• It accounts for the regulation of gene activity in response to the needs of the cells

• To make DNA for the gene

• To make the gene turn of and off

Regulatory proteins (transcription factors) may

• encourage transcription

• prevent transcription

• stop transcription once its started

• either encourage or prevent transcription

What is 1 in the diagram?

• RNA polymerase

• Inducer

• Repressor

• Operator