What is the role of operons in prokaryote gene expression?

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

It makes the genes prokaryotes be turned on

To make the gene turn of and off

The lac operon genes only become expressed if:

the repressor binds to the operator

How can a person's muscle cells have the same exact DNA sequences as their nerve cells even though the look and perform completely different?

The proteins expressed in each cell are different

The two different cells become mutated

They actually have different DNA in the two types of cells.

The genome of the different cells changes

In eukaryotic cells, transcription cannot begin until

several transcription factors have bound to the promoter.

the two DNA strands have completely separated and exposed the promoter.

the 5' caps are removed from the mRNA.

the DNA introns are removed from the template.

Which of the follwoing best describes the significance of the TATA box in eukaryotic promoters?

it is the recognition site for a specific transcription factor

it sets the reading frame of the mRNA

it is the recognition site for ribosomal binding

it signals the end of the nucleotide sequence of the gene

RNA polymerase moves in which direction along the DNA?

3' to 5' along the template strand

3' to 5' along nontemplate(coding) strand

5' to 3' along the template strand

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

the removal of introns and splicing together of exons

the addition of methyl groups to cytosine bases of DNA

the binding of transcription factors to a promoter

gene amplification contributing to cancer

The production of mature mRNA in eukaryotes involves

cutting introns out and spicing exons together

What is the function of the poly-A tail in mRNA?

to help protect the mRNA from degradation by hydrolytic enzymes

to add modified guanin to the 3' end of the mRNA

to indicate the site of translational termination

to code for the binding of RNA polymerase to the DNA

Which of the following events in translation is the first to occur in eukaryotes?

the small subunit of the ribosome recognizing and attaching to the 5'cap

base pairing of activated methionine-tRNA to AUG of the messenger RNA

binding of the larger ribosomal subunit to smaller ribosomal subunits

What must happen to a newly made polypeptide before it can be secreted from a cell?

its signal sequence must target it to the ER, after which it goes to the Golgi

it must be translated by a ribosome that remains free of attachment to the ER

Its signal sequence must be cleaved off

Its signal sequence must target it to the plasma membrane

What does the lactose do to the Operon?

Allows the repressor to unbind from the Operator.

Blocks transcription because of the energy it provides

The lactose binds the lactose and stops transcription

Allows for the transcription to speed

For a repressible operon to be transcribed, which of the following must be true?

RNA polymerase must bind to the promoter, and the repressor must be inactive.

RNA polymerase and the active repressor must be present.

RNA polymerase cannot be present, and the repressor must be inactive.

In a point mutation, this would have the worst effect on the function of the protein

an insertion or deletion at the beginning of the gene

an insertion or deletion near the end of a gene

an insertion at the middle of the gene

section of mRNA that codes for protein

section of mRNA that does not code for protein

section of tRNA that codes for protein

section of rRNA that codes for protein

Alternative RNA splicing ____.

can allow the production of proteins of different sizes and functions from a single mRNA

is a mechanism for increasing the rate of translation

can allow the production of similar proteins from different RNAs

increases the rate of transcription

How can a person's muscle cells have the same exact DNA sequences as their nerve cells even though the look and perform completely different?

The proteins expressed in each cell are different

The two different cells become mutated

They actually have different DNA in the two types of cells.

The genome of the different cells changes

What happens in RNA processing and where does it occur?

5' cap and 3' poly A tail added, in nucleus

3' cap and 5' poly A tail added, in cytoplasm

introns cut out and exons reattached, nucleus

introns cut out and exons reattached, cytoplasm

Gene Expression in Eukaryotes

Authored by Lucas Fatsy

Biology

11th Grade - University

NGSS covered

Used 75+ times

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MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which of the following best explains the term gene expression?

the production of proteins based on the genetic information in DNA

the suppression of RNA polymerase

the suppression of protein production

the production of lipids based on the genetic information in DNA

How is the information in a DNA molecule expressed in an organism?

through plasmids

through RNA polymerase

through recombinant DNA

through proteins

What would happen if a chemical interfered with the ability of RNA polymerase to bind to a DNA molecule?

Transcription would proceed, and a protein would be produced.

The DNA molecule would replicate itself.

The RNA polymerase would cut the DNA molecule in half.

Transcription would not take place, and the protein would not be produced.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

_ is to transcription as __ is to translation.

mRNA / Amino Acid Chain

Amino Acid Chain / mRNA

Ribosome / Nucleus

mRNA / tRNA

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Translation is performed by:

Ribosomes

Mitochondria

Golgi Bodies

Endoplasmic Reticulum

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Translation in eukaryotes occurs:

Outside of the Nucleus

Inside of the Nucleus

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

what is an operon?

a part of a ribsome

a part of a Rna

a unit made up of linked genes that code for proteins needed to do a specific task

needed for dna replication

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Gene Expression in Eukaryotes

Which of the following best explains the term gene expression?

How is the information in a DNA molecule expressed in an organism?

What would happen if a chemical interfered with the ability of RNA polymerase to bind to a DNA molecule?