Question 1

Match each term with its definition.
-malignant

Accepted Answer

A)  regulatory protein that activates the expression of an operon's genes
B)  interfering RNA molecules originally encoded by nuclear DNA
C)  process of controlling the expression of genes that takes place at the DNA level
D)  regulatory protein that prevents an operon's genes from being expressed
E)  inhibition of transcription via DNA methylationF) interfering RNA molecules associated with some viral life cyclesG) tumour comprising cells that invade and disrupt the surrounding tissuesH) increases expression of an operon's genesI) cluster of prokaryotic genes and their associated DNA regulatory sequencesJ) tumour comprising undifferentiated cells that stay together in a single massK) spread of malignant cells through the blood or lymphatic systemL) removes a nucleosome from DNA to expose a promoter

Question 2

Why can steroid hormones trigger gene expression in a select number of different cells?

Accepted Answer

A)  because only target cells allow the steroid hormone to cross the plasma membrane
B)  because only the target cells have a steroid hormone response element encoded in their DNA
C)  because only the target cells have the correct coactivator
D)  because only the target cells have a nucleus

Question 3

Which of the following genes encode proteins that generally stimulate cell division in normal cells?

Accepted Answer

A)  proto-suppressor genes
B)  proto-oncogenes
C)  oncogenes
D)  tumour suppressor genes

Question 4

Which term refers to a cluster of genes transcribed into a single mRNA unit in the operon model?

Accepted Answer

A)  alpha genes
B)  mRNA cluster
C)  gene group
D)  transcription unit

Question 5

Identify each labelled part on the illustration of the Lac operon.

-lacZ

Accepted Answer

The answer of Identify each labelled part on the illustration...

Question 6

Which of the following are the regulatory proteins that play a role in a positive regulatory system that controls the expression of one or more genes?

Accepted Answer

A)  introns
B)  exons
C)  activators
D)  enhancers

Question 7

Identify each labelled part on the illustration of the Lac operon.

-lacI

Accepted Answer

The answer of Identify each labelled part on the illustration...

Question 8

Suppose that an E. coli has a mutation in its lac operon such that the Lac repressor could NOT bind the operator, even in the absence of lactose. What would be the result in terms of the function of the operon?

Accepted Answer

A)  The lac operon would be transcribed, but at a high level.
B)  The lac operon would be expressed only when lactose was present.
C)  There would be no real impact on lac operon expression.
D)  The lac operon would be transcribed, but at a low level.

Question 9

Identify each labelled part on the illustration of the Lac operon.

-operator

Accepted Answer

The answer of Identify each labelled part on the illustration...

Question 10

Which type of RNA is produced from genes that come from outside the cell?

Accepted Answer

A)  mRNA
B)  miRNA
C)  tRNA
D)  siRNA

Question 11

Where does the first general transcription factor bind to?

Accepted Answer

A)  site where transcription starts
B)  TATA box
C)  activator
D)  enhancer

Question 12

What is the primary distinction between different nucleated cells in a developing zygote?

Accepted Answer

A)  the expression of a gene or group of genes
B)  the genetic code of each cell
C)  the number of chromosomes present in the nucleus
D)  the expression of housekeeping genes

Question 13

Which element(s)  does RNA polymerase II bind to?

Accepted Answer

A)  transcription factors bound to the promoter
B)  free-floating transcription factors
C)  TATA box
D)  promoter sequence

Question 14

What is the role of a tumour suppressor protein in a cell?

Accepted Answer

A)  to promote cell division of abnormal cells
B)  to slow or halt cell division in abnormal cells
C)  to trigger DNA replication in preparation for cell division
D)  to promote cell division of healthy cells

Question 15

In catabolite repression, what is indicated by high levels of cAMP?

Accepted Answer

A)  low lactose
B)  low glucose
C)  high lactose
D)  high glucose

Question 16

Suppose that you are asked to locate some mRNA masking proteins, and are given two rabbits-one male and one female-to use as your cell sources. Also suppose that you decide to do some needle biopsies of one particular tissue, and to extract the masking proteins. Which tissues or organ samples should you collect for analysis?

Accepted Answer

A)  skin cells
B)  testes
C)  liver cells
D)  ovaries

Question 17

Which of the following components of an operon is a molecule of DNA?

Accepted Answer

A)  repressor
B)  lactose
C)  mRNA
D)  operator

Exam 14: Control of Gene Expression

What is the role of a tumour suppressor protein in a cell?

Correct Answer
verified

Identify each labelled part on the illustration of the Lac operon. -lacZ

Correct Answer
verified

Which of the following genes encode proteins that generally stimulate cell division in normal cells?

Correct Answer
verified

Which term refers to a cluster of genes transcribed into a single mRNA unit in the operon model?

Correct Answer
verified

Identify each labelled part on the illustration of the Lac operon. -operator

Correct Answer
verified

Why can steroid hormones trigger gene expression in a select number of different cells?

Correct Answer
verified

In catabolite repression, what is indicated by high levels of cAMP?

Correct Answer
verified

Match each term with its definition. -malignant

Correct Answer
verified

Where does the first general transcription factor bind to?

Correct Answer
verified

Which type of RNA is produced from genes that come from outside the cell?

Correct Answer
verified

Which element(s) does RNA polymerase II bind to?

Correct Answer
verified

What is the primary distinction between different nucleated cells in a developing zygote?

Correct Answer
verified

Identify each labelled part on the illustration of the Lac operon. -lacI

Correct Answer
verified

Which of the following are the regulatory proteins that play a role in a positive regulatory system that controls the expression of one or more genes?

Correct Answer
verified

Correct Answer
verified

Which of the following components of an operon is a molecule of DNA?

Correct Answer
verified

Suppose that an E. coli has a mutation in its lac operon such that the Lac repressor could NOT bind the operator, even in the absence of lactose. What would be the result in terms of the function of the operon?

Correct Answer
verified

Exam 14: Control of Gene Expression

What is the role of a tumour suppressor protein in a cell?

Correct AnswerverifiedShow Answer

Identify each labelled part on the illustration of the Lac operon. -lacZ

Correct AnswerverifiedShow Answer

Which of the following genes encode proteins that generally stimulate cell division in normal cells?

Correct AnswerverifiedShow Answer

Which term refers to a cluster of genes transcribed into a single mRNA unit in the operon model?

Correct AnswerverifiedShow Answer

Identify each labelled part on the illustration of the Lac operon. -operator

Correct AnswerverifiedShow Answer

Why can steroid hormones trigger gene expression in a select number of different cells?

Correct AnswerverifiedShow Answer

In catabolite repression, what is indicated by high levels of cAMP?

Correct AnswerverifiedShow Answer

Match each term with its definition. -malignant

Correct AnswerverifiedShow Answer

Where does the first general transcription factor bind to?

Correct AnswerverifiedShow Answer

Which type of RNA is produced from genes that come from outside the cell?

Correct AnswerverifiedShow Answer

Which element(s) does RNA polymerase II bind to?

Correct AnswerverifiedShow Answer

What is the primary distinction between different nucleated cells in a developing zygote?

Correct AnswerverifiedShow Answer

Identify each labelled part on the illustration of the Lac operon. -lacI

Correct AnswerverifiedShow Answer

Which of the following are the regulatory proteins that play a role in a positive regulatory system that controls the expression of one or more genes?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following components of an operon is a molecule of DNA?

Correct AnswerverifiedShow Answer

Suppose that an E. coli has a mutation in its lac operon such that the Lac repressor could NOT bind the operator, even in the absence of lactose. What would be the result in terms of the function of the operon?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified