Question 1

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

Question 2

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 3

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 
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 4

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 
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 5

Where does the first general transcription factor bind to?

Accepted Answer

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

Question 6

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 
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 7

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. 
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 8

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

Question 9

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

Question 10

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

Question 11

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 12

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

Accepted Answer

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

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

Question 14

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 15

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

Accepted Answer

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

Question 16

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

Question 17

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 methylation
F)interfering RNA molecules associated with some viral life cycles
G)tumour comprising cells that invade and disrupt the surrounding tissues
H)increases expression of an operon's genes
I)cluster of prokaryotic genes and their associated DNA regulatory sequences
J)tumour comprising undifferentiated cells that stay together in a single mass
K)spread of malignant cells through the blood or lymphatic system
L)removes a nucleosome from DNA to expose a promoter 
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 methylation
F)interfering RNA molecules associated with some viral life cycles
G)tumour comprising cells that invade and disrupt the surrounding tissues
H)increases expression of an operon's genes
I)cluster of prokaryotic genes and their associated DNA regulatory sequences
J)tumour comprising undifferentiated cells that stay together in a single mass
K)spread of malignant cells through the blood or lymphatic system
L)removes a nucleosome from DNA to expose a promoter

Exam 14: Control of Gene Expression

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

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

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

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

Where does the first general transcription factor bind to?

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

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?

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

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?

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

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

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

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

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

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

Match each term with its definition. -malignant

Light and Life

The Cell: an Overview

Defining Life and Its Origins

Energy and Enzymes

Cell Membranes and Signalling

Cellular Respiration

Photosynthesis

Cell Cycles

Genetic Recombination

Mendel, Genes, and Inheritance

Genes, Chromosomes, and Human Genetics

Dna Structure, Replication, and Organization

Gene Structure and Expression

Dna Technologies

Genomes and Proteomes

Evolution: the Development of the Theory

Microevolution: Changes Within Populations

Species and Macroevolution

Understanding the History of Life on Earth

Humans and Evolution

Bacteria and Archaea

Viruses, Viroids, and Prions: Infectious Biological Particles

Protists

Fungi

Plants

Diversity of Animals 1: Sponges, Radiata, Platyhelminthes, and Protostomes

Diversity of Animals 2: Deuterostomes: Vertebrates and Their Closest Relatives

Population Ecology

Population Interactions and Community Ecology

Ecosystems

Conservation of Biodiversity

Putting Selection to Work

Organization of the Plant Body

Transport in Plants

Reproduction and Development in Flowering Plants

Plant Nutrition

Plant Signals and Responses to the Environment

Introduction to Animal Organization and Physiology

Transport in Animals: the Circulatory System

Reproduction in Animals

Animal Development

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Integration

Muscles, Skeletons, and Body Movements

Animal Behaviour

Animal Nutrition

Gas Exchange: the Respiratory System

Regulating the Internal Environment

Defences Against Disease

Conservation and Evolutionary Physiology

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