Question 1

Rous demonstrated that something smaller than a bacterium could cause cancer by

Accepted Answer

A)  putting a chicken with cancer in the same cage as a healthy chicken. 
B)  injecting healthy chickens with a mixture of bacteria and tumor cells. 
C)  injecting healthy chickens with carefully filtered extracts from tumor cells. 
D)  exposing healthy chickens to tumor cells from humans. 
A)  putting a chicken with cancer in the same cage as a healthy chicken. 
B)  injecting healthy chickens with a mixture of bacteria and tumor cells. 
C)  injecting healthy chickens with carefully filtered extracts from tumor cells. 
D)  exposing healthy chickens to tumor cells from humans.

Question 2

Cancer cells cause tumors in other parts of the body by traveling through the _______.

Accepted Answer

The answer of Cancer cells cause tumors in other parts...

Question 3

Which of the following statements about retinoblastoma is false?

Accepted Answer

A)  Retinoblastoma is caused by a mutation in chromosome 13. 
B)  Retinoblastoma results from a lack of cell division. 
C)  Retinoblastoma is characterized by the presence of a tumor in a child's retina. 
D)  The cause of retinoblastoma was determined by examining karyotypes. 
A)  Retinoblastoma is caused by a mutation in chromosome 13. 
B)  Retinoblastoma results from a lack of cell division. 
C)  Retinoblastoma is characterized by the presence of a tumor in a child's retina. 
D)  The cause of retinoblastoma was determined by examining karyotypes.

Question 4

Positive growth regulators increase the rate of _____________.

Accepted Answer

The answer of Positive growth regulators increase the rate of...

Question 5

Why is cancer more common in older people?

Accepted Answer

Mutations accumulate throughout a person

Question 6

Cancer in humans is caused

Accepted Answer

A)  only by environmental factors. 
B)  only by genetic factors. 
C)  by neither environmental nor genetic factors. 
D)  by both environmental and genetic factors. 
A)  only by environmental factors. 
B)  only by genetic factors. 
C)  by neither environmental nor genetic factors. 
D)  by both environmental and genetic factors.

Question 7

A cure for cancer would stop all cell division in an organism.

Accepted Answer

A) True 
 B)False

Question 8

The cells in many large polyps in the human colon usually contain

Accepted Answer

A)  normal tumor suppressor genes and at least one oncogene. 
B)  one inactive and one active copy of a tumor suppressor gene and normal proto-oncogenes. 
C)  two inactive copies of a tumor suppressor gene and two proto-oncogenes. 
D)  two inactive copies of a tumor suppressor gene and one oncogene. 
A)  normal tumor suppressor genes and at least one oncogene. 
B)  one inactive and one active copy of a tumor suppressor gene and normal proto-oncogenes. 
C)  two inactive copies of a tumor suppressor gene and two proto-oncogenes. 
D)  two inactive copies of a tumor suppressor gene and one oncogene.

Question 9

Even though all people are exposed to potential carcinogens on a daily basis, we do not all develop cancer. Why?

Accepted Answer

A)  The carcinogens are too weak to cause mutations in our DNA. 
B)  Human cells are resistant to carcinogens until we are approximately 50 years old. 
C)  DNA repair mechanisms are able to correct some of the mutations that occur. 
D)  Humans' oncogenes protect us from most of the carcinogens we are exposed to. 
A)  The carcinogens are too weak to cause mutations in our DNA. 
B)  Human cells are resistant to carcinogens until we are approximately 50 years old. 
C)  DNA repair mechanisms are able to correct some of the mutations that occur. 
D)  Humans' oncogenes protect us from most of the carcinogens we are exposed to.

Question 10

A physical, chemical, or biological agent that causes cancer is called

Accepted Answer

A)  a virus. 
B)  a carcinogen. 
C)  an oncogene. 
D)  a regulatory protein. 
A)  a virus. 
B)  a carcinogen. 
C)  an oncogene. 
D)  a regulatory protein.

Question 11

Rous's work on sarcomas in chickens led to the discovery of the first animal tumor-causing _________.

Accepted Answer

The answer of Rous's work on sarcomas in chickens led...

Question 12

A physical, chemical, or biological agent that causes cancer is a ___________.

Accepted Answer

The answer of A physical, chemical, or biological agent that...

Question 13

A tumor suppressor is a(n)

Accepted Answer

A)  negative growth regulator. 
B)  positive growth regulator. 
C)  oncogene. 
D)  sarcoma virus. 
A)  negative growth regulator. 
B)  positive growth regulator. 
C)  oncogene. 
D)  sarcoma virus.

Question 14

Which of the following kinds of molecules are the least likely to be produced by a proto-oncogene?

Accepted Answer

A)  receptor proteins 
B)  protein kinases 
C)  growth factors 
D)  ribosomal proteins 
A)  receptor proteins 
B)  protein kinases 
C)  growth factors 
D)  ribosomal proteins

Question 15

Most cancers are caused by a combination of environmental factors.

Accepted Answer

A) True 
 B)False

Question 16

Some carcinogens can bind with DNA and form a(n) _______ that causes mistakes in DNA synthesis.

Accepted Answer

The answer of Some carcinogens can bind with DNA and...

Question 17

A protein is identified that starts a signal cascade leading to the activation of a gene that promotes cell division. This protein is coded for by a

Accepted Answer

A)  tumor supressor gene. 
B)  oncogene. 
C)  proto-oncogene. 
D)  carcinogen. 
A)  tumor supressor gene. 
B)  oncogene. 
C)  proto-oncogene. 
D)  carcinogen.

Question 18

Which of the following is not true of cell division?

Accepted Answer

A)  A cell has no control over how often it divides. 
B)  Negative growth regulators are used to halt cell division. 
C)  Numerous cellular proteins are affected by cell division signals. 
D)  Uncontrolled cell division can cause cancer. 
A)  A cell has no control over how often it divides. 
B)  Negative growth regulators are used to halt cell division. 
C)  Numerous cellular proteins are affected by cell division signals. 
D)  Uncontrolled cell division can cause cancer.

Question 19

Examine the figure below.  
In this example, excessive cell division is the result of a mutation that results in

Accepted Answer

A)  excessive activity of a proto-oncogene. 
B)  excessive activity of a tumor suppressor protein. 
C)  changes in a cell's cytoskeleton. 
D)  inactivity of two tumor suppressor proteins. 
A)  excessive activity of a proto-oncogene. 
B)  excessive activity of a tumor suppressor protein. 
C)  changes in a cell's cytoskeleton. 
D)  inactivity of two tumor suppressor proteins.

Question 20

When cells are stimulated to divide,

Accepted Answer

A)  proto-oncogenes are inactivated. 
B)  tumor suppressors are activated. 
C)  tumor suppressors are inactivated. 
D)  oncogenes become proto-oncogenes. 
A)  proto-oncogenes are inactivated. 
B)  tumor suppressors are activated. 
C)  tumor suppressors are inactivated. 
D)  oncogenes become proto-oncogenes.

Exam 40: Cancer: Cell Division Out of Control

Rous demonstrated that something smaller than a bacterium could cause cancer by

Cancer cells cause tumors in other parts of the body by traveling through the _______.

Which of the following statements about retinoblastoma is false?

Positive growth regulators increase the rate of _____________.

Why is cancer more common in older people?

Cancer in humans is caused

A cure for cancer would stop all cell division in an organism.

The cells in many large polyps in the human colon usually contain

Even though all people are exposed to potential carcinogens on a daily basis, we do not all develop cancer. Why?

A physical, chemical, or biological agent that causes cancer is called

Rous's work on sarcomas in chickens led to the discovery of the first animal tumor-causing _________.

A physical, chemical, or biological agent that causes cancer is a ___________.

A tumor suppressor is a(n)

Which of the following kinds of molecules are the least likely to be produced by a proto-oncogene?

Most cancers are caused by a combination of environmental factors.

Some carcinogens can bind with DNA and form a(n) _______ that causes mistakes in DNA synthesis.

A protein is identified that starts a signal cascade leading to the activation of a gene that promotes cell division. This protein is coded for by a

Which of the following is not true of cell division?

Examine the figure below. In this example, excessive cell division is the result of a mutation that results in

When cells are stimulated to divide,

The Nature of Science and the Characteristics of Life

Organizing the Diversity of Life

Major Groups of Living Organisms

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Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy and Enzymes

Photosynthesis and Cellular Respiration

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Patterns of Inheritance

Chromosomes and Human Genetics

DNA

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Control of Gene Expression

DNA Technology

How Evolution Works

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The Biosphere

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Harnessing the Human Genome

Humans and Evolution

Smoking--Beyond Lung Cancer

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