Question 1

Dioxins

Accepted Answer

A) do not cause chloracne, a disfiguring skin disease 
B) were produced as a by-product of Agent Orange, the herbicide used in the Vietnam War 
C) are well understood as to their effects on humans 
D) none of these 
A) do not cause chloracne, a disfiguring skin disease 
B) were produced as a by-product of Agent Orange, the herbicide used in the Vietnam War 
C) are well understood as to their effects on humans 
D) none of these B

Question 2

Heavy metals such as mercury, thallium, and lead react with and interfere with the action of

Accepted Answer

A) carbohydrates 
B) enzymes 
C) lipids (oily substances) 
D) none of these 
A) carbohydrates 
B) enzymes 
C) lipids (oily substances) 
D) none of these B

Question 3

The amount of a substance which is lethal to 50% of the test population is called lthe

Accepted Answer

A) LT-50 
B) ET-50% 
C) LD50 
D) statistical average value 
A) LT-50 
B) ET-50% 
C) LD50 
D) statistical average value C

Question 4

Carcinogens are chemicals that can cause

Accepted Answer

A) birth defects 
B) mutations 
C) cancer 
D) hair loss 
A) birth defects 
B) mutations 
C) cancer 
D) hair loss

Question 5

Medications and toxins alike can enter the body through the skin.

Accepted Answer

A) True 
 B)False

Question 6

The toxin arsenic occurs naturally in the water supplies in some locations.

Accepted Answer

A) True 
 B)False

Question 7

PCBs, or polychlorinated biphenyls,

Accepted Answer

A) are used today extensively for various purposes in industry 
B) are safe for aquatic organisms 
C) can cause chloracne in humans and their manufacture in the US has been discontinued 
D) none of these 
A) are used today extensively for various purposes in industry 
B) are safe for aquatic organisms 
C) can cause chloracne in humans and their manufacture in the US has been discontinued 
D) none of these

Question 8

Nerve cells (neurons) are connected by

Accepted Answer

A) cilia 
B) ligaments 
C) gaps or synapses across which chemicals called neurotransmitters flow 
D) none of these 
A) cilia 
B) ligaments 
C) gaps or synapses across which chemicals called neurotransmitters flow 
D) none of these

Question 9

The insecticides parathion and malathion interfere with the

Accepted Answer

A) Citric Acid Cycle 
B) Krebs Cycle 
C) Acetylcholine Cycle 
D) none of these 
A) Citric Acid Cycle 
B) Krebs Cycle 
C) Acetylcholine Cycle 
D) none of these

Question 10

Neurotoxins interfere with the

Accepted Answer

A) Citric Acid cycle 
B) Krebs cycle 
C) Acetylcholine Cycle 
D) none of these 
A) Citric Acid cycle 
B) Krebs cycle 
C) Acetylcholine Cycle 
D) none of these

Question 11

The insecticide DDT (p-dichlorodiphenyltrichloroethane) is

Accepted Answer

A) highly toxic to humans 
B) toxic to some aquatic life 
C) toxic to some aquatic life, and able to interfere with the strength of eggshells, causing a decline I bird population 
D) very expensive 
A) highly toxic to humans 
B) toxic to some aquatic life 
C) toxic to some aquatic life, and able to interfere with the strength of eggshells, causing a decline I bird population 
D) very expensive

Question 12

Nitrogen dioxide (NO2) is

Accepted Answer

A) very dangerous to humans, even at low concentrations 
B) dangerous to humans at high concentrations 
C) more toxic to plants than sulfur dioxide (SO2) 
D) useful to silo fillers as a breathing aid 
A) very dangerous to humans, even at low concentrations 
B) dangerous to humans at high concentrations 
C) more toxic to plants than sulfur dioxide (SO2) 
D) useful to silo fillers as a breathing aid

Question 13

British Anti-Lewisite (BAL) is able to react with and remove the following toxin(s) from the body.

Accepted Answer

A) Sulfur dioxide (SO2) 
B) Nitrogen dioxide (NO2) 
C) Carbon monoxide (CO) 
D) Mercury (Hg) and lead (Pb) 
A) Sulfur dioxide (SO2) 
B) Nitrogen dioxide (NO2) 
C) Carbon monoxide (CO) 
D) Mercury (Hg) and lead (Pb)

Question 14

Catalysts are substances which

Accepted Answer

A) slow down an undesired reaction 
B) speed up a reaction while being used up in the reaction 
C) speed up a reaction without being used up in the reaction 
D) none of these 
A) slow down an undesired reaction 
B) speed up a reaction while being used up in the reaction 
C) speed up a reaction without being used up in the reaction 
D) none of these

Question 15

Teratogens such as thalidomide can cause

Accepted Answer

A) birth defects 
B) anemia 
C) hepatitis 
D) none of these 
A) birth defects 
B) anemia 
C) hepatitis 
D) none of these

Question 16

The lungs are protected from inhalation of large (but not small) particles by the

Accepted Answer

A) cilia 
B) the body's largest organ which is the skin 
C) the pulmonary system 
D) none of these 
A) cilia 
B) the body's largest organ which is the skin 
C) the pulmonary system 
D) none of these

Question 17

Catalysts in living organisms are called

Accepted Answer

A) placebos 
B) positrons 
C) enzymes 
D) inhibitors 
A) placebos 
B) positrons 
C) enzymes 
D) inhibitors

Question 18

The major route for the absorption of nutrients and water into the body is

Accepted Answer

A) the gastro-intestinal tract 
B) the body's largest organ which is the skin 
C) the pulmonary system 
D) the circulatory system 
A) the gastro-intestinal tract 
B) the body's largest organ which is the skin 
C) the pulmonary system 
D) the circulatory system

Question 19

Lead poisoning can cause

Accepted Answer

A) mental retardation and hyperactivity in developing young people 
B) nerve damage such as irrational behavior in adults 
C) anemia (lowered hemoglobin levels in the blood) 
D) all of these 
A) mental retardation and hyperactivity in developing young people 
B) nerve damage such as irrational behavior in adults 
C) anemia (lowered hemoglobin levels in the blood) 
D) all of these

Question 20

The toxin carbon monoxide (CO) acts by reacting with and tying up

Accepted Answer

A) adenosine triphosphate (ATP) 
B) thyroxin 
C) thiamine 
D) hemoglobin 
A) adenosine triphosphate (ATP) 
B) thyroxin 
C) thiamine 
D) hemoglobin

Dioxins

Heavy metals such as mercury, thallium, and lead react with and interfere with the action of

The amount of a substance which is lethal to 50% of the test population is called lthe

Carcinogens are chemicals that can cause

Medications and toxins alike can enter the body through the skin.

The toxin arsenic occurs naturally in the water supplies in some locations.

PCBs, or polychlorinated biphenyls,

Nerve cells (neurons) are connected by

The insecticides parathion and malathion interfere with the

Neurotoxins interfere with the

The insecticide DDT (p-dichlorodiphenyltrichloroethane) is

Nitrogen dioxide (NO₂) is

British Anti-Lewisite (BAL) is able to react with and remove the following toxin(s) from the body.

Catalysts are substances which

Teratogens such as thalidomide can cause

The lungs are protected from inhalation of large (but not small) particles by the

Catalysts in living organisms are called

The major route for the absorption of nutrients and water into the body is

Lead poisoning can cause

The toxin carbon monoxide (CO) acts by reacting with and tying up

Background to the Environmental Problem

The Natural Laws

Underlying Principles of Chemistry

Types of Chemical Compounds and Their Reactions

Element Cycles

Energy and Modern Society

Emerging Energy Sources

Weather and Climate

Air Quality

Air Inside

Global Atmospheric Change

Water

Water Quality

Solid Wastes

Hazardous Wastes

Filters

Exam 6: Toxicology

Dioxins

Heavy metals such as mercury, thallium, and lead react with and interfere with the action of

The amount of a substance which is lethal to 50% of the test population is called lthe

Carcinogens are chemicals that can cause

Medications and toxins alike can enter the body through the skin.

The toxin arsenic occurs naturally in the water supplies in some locations.

PCBs, or polychlorinated biphenyls,

Nerve cells (neurons) are connected by

The insecticides parathion and malathion interfere with the

Neurotoxins interfere with the

The insecticide DDT (p-dichlorodiphenyltrichloroethane) is

Nitrogen dioxide (NO2) is

British Anti-Lewisite (BAL) is able to react with and remove the following toxin(s) from the body.

Catalysts are substances which

Teratogens such as thalidomide can cause

The lungs are protected from inhalation of large (but not small) particles by the

Catalysts in living organisms are called

The major route for the absorption of nutrients and water into the body is

Lead poisoning can cause

The toxin carbon monoxide (CO) acts by reacting with and tying up

Background to the Environmental Problem

The Natural Laws

Underlying Principles of Chemistry

Types of Chemical Compounds and Their Reactions

Element Cycles

Energy and Modern Society

Emerging Energy Sources

Weather and Climate

Air Quality

Air Inside

Global Atmospheric Change

Water

Water Quality

Solid Wastes

Hazardous Wastes

Filters

Nitrogen dioxide (NO₂) is