Question 1

All of the representations in the following figure EXCEPT one clearly show double bonds.Choose the exception.

Accepted Answer

A)  electron configuration 
B)  structural formula 
C)  space-filling model 
D)  ball-and-stick model 
A)  electron configuration 
B)  structural formula 
C)  space-filling model 
D)  ball-and-stick model

Question 2

________ is an example of an element.

Accepted Answer

A)  Water 
B)  Carbon 
C)  Glucose 
D)  Salt 
A)  Water 
B)  Carbon 
C)  Glucose 
D)  Salt

Question 3

How can radiation be controlled and safely used in medicine?

Accepted Answer

A)  Apply radiation throughout the body at uncontrolled doses. 
B)  Apply radiation throughout the body at controlled doses. 
C)  Apply radiation to specific parts of the body at uncontrolled doses. 
D)  Apply radiation to specific parts of the body at controlled doses. 
A)  Apply radiation throughout the body at uncontrolled doses. 
B)  Apply radiation throughout the body at controlled doses. 
C)  Apply radiation to specific parts of the body at uncontrolled doses. 
D)  Apply radiation to specific parts of the body at controlled doses.

Question 4

A fossil was found and determined by radiometric dating to be 11,400 years old.What is the ratio of carbon-14 to carbon-12 in this fossil compared to its environment?

Accepted Answer

A)  12.5% 
B)  25% 
C)  37.5% 
D)  50% 
A)  12.5% 
B)  25% 
C)  37.5% 
D)  50%

Question 5

How many oxygen atoms are in the products of the following reaction? C₆H₁₂O₆ + 6 H₂O + 6 O₂ → 6 CO₂ + 12 H₂O

Accepted Answer

A)  18 
B)  6 
C)  12 
D)  24 
A)  18 
B)  6 
C)  12 
D)  24

Question 6

What name is given to substances that resist changes in pH?

Accepted Answer

A)  buffers 
B)  solutions 
C)  acids 
D)  bases 
A)  buffers 
B)  solutions 
C)  acids 
D)  bases

Question 7

Sweating cools your body by ________.

Accepted Answer

A)  cohesion 
B)  radiation 
C)  evaporative cooling 
D)  hydrogen bonding 
A)  cohesion 
B)  radiation 
C)  evaporative cooling 
D)  hydrogen bonding

Question 8

Adjacent water molecules are joined by ________ bonds.

Accepted Answer

A)  covalent only 
B)  ionic 
C)  polar and covalent 
D)  hydrogen 
A)  covalent only 
B)  ionic 
C)  polar and covalent 
D)  hydrogen

Question 9

Why is water considered a polar molecule?

Accepted Answer

A)  The oxygen atom is found between the two hydrogen atoms. 
B)  The oxygen atom attracts the hydrogen atoms. 
C)  The oxygen end of the molecule has a slight negative charge, and the hydrogen end has a slight positive charge. 
D)  Both hydrogen atoms are at one end of the molecule, and the oxygen atom is at the other end. 
A)  The oxygen atom is found between the two hydrogen atoms. 
B)  The oxygen atom attracts the hydrogen atoms. 
C)  The oxygen end of the molecule has a slight negative charge, and the hydrogen end has a slight positive charge. 
D)  Both hydrogen atoms are at one end of the molecule, and the oxygen atom is at the other end.

Question 10

The graph below shows data regarding radioactive decay of carbon-14.If decay continues to occur normally,how much C-14 will remain after 22,800 years?

Accepted Answer

A)  25% 
B)  12.5% 
C)  6.25% 
D)  3.125% 
A)  25% 
B)  12.5% 
C)  6.25% 
D)  3.125%

Question 11

Which of the following is NOT a potential impact of ocean acidification?

Accepted Answer

A)  Decreasing H⁺ concentrations 
B)  Coral bleaching 
C)  Changes in metabolism of marine animals 
D)  Increasing carbonic acid concentrations 
A)  Decreasing H⁺ concentrations 
B)  Coral bleaching 
C)  Changes in metabolism of marine animals 
D)  Increasing carbonic acid concentrations

Question 12

Which of the following is an acid?

Accepted Answer

A)  NaOH 
B)  NaCl 
C)  HCl 
D)  CH₄ 
A)  NaOH 
B)  NaCl 
C)  HCl 
D)  CH₄

Question 13

Which of the following elements,essential to life,is a trace element?

Accepted Answer

A)  phosphorus 
B)  carbon 
C)  iodine 
D)  calcium 
A)  phosphorus 
B)  carbon 
C)  iodine 
D)  calcium

Question 14

Please read the following scenario to answer the following questions.
While radioactive isotopes are used in medicine to identify tumors and other diseases, they can also be used to treat diseases such as cancer. One method to treat cancerous tumors is to expose them to radiation, which can kill the cancerous cells and the tumor. In 2013, the U.S. Food and Drug Administration approved a new cancer treatment based on the radioactive isotope radium-223; this isotope has a half-life of 11.4 days. The radioactive drug, known as Xofigo, is injected into the patient's bloodstream and travels to certain regions of the body. Because it emits high-energy radiation over short distances, it can kill cancerous cells in the sites where it localizes.
After the drug was injected into a person, the following data were collected regarding the amount of radiation measured in different organs in the person's body.
  
-A cancer patient receives an injection of the drug on March 1.Suppose that the patient must receive a second injection once the amount of the drug decreases to less than 6% in his or her body.On approximately what day should the cancer patient schedule an appointment to receive another injection?

Accepted Answer

A)  March 13 
B)  March 23 
C)  April 3 
D)  April 25 
A)  March 13 
B)  March 23 
C)  April 3 
D)  April 25

Question 15

Why (if you are careful)are you able to float a needle on the surface of water?

Accepted Answer

A)  Water has adhesive properties. 
B)  The surface tension that is a result of water's cohesive properties makes this possible. 
C)  The covalent bonds that hold a water molecule together make this possible. 
D)  A single needle is less dense than water. 
A)  Water has adhesive properties. 
B)  The surface tension that is a result of water's cohesive properties makes this possible. 
C)  The covalent bonds that hold a water molecule together make this possible. 
D)  A single needle is less dense than water.

Question 16

Please read the following scenario to answer the following questions.
While radioactive isotopes are used in medicine to identify tumors and other diseases, they can also be used to treat diseases such as cancer. One method to treat cancerous tumors is to expose them to radiation, which can kill the cancerous cells and the tumor. In 2013, the U.S. Food and Drug Administration approved a new cancer treatment based on the radioactive isotope radium-223; this isotope has a half-life of 11.4 days. The radioactive drug, known as Xofigo, is injected into the patient's bloodstream and travels to certain regions of the body. Because it emits high-energy radiation over short distances, it can kill cancerous cells in the sites where it localizes.
After the drug was injected into a person, the following data were collected regarding the amount of radiation measured in different organs in the person's body.
  
-Which of the following would be the best experiment to determine whether this drug is an effective treatment option for cancer patients?

Accepted Answer

A)  Give the drug to a single cancer patient and ask him how he feels several months later. 
B)  Give the drug to a group of mice that have artificially induced tumors and measure whether their tumors are destroyed. 
C)  Give the drug to a group of cancer patients and measure whether their tumors are destroyed. 
D)  Give the drug to a single cancer patient and measure whether her tumor is destroyed. 
A)  Give the drug to a single cancer patient and ask him how he feels several months later. 
B)  Give the drug to a group of mice that have artificially induced tumors and measure whether their tumors are destroyed. 
C)  Give the drug to a group of cancer patients and measure whether their tumors are destroyed. 
D)  Give the drug to a single cancer patient and measure whether her tumor is destroyed.

Question 17

The tendency of molecules of the same kind to stick together is called ________.

Accepted Answer

A)  bonding 
B)  cohesion 
C)  polarity 
D)  adhesion 
A)  bonding 
B)  cohesion 
C)  polarity 
D)  adhesion

Question 18

Examine the drawing of an atom below.The art is technically INCORRECT in that ________.

Accepted Answer

A)  neutrons are not located in the nucleus 
B)  the electrons should be much farther away from the nucleus 
C)  electrons do not orbit the nucleus 
D)  electrons do not have a negative charge 
A)  neutrons are not located in the nucleus 
B)  the electrons should be much farther away from the nucleus 
C)  electrons do not orbit the nucleus 
D)  electrons do not have a negative charge

Question 19

When a base is added to a buffered solution,the buffer will ________.

Accepted Answer

A)  donate OH− ions 
B)  accept water molecules 
C)  donate H⁺ ions 
D)  form covalent bonds with the base 
A)  donate OH− ions 
B)  accept water molecules 
C)  donate H⁺ ions 
D)  form covalent bonds with the base

Question 20

An atom with an electrical charge is a(n)________.

Accepted Answer

A)  isotope 
B)  molecule 
C)  ion 
D)  compound 
A)  isotope 
B)  molecule 
C)  ion 
D)  compound

Exam 2: Essential Chemistry for Biology

All of the representations in the following figure EXCEPT one clearly show double bonds.Choose the exception.

________ is an example of an element.

How can radiation be controlled and safely used in medicine?

A fossil was found and determined by radiometric dating to be 11,400 years old.What is the ratio of carbon-14 to carbon-12 in this fossil compared to its environment?

How many oxygen atoms are in the products of the following reaction? C₆H₁₂O₆ + 6 H₂O + 6 O₂ → 6 CO₂ + 12 H₂O

What name is given to substances that resist changes in pH?

Sweating cools your body by ________.

Adjacent water molecules are joined by ________ bonds.

Why is water considered a polar molecule?

The graph below shows data regarding radioactive decay of carbon-14.If decay continues to occur normally,how much C-14 will remain after 22,800 years?

Which of the following is NOT a potential impact of ocean acidification?

Which of the following is an acid?

Which of the following elements,essential to life,is a trace element?

Why (if you are careful)are you able to float a needle on the surface of water?

The tendency of molecules of the same kind to stick together is called ________.

Examine the drawing of an atom below.The art is technically INCORRECT in that ________.

When a base is added to a buffered solution,the buffer will ________.

An atom with an electrical charge is a(n)________.

Introduction: Biology Today

The Molecules of Life

A Tour of the Cell

The Working Cell

Cellular Respiration: Obtaining Energy from Food

Photosynthesis: Using Light to Make Food

Cellular Reproduction: Cells from Cells

Patterns of Inheritance

The Structure and Function of DNA

How Genes Are Controlled

DNA Technology

How Populations Evolve

How Biological Diversity Evolves

The Evolution of Microbial Life

The Evolution of Plants and Fungi

The Evolution of Animals

An Introduction to Ecology and the Biosphere

Population Ecology

Communities and Ecosystems

Unifying Concepts of Animal Structure and Function

Nutrition and Digestion

Circulation and Respiration

The Body's Defenses

Hormones

Reproduction and Development

Nervous, Sensory, and Locomotor Systems

The Life of a Flowering Plant

The Working Plant

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