Question 1

The most versatile atom in living systems is ________.

Accepted Answer

The answer of The most versatile atom in living systems...

Question 2

Carbon dioxide is carried to the lungs in the blood.When it is dissolved in water,an acid is created.How does the body prevent your blood from becoming too acidic on the way to the lungs?

Accepted Answer

A)  Buffers in the blood release OH1- ions to make the blood more basic. 
B)  Buffers in the blood accept H+ ions to make the blood less acidic. 
C)  Buffers in the blood release HF+ to make the blood more basic. 
D)  Buffers in the blood accept OH - to make the blood less acidic. 
A)  Buffers in the blood release OH1- ions to make the blood more basic. 
B)  Buffers in the blood accept H+ ions to make the blood less acidic. 
C)  Buffers in the blood release HF+ to make the blood more basic. 
D)  Buffers in the blood accept OH - to make the blood less acidic.

Question 3

In organic compounds,carbon atoms are bound to each other by

Accepted Answer

A)  ionic bonds. 
B)  polar bonds. 
C)  hydrogen bonds. 
D)  covalent bonds. 
A)  ionic bonds. 
B)  polar bonds. 
C)  hydrogen bonds. 
D)  covalent bonds.

Question 4

After adding a small amount of Solution A to Solution B,the pH of Solution B declines from
8 to 3.Solution A must contain

Accepted Answer

A)  a salt. 
B)  an acid. 
C)  water only. 
D)  a base. 
A)  a salt. 
B)  an acid. 
C)  water only. 
D)  a base.

Question 5

Because they are made of hydrocarbon chains that repel water,the most hydrophobic of the four classes of organic compounds is the ________.

Accepted Answer

The answer of Because they are made of hydrocarbon chains...

Question 6

A solution with a pH of 3 is

Accepted Answer

A)  acidic. 
B)  nonpolar. 
C)  basic. 
D)  neutral. 
A)  acidic. 
B)  nonpolar. 
C)  basic. 
D)  neutral.

Question 7

An atom that becomes charged due to the gain or loss of an electron is called a(n)________.

Accepted Answer

The answer of An atom that becomes charged due to...

Question 8

Nucleic acids contain phosphorus but not sulfur.

Accepted Answer

A) True 
 B)False

Question 9

A molecule with the general formula CH2O is a(n)

Accepted Answer

A)  protein. 
B)  carbohydrate. 
C)  amino acid. 
D)  nucleic acid. 
A)  protein. 
B)  carbohydrate. 
C)  amino acid. 
D)  nucleic acid.

Question 10

An oil is a lipid that is ________ at room temperature.

Accepted Answer

A)  liquid 
B)  saturated 
C)  supersaturated 
D)  solid 
A)  liquid 
B)  saturated 
C)  supersaturated 
D)  solid

Question 11

You are given an unknown substance and asked to determine whether it is polar or nonpolar.The easiest way to do this would be to

Accepted Answer

A)  determine whether the compound is held together by hydrogen bonds. 
B)  determine the number of electrons in the compound's outer shell. 
C)  mix the compound with an ionic substance to see whether its bonds can withstand the pressure. 
D)  determine whether the compound dissolves in water. 
A)  determine whether the compound is held together by hydrogen bonds. 
B)  determine the number of electrons in the compound's outer shell. 
C)  mix the compound with an ionic substance to see whether its bonds can withstand the pressure. 
D)  determine whether the compound dissolves in water.

Question 12

One of the symptoms of kidney disease is the presence of proteins in a patient's urine.To quickly test for kidney disease using a urine sample,a doctor might add a chemical that causes a color change when

Accepted Answer

A)  nitrogen is present,but not oxygen. 
B)  nitrogen is present,but not phosphorus. 
C)  only oxygen and hydrogen are present. 
D)  only carbon and hydrogen are present. 
A)  nitrogen is present,but not oxygen. 
B)  nitrogen is present,but not phosphorus. 
C)  only oxygen and hydrogen are present. 
D)  only carbon and hydrogen are present.

Question 13

Oil and water do not mix together well because

Accepted Answer

A)  water is polar and oil is nonpolar. 
B)  only identical molecules of the same chemical can mix together easily. 
C)  water has hydrogen bonds and oil is polar. 
D)  water and oil are covalently bonded together. 
A)  water is polar and oil is nonpolar. 
B)  only identical molecules of the same chemical can mix together easily. 
C)  water has hydrogen bonds and oil is polar. 
D)  water and oil are covalently bonded together.

Question 14

Which of the following levels of protein structure involves more than one polypeptide chain?

Accepted Answer

A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary 
A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary

Question 15

The monomers that are linked together to form a DNA polymer are called ________.

Accepted Answer

The answer of The monomers that are linked together to...

Question 16

How many hydrogen atoms are in a molecule of C8H10N4O2?

Accepted Answer

A)  8 
B)  10 
C)  20 
D)  24 
A)  8 
B)  10 
C)  20 
D)  24

Question 17

A compound that maintains the pH of a solution by taking up or releasing hydrogen ions is called a ________.

Accepted Answer

The answer of A compound that maintains the pH of...

Question 18

Electrons are found

Accepted Answer

A)  in the nucleus of an atom. 
B)  only in complex molecules. 
C)  in one or more shells that surround the atom's nucleus. 
D)  in both the nucleus and inner shell of an atom. 
A)  in the nucleus of an atom. 
B)  only in complex molecules. 
C)  in one or more shells that surround the atom's nucleus. 
D)  in both the nucleus and inner shell of an atom.

Question 19

Which of the following is NOT a role of fatty acids in living organisms?

Accepted Answer

A)  energy storage 
B)  storage of genetic information 
C)  membrane construction 
D)  building blocks of fats 
A)  energy storage 
B)  storage of genetic information 
C)  membrane construction 
D)  building blocks of fats

Question 20

An acid is a polar substance that dissolves in water and

Accepted Answer

A)  becomes nonpolar. 
B)  leaves behind an OH- ion. 
C)  accepts hydrogen ions from the solution. 
D)  donates hydrogen ions to the solution. 
A)  becomes nonpolar. 
B)  leaves behind an OH- ion. 
C)  accepts hydrogen ions from the solution. 
D)  donates hydrogen ions to the solution.

Exam 2: The Chemistry of Life

The most versatile atom in living systems is ________.

Carbon dioxide is carried to the lungs in the blood.When it is dissolved in water,an acid is created.How does the body prevent your blood from becoming too acidic on the way to the lungs?

In organic compounds,carbon atoms are bound to each other by

After adding a small amount of Solution A to Solution B,the pH of Solution B declines from 8 to 3.Solution A must contain

Because they are made of hydrocarbon chains that repel water,the most hydrophobic of the four classes of organic compounds is the ________.

A solution with a pH of 3 is

An atom that becomes charged due to the gain or loss of an electron is called a(n)________.

Nucleic acids contain phosphorus but not sulfur.

A molecule with the general formula CH2O is a(n)

An oil is a lipid that is ________ at room temperature.

You are given an unknown substance and asked to determine whether it is polar or nonpolar.The easiest way to do this would be to

One of the symptoms of kidney disease is the presence of proteins in a patient's urine.To quickly test for kidney disease using a urine sample,a doctor might add a chemical that causes a color change when

Oil and water do not mix together well because

Which of the following levels of protein structure involves more than one polypeptide chain?

The monomers that are linked together to form a DNA polymer are called ________.

How many hydrogen atoms are in a molecule of C8H10N4O2?

A compound that maintains the pH of a solution by taking up or releasing hydrogen ions is called a ________.

Electrons are found

Which of the following is NOT a role of fatty acids in living organisms?

An acid is a polar substance that dissolves in water and

The Nature of Science and the Characteristics of Life

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy, Metabolism, and Enzymes

Photosynthesis and Cellular Respiration

Cell Division

Cancer and Human Health

Patterns of Inheritance

Chromosomes and Human Genetics

DNA and Genes

From Gene to Protein

DNA Technology

How Evolution Works

The Origin of Species

The Evolution of Biodiversity

Biological Diversity, Bacteria, and Archaea

Protista, Plantae, and Fungi

Animalia

The Biosphere

Growth of Populations

Animal Behavior

Ecological Communities

Ecosystems

Global Change

Internal Organization and Homeostasis

Nutrition and Digestion

Circulation and Gas Exchange

Animal Hormones

Nervous and Sensory Systems

Skeletons,Muscles,and Movement

The Immune System

Reproduction and Development

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

Filters

A molecule with the general formula CH₂O is a(n)

How many hydrogen atoms are in a molecule of C₈H₁₀N₄O₂?