Question 1

In living systems,a critical component of many reactions is

Accepted Answer

A) carbon dioxide. 
B) calcium. 
C) water. 
D) hydrogen sulfide. 
A) carbon dioxide. 
B) calcium. 
C) water. 
D) hydrogen sulfide.

Question 2

Nitrogen has an atomic number of 7 and an atomic mass number of 14.Using the image provided,diagram the location and number of protons,neutrons,and electrons in nitrogen.

Accepted Answer

The atomic number tells us the number of

Question 3

Which of the following factors explains carbon's prominence in living systems?

Accepted Answer

A) Carbon forms weak reversible bonds. 
B) Carbon bonds with up to three other atoms. 
C) Carbon-based molecules can form long chains and rings. 
D) Carbon does not form small molecules. 
A) Carbon forms weak reversible bonds. 
B) Carbon bonds with up to three other atoms. 
C) Carbon-based molecules can form long chains and rings. 
D) Carbon does not form small molecules.

Question 4

Which of the following amino acids begins the construction of all proteins in the human body?

Accepted Answer

A) methionine 
B) leucine 
C) proline 
D) tryptophan 
A) methionine 
B) leucine 
C) proline 
D) tryptophan

Question 5

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.

Question 6

A scientist observed a chemical that changes to bright red in the presence of organic compounds containing nitrogen and phosphorus.To test this chemical,a set of test tubes each containing a purified sample of one of the following organic compounds is prepared.The chemical is then added to each tube.Which test tube will always turn bright red?

Accepted Answer

A) the tube containing nucleic acids 
B) the tube containing proteins 
C) the tube containing carbohydrates 
D) the tube containing phospholipids 
A) the tube containing nucleic acids 
B) the tube containing proteins 
C) the tube containing carbohydrates 
D) the tube containing phospholipids

Question 7

Neighboring water molecules are held together with hydrogen bonds because

Accepted Answer

A) partially negatively charged oxygen atoms and partially positively charged hydrogen atoms on separate water molecules are attracted to one another. 
B) the hydrogen and oxygen atoms within a single water molecule share electrons equally. 
C) the oxygen and hydrogen atoms that participate in hydrogen bonding are sharing electons within a single valence shell. 
D) ionic interactions repel water molecules from hydrophobic oils that may be present in a solution. 
A) partially negatively charged oxygen atoms and partially positively charged hydrogen atoms on separate water molecules are attracted to one another. 
B) the hydrogen and oxygen atoms within a single water molecule share electrons equally. 
C) the oxygen and hydrogen atoms that participate in hydrogen bonding are sharing electons within a single valence shell. 
D) ionic interactions repel water molecules from hydrophobic oils that may be present in a solution.

Question 8

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 easily mix together. 
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 easily mix together. 
C) water has hydrogen bonds and oil is polar. 
D) water and oil are covalently bonded together.

Question 9

Which of the following most commonly represents the shape associated with functional proteins?

Accepted Answer

A) a long linear chain of amino acids 
B) individual amino acids that are not covalently joined together 
C) coils and sheets of joined amino acids 
D) three-dimensional folded chains of amino acids 
A) a long linear chain of amino acids 
B) individual amino acids that are not covalently joined together 
C) coils and sheets of joined amino acids 
D) three-dimensional folded chains of amino acids

Question 10

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

Question 11

How many different amino acids are used to build proteins?

Accepted Answer

A) 90 
B) 20 
C) 19 
D) 4 
A) 90 
B) 20 
C) 19 
D) 4

Question 12

MATCHING
Using the answer choices below (a through d), match the characteristic with its macromolecule class.
-form the major framework of biological membranes

Accepted Answer

A) lipids 
B) carbohydrates 
C) nucleic acids 
D) proteins 
A) lipids 
B) carbohydrates 
C) nucleic acids 
D) proteins

Question 13

Which of the following solutions has the highest concentration of free H⁺ ions?

Accepted Answer

A) pH 1 
B) pH 4 
C) pH 7 
D) pH 14 
A) pH 1 
B) pH 4 
C) pH 7 
D) pH 14

Question 14

When sodium chloride (Na⁺Cl⁻)is dissolved in water,the sodium ion

Accepted Answer

A) is attracted to the hydrogen atoms of water molecules. 
B) is repelled by the oxygen atoms of water molecules. 
C) is attracted to other sodium ions that are being dissolved. 
D) is attracted to the oxygen atoms of water molecules. 
A) is attracted to the hydrogen atoms of water molecules. 
B) is repelled by the oxygen atoms of water molecules. 
C) is attracted to other sodium ions that are being dissolved. 
D) is attracted to the oxygen atoms of water molecules.

Question 15

Which of the following could be built solely from glucose molecules?

Accepted Answer

A) fatty acids 
B) DNA 
C) oils 
D) starch 
A) fatty acids 
B) DNA 
C) oils 
D) starch

Question 16

Nucleotides

Accepted Answer

A) are the building blocks of proteins. 
B) are involved in every chemical reaction in the cell. 
C) form physical structures such as hair. 
D) are the building blocks of nucleic acids. 
A) are the building blocks of proteins. 
B) are involved in every chemical reaction in the cell. 
C) form physical structures such as hair. 
D) are the building blocks of nucleic acids.

Question 17

MATCHING
Using the answer choices below (a through d), match the characteristic with its macromolecule class.
-store and transmit genetic information

Accepted Answer

A) lipids 
B) carbohydrates 
C) nucleic acids 
D) proteins 
A) lipids 
B) carbohydrates 
C) nucleic acids 
D) proteins

Question 18

MATCHING
Using the answer choices below (a through d), match the characteristic with its macromolecule class.
-act as short-term energetic molecules

Accepted Answer

A) lipids 
B) carbohydrates 
C) nucleic acids 
D) proteins 
A) lipids 
B) carbohydrates 
C) nucleic acids 
D) proteins

Question 19

The subatomic particles that possess a single negative charge and surround the nucleus are the

Accepted Answer

A) isotopes. 
B) protons. 
C) neutrons. 
D) electrons. 
A) isotopes. 
B) protons. 
C) neutrons. 
D) electrons.

Question 20

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

In living systems,a critical component of many reactions is

Nitrogen has an atomic number of 7 and an atomic mass number of 14.Using the image provided,diagram the location and number of protons,neutrons,and electrons in nitrogen.

Which of the following factors explains carbon's prominence in living systems?

Which of the following amino acids begins the construction of all proteins in the human body?

An acid is a polar substance that dissolves in water and

Neighboring water molecules are held together with hydrogen bonds because

Oil and water do not mix together well because

Which of the following most commonly represents the shape associated with functional proteins?

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

How many different amino acids are used to build proteins?

MATCHING Using the answer choices below (a through d), match the characteristic with its macromolecule class. -form the major framework of biological membranes

Which of the following solutions has the highest concentration of free H⁺ ions?

When sodium chloride (Na⁺Cl⁻)is dissolved in water,the sodium ion

Which of the following could be built solely from glucose molecules?

Nucleotides

MATCHING Using the answer choices below (a through d), match the characteristic with its macromolecule class. -store and transmit genetic information

MATCHING Using the answer choices below (a through d), match the characteristic with its macromolecule class. -act as short-term energetic molecules

The subatomic particles that possess a single negative charge and surround the nucleus are the

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

The Nature of Science

Life Is Cellular

How Cells Work

Cell Division

Patterns of Inheritance

Chromosomes and Human Genetics

What Genes Are

How Genes Work

Evidence for Evolution

Mechanisms of Evolution

Adaptation and Species

The History of Life

Human Evolution

General Principles of Ecology

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Exam 2: Chemistry of Life

In living systems,a critical component of many reactions is

Nitrogen has an atomic number of 7 and an atomic mass number of 14.Using the image provided,diagram the location and number of protons,neutrons,and electrons in nitrogen.

Which of the following factors explains carbon's prominence in living systems?

Which of the following amino acids begins the construction of all proteins in the human body?

An acid is a polar substance that dissolves in water and

Neighboring water molecules are held together with hydrogen bonds because

Oil and water do not mix together well because

Which of the following most commonly represents the shape associated with functional proteins?

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

How many different amino acids are used to build proteins?

MATCHING Using the answer choices below (a through d), match the characteristic with its macromolecule class. -form the major framework of biological membranes

Which of the following solutions has the highest concentration of free H⁺ ions?

When sodium chloride (Na⁺Cl⁻)is dissolved in water,the sodium ion

Which of the following could be built solely from glucose molecules?

Nucleotides

MATCHING Using the answer choices below (a through d), match the characteristic with its macromolecule class. -store and transmit genetic information

MATCHING Using the answer choices below (a through d), match the characteristic with its macromolecule class. -act as short-term energetic molecules

The subatomic particles that possess a single negative charge and surround the nucleus are the

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

The Nature of Science

Life Is Cellular

How Cells Work

Cell Division

Patterns of Inheritance

Chromosomes and Human Genetics

What Genes Are

How Genes Work

Evidence for Evolution

Mechanisms of Evolution

Adaptation and Species

The History of Life

Human Evolution

General Principles of Ecology

Growth of Populations

Communities of Organisms

Ecosystems

Applying the Science

Filters