Question 1

In the laboratory you identify protein in a food item that you've tested.Which of the following must the food item also contain?

Accepted Answer

A) glucose 
B) lipids 
C) amino acids 
D) nucleotides 
A) glucose 
B) lipids 
C) amino acids 
D) nucleotides

Question 2

O₂,also termed atmospheric oxygen,is considered to be a molecule but not a compound.Why not?

Accepted Answer

A) It contains no covalent bonds. 
B) It contains a double covalent bond but not a single covalent bond. 
C) To be considered a compound there must be a minimum of three atoms;atmospheric oxygen is too small. 
D) Compounds are defined as molecules constructed from two or more different elements. 
A) It contains no covalent bonds. 
B) It contains a double covalent bond but not a single covalent bond. 
C) To be considered a compound there must be a minimum of three atoms;atmospheric oxygen is too small. 
D) Compounds are defined as molecules constructed from two or more different elements.

Question 3

Which of the following pieces of evidence would best demonstrate that a bacterium found on an asteroid originated in outer space?

Accepted Answer

A) the presence of volcanic ash on the outside of the bacterial cell 
B) the absence of common gases found in Earth's atmosphere 
C) the presence of right-handed amino acids in the bacterium's proteins 
D) the absence of hydrogen bonds between water molecules in the bacterial cell 
A) the presence of volcanic ash on the outside of the bacterial cell 
B) the absence of common gases found in Earth's atmosphere 
C) the presence of right-handed amino acids in the bacterium's proteins 
D) the absence of hydrogen bonds between water molecules in the bacterial cell

Question 4

The central element found in organic molecules is

Accepted Answer

A) calcium. 
B) carbon. 
C) silicon. 
D) sodium. 
A) calcium. 
B) carbon. 
C) silicon. 
D) sodium.

Question 5

Which of the following statements is true of proteins,carbohydrates,and nucleic acids?

Accepted Answer

A) All three are used to store genetic information. 
B) None of these macromolecules mixes well with water. 
C) Each of these molecules is built from a common set of monomers. 
D) All of these molecules are primarily used as energy-storage molecules. 
A) All three are used to store genetic information. 
B) None of these macromolecules mixes well with water. 
C) Each of these molecules is built from a common set of monomers. 
D) All of these molecules are primarily used as energy-storage molecules.

Question 6

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 7

MATCHING
Using the answer choices below (a through d), match the characteristic with its macromolecule class.
-exhibit various levels of structure

Accepted Answer

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

Question 8

MATCHING
Using the answer choices below (a through d), match the characteristic with its macromolecule class.
-speed chemical reactions

Accepted Answer

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

Question 9

When ammonia (NH₃)is dissolved in a solution,it accepts hydrogen ions from its surroundings.Ammonia is therefore

Accepted Answer

A) a base. 
B) an isotope. 
C) a salt. 
D) an acid. 
A) a base. 
B) an isotope. 
C) a salt. 
D) an acid.

Question 10

Chemists often represent the structure of atoms using p,n,and e to indicate the number of protons,neutrons,and electrons.Which atom would have an atomic weight of 30?

Accepted Answer

A) 15 p,15 n,15 e 
B) 10 p,10 n,10 e 
C) 15 p,0 n,15 e 
D) 0p,15n,15 e 
A) 15 p,15 n,15 e 
B) 10 p,10 n,10 e 
C) 15 p,0 n,15 e 
D) 0p,15n,15 e

Question 11

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 12

For each of the major classes of macromolecules,indicate the basic subunits used to build it.

Accepted Answer

Carbohydrates are composed of monomers c

Question 13

A solution with a pH of 3 is

Accepted Answer

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

Question 14

Antibodies are an important class of human proteins that function in immune defense.If scientists fragmented antibodies under laboratory conditions,what chemical building blocks would they recover?

Accepted Answer

A) monosaccharides 
B) phospholipids 
C) amino acids 
D) nitrogenous bases 
A) monosaccharides 
B) phospholipids 
C) amino acids 
D) nitrogenous bases

Question 15

Which of the following types of bonds hold hydrogen and oxygen atoms together within an individual water molecule?

Accepted Answer

A) hydrogen bond 
B) peptide bond 
C) polar covalent bond 
D) ionic bond 
A) hydrogen bond 
B) peptide bond 
C) polar covalent bond 
D) ionic bond

Question 16

MATCHING
Using the answer choices below (a through d), match the characteristic with its macromolecule class.
-participate in nearly every chemical reaction in living systems

Accepted Answer

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

Question 17

Lithium,with an atomic number of 3,has a tendency to lose electrons when it chemically bonds to another atom.What type of chemical bonds does lithium usually form with other atoms? Explain how you determined your answer.

Accepted Answer

When lithium loses electrons i

Question 18

When calcium (Ca++)and chloride (Cl⁻)interact with one another they bond using ________ bonds.

Accepted Answer

A) hydrogen 
B) peptide 
C) covalent 
D) ionic 
A) hydrogen 
B) peptide 
C) covalent 
D) ionic

Question 19

Which of the following explains why ice floats on water?

Accepted Answer

A) The crystal structure of ice is more regular than that seen in liquid water. 
B) The distance between water molecules in ice is greater than in liquid water. 
C) The cool temperature of ice reduces the extent of molecular motion relative to liquid water. 
D) When ice forms,the hydrogen bond in the water molecule becomes nonpolar;ice behaves like oil. 
A) The crystal structure of ice is more regular than that seen in liquid water. 
B) The distance between water molecules in ice is greater than in liquid water. 
C) The cool temperature of ice reduces the extent of molecular motion relative to liquid water. 
D) When ice forms,the hydrogen bond in the water molecule becomes nonpolar;ice behaves like oil.

Question 20

An instrument that identifies chemicals based upon their weights is the ________.

Accepted Answer

The answer of An instrument that identifies chemicals based upon...

In the laboratory you identify protein in a food item that you've tested.Which of the following must the food item also contain?

O₂,also termed atmospheric oxygen,is considered to be a molecule but not a compound.Why not?

Which of the following pieces of evidence would best demonstrate that a bacterium found on an asteroid originated in outer space?

The central element found in organic molecules is

Which of the following statements is true of proteins,carbohydrates,and nucleic acids?

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

MATCHING Using the answer choices below (a through d), match the characteristic with its macromolecule class. -exhibit various levels of structure

MATCHING Using the answer choices below (a through d), match the characteristic with its macromolecule class. -speed chemical reactions

When ammonia (NH₃)is dissolved in a solution,it accepts hydrogen ions from its surroundings.Ammonia is therefore

Chemists often represent the structure of atoms using p,n,and e to indicate the number of protons,neutrons,and electrons.Which atom would have an atomic weight of 30?

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

For each of the major classes of macromolecules,indicate the basic subunits used to build it.

A solution with a pH of 3 is

Antibodies are an important class of human proteins that function in immune defense.If scientists fragmented antibodies under laboratory conditions,what chemical building blocks would they recover?

Which of the following types of bonds hold hydrogen and oxygen atoms together within an individual water molecule?

MATCHING Using the answer choices below (a through d), match the characteristic with its macromolecule class. -participate in nearly every chemical reaction in living systems

Lithium,with an atomic number of 3,has a tendency to lose electrons when it chemically bonds to another atom.What type of chemical bonds does lithium usually form with other atoms? Explain how you determined your answer.

When calcium (Ca⁺⁺)and chloride (Cl⁻)interact with one another they bond using ________ bonds.

Which of the following explains why ice floats on water?

An instrument that identifies chemicals based upon their weights is the ________.

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

Exam 2: Chemistry of Life

In the laboratory you identify protein in a food item that you've tested.Which of the following must the food item also contain?

O₂,also termed atmospheric oxygen,is considered to be a molecule but not a compound.Why not?

Which of the following pieces of evidence would best demonstrate that a bacterium found on an asteroid originated in outer space?

The central element found in organic molecules is

Which of the following statements is true of proteins,carbohydrates,and nucleic acids?

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

MATCHING Using the answer choices below (a through d), match the characteristic with its macromolecule class. -exhibit various levels of structure

MATCHING Using the answer choices below (a through d), match the characteristic with its macromolecule class. -speed chemical reactions

When ammonia (NH₃)is dissolved in a solution,it accepts hydrogen ions from its surroundings.Ammonia is therefore

Chemists often represent the structure of atoms using p,n,and e to indicate the number of protons,neutrons,and electrons.Which atom would have an atomic weight of 30?

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

For each of the major classes of macromolecules,indicate the basic subunits used to build it.

A solution with a pH of 3 is

Antibodies are an important class of human proteins that function in immune defense.If scientists fragmented antibodies under laboratory conditions,what chemical building blocks would they recover?

Which of the following types of bonds hold hydrogen and oxygen atoms together within an individual water molecule?

MATCHING Using the answer choices below (a through d), match the characteristic with its macromolecule class. -participate in nearly every chemical reaction in living systems

Lithium,with an atomic number of 3,has a tendency to lose electrons when it chemically bonds to another atom.What type of chemical bonds does lithium usually form with other atoms? Explain how you determined your answer.

When calcium (Ca++)and chloride (Cl⁻)interact with one another they bond using ________ bonds.

Which of the following explains why ice floats on water?

An instrument that identifies chemicals based upon their weights is the ________.

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

When calcium (Ca⁺⁺)and chloride (Cl⁻)interact with one another they bond using ________ bonds.