Question 1

Carbon is an example of a(n)

Accepted Answer

A)  compound. 
B)  macromolecule. 
C)  element. 
D)  amino acid. 
A)  compound. 
B)  macromolecule. 
C)  element. 
D)  amino acid. C

Question 2

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

Accepted Answer

The atomic number tells us the number of protons,whereas the atomic mass is the sum of protons and neutrons.Therefore,nitrogen has 7 protons,7 neutrons,and 7 electrons.In the diagram,students should demonstrate that there are 7 protons and 7 neutrons in the atomic nucleus.The 7 electrons should be drawn in the shells.

Question 3

Which of the labeled areas of the water molecule pictured below possesses a partial negative charge?

Accepted Answer

A)  A only 
B)  B only 
C)  C only 
D)  A and C 
A)  A only 
B)  B only 
C)  C only 
D)  A and C B

Question 4

Match the type of bond associated with each description.Terms may be used more than once.
-Some structure in a protein molecule is due to weak electrical attractions.

Accepted Answer

A) covalent 
B) hydrogen 
C) ionic 
A) covalent 
B) hydrogen 
C) ionic

Question 5

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 6

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 7

Ice floats on water because

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 8

A solution with a pH of 9 is more ________ than a solution with a pH of 7.

Accepted Answer

The answer of A solution with a pH of 9...

Question 9

During a study session,a Biology classmate holds up a bottle of water and mentions that there are both hydrogen bonds and covalent bonds found within the liquid.Explain your classmate's statement by describing the types of bonds that are found within your bottle of water.

Accepted Answer

Your classmate is correct in his or her

Question 10

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 11

O₂,also termed atmospheric oxygen,is formed by a covalent bond between two oxygen atoms.This type of bond involves oxygen atoms

Accepted Answer

A)  releasing protons. 
B)  releasing electrons. 
C)  sharing protons. 
D)  sharing electrons. 
A)  releasing protons. 
B)  releasing electrons. 
C)  sharing protons. 
D)  sharing electrons.

Question 12

Molecules with an uneven distribution of charge are described as ________.

Accepted Answer

The answer of Molecules with an uneven distribution of charge...

Question 13

The weak electrical attractions that form between two water molecules are called ________ bonds.

Accepted Answer

The answer of The weak electrical attractions that form between...

Question 14

Which of the following is likely to participate in ionic bonding?

Accepted Answer

A)  Li⁺ 
B)  H₂O 
C)  He 
D)  C₆H₁₂O₆ 
A)  Li⁺ 
B)  H₂O 
C)  He 
D)  C₆H₁₂O₆

Question 15

Carbon atoms are bound to each other by ________ bonds.

Accepted Answer

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

Question 16

The subatomic particles that possess a single negative charge,surround the nucleus,and are lost or gained by atoms called ions are the

Accepted Answer

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

Question 17

Match the type of bond associated with each description.Terms may be used more than once.
-An unequal sharing of electrons within an individual water molecule.

Accepted Answer

A) covalent 
B) hydrogen 
C) ionic 
A) covalent 
B) hydrogen 
C) ionic

Question 18

Match the type of bond associated with each description.Terms may be used more than once.
-A positively charged sodium ion is attracted to a negatively charged chloride ion to form table salt.

Accepted Answer

A) covalent 
B) hydrogen 
C) ionic 
A) covalent 
B) hydrogen 
C) ionic

Question 19

Macromolecules are typically formed by repetitively adding small monomers together.Which macromolecule is properly matched with the appropriate monomer?

Accepted Answer

A)  polypeptide-amino acid 
B)  nucleic acid-amino acid 
C)  polysaccharide-nucleotide 
D)  triglyceride-cholesterol 
A)  polypeptide-amino acid 
B)  nucleic acid-amino acid 
C)  polysaccharide-nucleotide 
D)  triglyceride-cholesterol

Question 20

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

Exam 3: Chemistry of Life

Carbon is an example of a(n)

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

Which of the labeled areas of the water molecule pictured below possesses a partial negative charge?

Match the type of bond associated with each description.Terms may be used more than once. -Some structure in a protein molecule is due to weak electrical attractions.

The central element found in organic molecules is

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

Ice floats on water because

A solution with a pH of 9 is more ________ than a solution with a pH of 7.

During a study session,a Biology classmate holds up a bottle of water and mentions that there are both hydrogen bonds and covalent bonds found within the liquid.Explain your classmate's statement by describing the types of bonds that are found within your bottle of water.

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.

O₂,also termed atmospheric oxygen,is formed by a covalent bond between two oxygen atoms.This type of bond involves oxygen atoms

Molecules with an uneven distribution of charge are described as ________.

The weak electrical attractions that form between two water molecules are called ________ bonds.

Which of the following is likely to participate in ionic bonding?

Carbon atoms are bound to each other by ________ bonds.

The subatomic particles that possess a single negative charge,surround the nucleus,and are lost or gained by atoms called ions are the

Match the type of bond associated with each description.Terms may be used more than once. -An unequal sharing of electrons within an individual water molecule.

Match the type of bond associated with each description.Terms may be used more than once. -A positively charged sodium ion is attracted to a negatively charged chloride ion to form table salt.

Macromolecules are typically formed by repetitively adding small monomers together.Which macromolecule is properly matched with the appropriate monomer?

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

The Nature of Science

Evaluating Scientific Claims

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

Bacteria and Archaea

Plants, Fungi, and Protists

Animals and Human Evolution

General Principles of Ecology

Growth of Populations

Communities of Organisms

Ecosystems

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