Question 1

Molecules that give up or donate hydrogen ions are ________.

Accepted Answer

acids

Question 2

Match the following.
-lipid that stabilizes membranes and is a precursor to many hormones

Accepted Answer

A) cholesterol 
B) unsaturated fat 
C) cellulose 
D) polypeptide 
E) glucose
F)saturated fat
G)DNA
H)glycogen 
A) cholesterol 
B) unsaturated fat 
C) cellulose 
D) polypeptide 
E) glucose
F)saturated fat
G)DNA
H)glycogen A

Question 3

The accompanying figure shows a triglyceride that contains unsaturated fatty acids.

Accepted Answer

A) True 
 B)False  False

Question 4

A student has isolated a large compound (macromolecule) from cells. Chemical analysis of the compound shows that it is made up of the following elements: carbon, hydrogen, oxygen, nitrogen, and sulfur. To which group of macromolecules does this compound most likely belong?

Accepted Answer

A)  carbohydrate 
B)  protein 
C)  nucleic acid 
D)  lipid 
E)  aqueous 
A)  carbohydrate 
B)  protein 
C)  nucleic acid 
D)  lipid 
E)  aqueous

Question 5

Which one of the following is a function of a protein?

Accepted Answer

A)  stores genetic material and enables its transmission to the next generation 
B)  acts as a catalyst, speeding up chemical reactions 
C)  is a major subunit of cellulose 
D)  is a primary structural component of a cell membrane 
E)  provides energy for a muscle contraction 
A)  stores genetic material and enables its transmission to the next generation 
B)  acts as a catalyst, speeding up chemical reactions 
C)  is a major subunit of cellulose 
D)  is a primary structural component of a cell membrane 
E)  provides energy for a muscle contraction

Question 6

Which one of the following is a molecule?

Accepted Answer

A)  NaCl 
B)  O 
C)  C 
D)  Lead 
E)  N 
A)  NaCl 
B)  O 
C)  C 
D)  Lead 
E)  N

Question 7

Match each of the following descriptions to the appropriate term. Each term may be used only once.
-different forms of the same element that differ in their number of neutrons

Accepted Answer

A) proton 
B) nucleic acids 
C) carbohydrates 
D) lipids 
E) isotopes
F)electrons
G)amino acids
H)atom
I)chemical bonds
J)matter
K)molecules
L)elements 
A) proton 
B) nucleic acids 
C) carbohydrates 
D) lipids 
E) isotopes
F)electrons
G)amino acids
H)atom
I)chemical bonds
J)matter
K)molecules
L)elements

Question 8

The difference between water molecules in liquid water and water molecules in ice is in the number of covalent bonds that form.

Accepted Answer

A) True 
 B)False

Question 9

The more buffers present in a body fluid, the more likely that the blood pH will change after absorbing nutrients during digestion.

Accepted Answer

A) True 
 B)False

Question 10

Molecules such as water are referred to as ________ because they are electrically neutral overall but still have partially charged regions.

Accepted Answer

A)  electrolytes 
B)  polar molecules 
C)  ions 
D)  covalently charged 
E)  isotopes 
A)  electrolytes 
B)  polar molecules 
C)  ions 
D)  covalently charged 
E)  isotopes

Question 11

Match each of the following descriptions to the appropriate term. Each term may be used only once.
-DNA, RNA

Accepted Answer

A) proton 
B) nucleic acids 
C) carbohydrates 
D) lipids 
E) isotopes
F)electrons
G)amino acids
H)atom
I)chemical bonds
J)matter
K)molecules
L)elements 
A) proton 
B) nucleic acids 
C) carbohydrates 
D) lipids 
E) isotopes
F)electrons
G)amino acids
H)atom
I)chemical bonds
J)matter
K)molecules
L)elements

Question 12

Plants produce a polysaccharide made of glucose known as ________, which is virtually indigestible by most animals.

Accepted Answer

The answer of Plants produce a polysaccharide made of glucose...

Question 13

If the number of protons in an atom equals the number of electrons in the atom, the atom is an ion.

Accepted Answer

A) True 
 B)False

Question 14

The pure form of matter that cannot be broken down into a simpler form is a(n) ________.

Accepted Answer

The answer of The pure form of matter that cannot...

Question 15

Use the letters from the accompanying figure to answer the following questions.
  
-The label ________ points to a neutron.

Accepted Answer

The answer of Use the letters from the accompanying figure...

Question 16

When a protein is heated, it may unfold, losing its secondary, tertiary, and even quaternary structure. This process is known as ________.

Accepted Answer

The answer of When a protein is heated, it may...

Question 17

________ bonds hold the hydrogens to the oxygen within a water molecule, and ________ bonds attract one water molecule to other water molecules.

Accepted Answer

A)  Ionic; hydrogen 
B)  Hydrogen; ionic 
C)  Hydrogen; covalent 
D)  Covalent; hydrogen 
E)  Ionic; covalent 
A)  Ionic; hydrogen 
B)  Hydrogen; ionic 
C)  Hydrogen; covalent 
D)  Covalent; hydrogen 
E)  Ionic; covalent

Question 18

Water held behind a dam has a large amount of ________ energy.

Accepted Answer

The answer of Water held behind a dam has a...

Question 19

Match the following.
-a molecule consisting of glycerol plus fatty acid chains with two hydrogen atoms per carbon atom; solid at room temperature

Accepted Answer

A) cholesterol 
B) unsaturated fat 
C) cellulose 
D) polypeptide 
E) glucose
F)saturated fat
G)DNA
H)glycogen 
A) cholesterol 
B) unsaturated fat 
C) cellulose 
D) polypeptide 
E) glucose
F)saturated fat
G)DNA
H)glycogen

Question 20

Use the letters from the accompanying figure to answer the following questions.
  
-Isotopes of this element would differ in the number of ________.

Accepted Answer

The answer of Use the letters from the accompanying figure...

Exam 2: The Chemistry of Living Things

Molecules that give up or donate hydrogen ions are ________.

Match the following. -lipid that stabilizes membranes and is a precursor to many hormones

The accompanying figure shows a triglyceride that contains unsaturated fatty acids.

A student has isolated a large compound (macromolecule) from cells. Chemical analysis of the compound shows that it is made up of the following elements: carbon, hydrogen, oxygen, nitrogen, and sulfur. To which group of macromolecules does this compound most likely belong?

Which one of the following is a function of a protein?

Which one of the following is a molecule?

Match each of the following descriptions to the appropriate term. Each term may be used only once. -different forms of the same element that differ in their number of neutrons

The difference between water molecules in liquid water and water molecules in ice is in the number of covalent bonds that form.

The more buffers present in a body fluid, the more likely that the blood pH will change after absorbing nutrients during digestion.

Molecules such as water are referred to as ________ because they are electrically neutral overall but still have partially charged regions.

Match each of the following descriptions to the appropriate term. Each term may be used only once. -DNA, RNA

Plants produce a polysaccharide made of glucose known as ________, which is virtually indigestible by most animals.

If the number of protons in an atom equals the number of electrons in the atom, the atom is an ion.

The pure form of matter that cannot be broken down into a simpler form is a(n) ________.

Use the letters from the accompanying figure to answer the following questions. -The label ________ points to a neutron.

When a protein is heated, it may unfold, losing its secondary, tertiary, and even quaternary structure. This process is known as ________.

________ bonds hold the hydrogens to the oxygen within a water molecule, and ________ bonds attract one water molecule to other water molecules.

Water held behind a dam has a large amount of ________ energy.

Match the following. -a molecule consisting of glycerol plus fatty acid chains with two hydrogen atoms per carbon atom; solid at room temperature

Use the letters from the accompanying figure to answer the following questions. -Isotopes of this element would differ in the number of ________.

Human Biology, Science, and Society

Structure and Function of Cells

From Cells to Organ Systems

The Skeletal System

The Muscular System

Blood

Heart and Blood Vessels

The Immune System and Mechanisms of Defense

The Respiratory System: Exchange of Gases

The Nervous System: Integration and Control

Sensory Mechanisms

The Endocrine System

The Digestive System and Nutrition

The Urinary System

Reproductive Systems

Cell Reproduction and Differentiation

Cancer: Uncontrolled Cell Division and Differentiation

Genetics and Inheritance

DNA Technology and Genetic Engineering

Development and Aging

Evolution and the Origins of Life

Ecosystems and Populations

Human Impacts, Biodiversity, and Environmental Issues

Filters

bonds hold the hydrogens to the oxygen within a water molecule, and bonds attract one water molecule to other water molecules.