Question 1

The monomers linked together in DNA are called ____________.

Accepted Answer

The answer of The monomers linked together in DNA are...

Question 2

Phospholipids are found in cell membranes.

Accepted Answer

A) True 
 B)False

Question 3

This figure shows the chemical structure and space-filling models for stearic acid and oleic acid.
   
The reason oleic acid is slightly bent (as compared to stearic acid) is that it contains a _____ ______ between two of its carbon atoms.

Accepted Answer

The answer of This figure shows the chemical structure and...

Question 4

One function of nucleotides is energy transfer. Carbohydrates can be used to store energy. These related processes are important because

Accepted Answer

A)  if we could not store and transfer energy, we would have to match our energy input (eating) exactly to our energy requirements, even when sleeping. 
B)  there are not enough kinds of amino acids for proteins to be used as energy storage molecules. 
C)  energy transfer and storage are processes that are unique to humans, and therefore are used to determine the classification of people. 
D)  energy transfer is how we take the energy we gather from photosynthesis and transfer it into water molecules for later use when we need energy. 
A)  if we could not store and transfer energy, we would have to match our energy input (eating) exactly to our energy requirements, even when sleeping. 
B)  there are not enough kinds of amino acids for proteins to be used as energy storage molecules. 
C)  energy transfer and storage are processes that are unique to humans, and therefore are used to determine the classification of people. 
D)  energy transfer is how we take the energy we gather from photosynthesis and transfer it into water molecules for later use when we need energy.

Question 5

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 6

The atoms in water molecules are held together by hydrogen bonds.

Accepted Answer

A) True 
 B)False

Question 7

Nonpolar molecules are highly charged.

Accepted Answer

A) True 
 B)False

Question 8

You add a watery solution to another solution and find that the pH drops from 8 to 3. You have added a(n)

Accepted Answer

A)  buffer. 
B)  acid. 
C)  phospholipid. 
D)  base. 
A)  buffer. 
B)  acid. 
C)  phospholipid. 
D)  base.

Question 9

Lipids with a four-ring structure are called __________.

Accepted Answer

The answer of Lipids with a four-ring structure are called...

Question 10

A scientists finds a chemical that changes to bright red in the presence of organic compounds containing nitrogen and phosphorus. To test this chemical, you prepare a set of test tubes each containing a purified sample of one of the following organic compounds. You then add the chemical 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 11

Electrons are found

Accepted Answer

A)  in the nucleus of an atom. 
B)  only in complex molecules. 
C)  in a shell that surrounds 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 a shell that surrounds the atom's nucleus. 
D)  in both the nucleus and inner shell of an atom.

Question 12

The uncharged component in the core of atoms is a(n) ____________.

Accepted Answer

The answer of The uncharged component in the core of...

Question 13

Which of the following combinations of atoms would form ionic bonds?

Accepted Answer

A)  H+ and O 
B)  Na+ and K+ 
C)  Na+ and Cl- 
D)  PO₄- and I₂- 
A)  H+ and O 
B)  Na+ and K+ 
C)  Na+ and Cl- 
D)  PO₄- and I₂-

Question 14

The sum of an atom's protons and neutrons is its ________ _______.

Accepted Answer

The answer of The sum of an atom's protons and...

Question 15

In the chemical reaction C₆H₁₂O₆+6O₂→6CO₂+6H₂O, _____ are considered reactants.

Accepted Answer

A)  CO₂; and H₂O 
B)  O₂ and H₂O 
C)  C₆H₁₂O₆ and O₂ 
D)  C₆H₁₂O₆ and CO₂ 
A)  CO₂; and H₂O 
B)  O₂ and H₂O 
C)  C₆H₁₂O₆ and O₂ 
D)  C₆H₁₂O₆ and CO₂

Question 16

This figure shows the chemical structure and space-filling models for stearic acid and oleic acid.  
Although the fatty acids stearic acid and oleic acid have the same number of carbon atoms, they have different three-dimensional structures. Oleic acid has a slight bend in the middle. As a result,

Accepted Answer

A)  a pure sample of oleic acid would be more liquid than a pure sample of stearic acid. 
B)  stearic acid would be considered an unsaturated fatty acid. 
C)  you would be more likely to find stearic acid in the form of an oil than in the form of a fat. 
D)  oleic acid would be considered a saturated fatty acid. 
A)  a pure sample of oleic acid would be more liquid than a pure sample of stearic acid. 
B)  stearic acid would be considered an unsaturated fatty acid. 
C)  you would be more likely to find stearic acid in the form of an oil than in the form of a fat. 
D)  oleic acid would be considered a saturated fatty acid.

Question 17

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 18

In water, phospholipids arrange themselves such that

Accepted Answer

A)  their fatty acid head groups are facing the water. 
B)  their hydrophobic tails are kept away from the water. 
C)  saturated fatty acids face the water while unsaturated fatty acids are separated from the water. 
D)  the charged atoms on their fatty acid chains can interact directly with the water molecules. 
A)  their fatty acid head groups are facing the water. 
B)  their hydrophobic tails are kept away from the water. 
C)  saturated fatty acids face the water while unsaturated fatty acids are separated from the water. 
D)  the charged atoms on their fatty acid chains can interact directly with the water molecules.

Question 19

Proteins provide most of the energy for life processes.

Accepted Answer

A) True 
 B)False

Question 20

When phospholipids are added to water, they arrange themselves so that

Accepted Answer

A)  their hydrophobic tails are on the inside of a lipid droplet. 
B)  their hydrophilic tails are on the outside of a lipid droplet. 
C)  their hydrophobic heads are facing the water. 
D)  both A and C 
A)  their hydrophobic tails are on the inside of a lipid droplet. 
B)  their hydrophilic tails are on the outside of a lipid droplet. 
C)  their hydrophobic heads are facing the water. 
D)  both A and C

Exam 4: Chemical Building Blocks

The monomers linked together in DNA are called ____________.

Phospholipids are found in cell membranes.

This figure shows the chemical structure and space-filling models for stearic acid and oleic acid. The reason oleic acid is slightly bent (as compared to stearic acid) is that it contains a _____ ______ between two of its carbon atoms.

One function of nucleotides is energy transfer. Carbohydrates can be used to store energy. These related processes are important because

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

The atoms in water molecules are held together by hydrogen bonds.

Nonpolar molecules are highly charged.

You add a watery solution to another solution and find that the pH drops from 8 to 3. You have added a(n)

Lipids with a four-ring structure are called __________.

Electrons are found

The uncharged component in the core of atoms is a(n) ____________.

Which of the following combinations of atoms would form ionic bonds?

The sum of an atom's protons and neutrons is its ________ _______.

In the chemical reaction C₆H₁₂O₆+6O₂→6CO₂+6H₂O, _____ are considered reactants.

This figure shows the chemical structure and space-filling models for stearic acid and oleic acid. Although the fatty acids stearic acid and oleic acid have the same number of carbon atoms, they have different three-dimensional structures. Oleic acid has a slight bend in the middle. As a result,

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

In water, phospholipids arrange themselves such that

Proteins provide most of the energy for life processes.

When phospholipids are added to water, they arrange themselves so that

The Nature of Science and the Characteristics of Life

Organizing the Diversity of Life

Major Groups of Living Organisms

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy and Enzymes

Photosynthesis and Cellular Respiration

Cell Division

Patterns of Inheritance

Chromosomes and Human Genetics

DNA

From Gene to Protein

Control of Gene Expression

DNA Technology

How Evolution Works

Evolution of Populations

Adaptation and Speciation

The Evolutionary History of Life

Maintaining the Internal Environment

Animal Nutrition and Digestion

Gas Exchange

The Circulatory System

Animal Hormones

The Nervous System

Sensing the Environment

Skeletons, Muscles, and Movement

Defenses against Disease

Reproduction and Development

Animal Behavior

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

The Biosphere

Growth of Populations

Interactions among Organisms

Communities of Organisms

Ecosystems

Global Change

Biodiversity and People

Cancer: Cell Division Out of Control

Harnessing the Human Genome

Humans and Evolution

Smoking--Beyond Lung Cancer

Feeding a Hungry Planet

Building a Sustainable Society

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This figure shows the chemical structure and space-filling models for stearic acid and oleic acid. The reason oleic acid is slightly bent (as compared to stearic acid) is that it contains a _ __ between two of its carbon atoms.

The sum of an atom's protons and neutrons is its __ _.