Question 1

________ molecules are nonpolar molecules that are repelled by water.

Accepted Answer

The answer of ________ molecules are nonpolar molecules that are...

Question 2

Which of the following is the largest in size?

Accepted Answer

A) glucose 
B) protein 
C) carbon atom 
D) nucleotide 
A) glucose 
B) protein 
C) carbon atom 
D) nucleotide

Question 3

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 4

A disaccharide consists of two

Accepted Answer

A) sugars. 
B) hydrocarbons. 
C) fatty acids. 
D) amino acids. 
A) sugars. 
B) hydrocarbons. 
C) fatty acids. 
D) amino acids.

Question 5

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 6

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 7

Based on the water molecule pictured below, which of the labeled areas 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

Question 8

In making your morning tea, you drop a sugar cube into some hot water. You stir the mixture but no longer see the sugar cube at the bottom of your mug. Based on your observation of sugar dissolving in hot water, you properly conclude that the sugar is

Accepted Answer

A) hydrophobic. 
B) nonpolar. 
C) hydrophilic. 
D) inert. 
A) hydrophobic. 
B) nonpolar. 
C) hydrophilic. 
D) inert.

Question 9

We use soap to clean ourselves better than we could with water alone. Soaps contain phospholipids that are responsible for the cleansing action. Which of the following statements is the most likely explanation for how soaps work?

Accepted Answer

A) Phospholipids are ions and therefore mix with both the water and oily dirt. 
B) Phospholipids are completely hydrophilic, and therefore oily dirt takes the place of the phospholipid molecules that would be dissolved in the rinse. 
C) The phospholipid tail attaches to the oily dirt while the phospholipid head interacts with the rinse water and carriers the dirt (and soap) away with it. 
D) The nonpolar fatty acid chains that make up the heads of the phospholipid are hydrophilic, and thus are repelled by the water. 
A) Phospholipids are ions and therefore mix with both the water and oily dirt. 
B) Phospholipids are completely hydrophilic, and therefore oily dirt takes the place of the phospholipid molecules that would be dissolved in the rinse. 
C) The phospholipid tail attaches to the oily dirt while the phospholipid head interacts with the rinse water and carriers the dirt (and soap) away with it. 
D) The nonpolar fatty acid chains that make up the heads of the phospholipid are hydrophilic, and thus are repelled by the water.

Question 10

How many atoms are present in a single molecule of C₈H₁₀N₄O₂?

Accepted Answer

A) 4 
B) 8 
C) 12 
D) 24 
A) 4 
B) 8 
C) 12 
D) 24

Question 11

The chemical reaction that represents photosynthesis is 6 H₂O + 6 CO₂ à C₆H₁₂O₆ + 6 O₂. What are the reactants?

Accepted Answer

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

Question 12

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 13

The class of macromolecules that do NOT form true polymers are the ________.

Accepted Answer

The answer of The class of macromolecules that do NOT...

Question 14

After giving a baby a bath, a new mom applies baby oil to her child's skin. How does the baby oil help the baby's skin to retain moisture throughout the day? Explain the chemical basis of water retention in this example.

Accepted Answer

Because the oil is hydrophobic and the w

Question 15

There are four major classes of macromolecules that are found in living systems and each uses a carbon skeleton as its structural backbone. Why is carbon regularly assembled to make important biological molecules?

Accepted Answer

All of the major biological molecules (m

Question 16

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.

Question 17

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 18

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.

Exam 2: Chemistry of Life

________ molecules are nonpolar molecules that are repelled by water.

Which of the following is the largest in size?

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

A disaccharide consists of two

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

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

Based on the water molecule pictured below, which of the labeled areas possesses a partial negative charge?

In making your morning tea, you drop a sugar cube into some hot water. You stir the mixture but no longer see the sugar cube at the bottom of your mug. Based on your observation of sugar dissolving in hot water, you properly conclude that the sugar is

We use soap to clean ourselves better than we could with water alone. Soaps contain phospholipids that are responsible for the cleansing action. Which of the following statements is the most likely explanation for how soaps work?

How many atoms are present in a single molecule of C₈H₁₀N₄O₂?

The chemical reaction that represents photosynthesis is 6 H₂O + 6 CO₂ à C₆H₁₂O₆ + 6 O₂. What are the reactants?

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.

The class of macromolecules that do NOT form true polymers are the ________.

After giving a baby a bath, a new mom applies baby oil to her child's skin. How does the baby oil help the baby's skin to retain moisture throughout the day? Explain the chemical basis of water retention in this example.

There are four major classes of macromolecules that are found in living systems and each uses a carbon skeleton as its structural backbone. Why is carbon regularly assembled to make important biological molecules?

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

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

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

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

Homeostasis, Reproduction, and Development

Digestive, Muscular, and Skeletal Systems

Circulatory, Respiratory, Urinary, and Nervous Systems

Endocrine and Immune Systems

Plant Physiology

Applying the Science

Filters