Question 1

A carwash attendant offers to treat your windshield with a protective agent.This substance coats the glass,causing beads of water to easily roll off during a rain shower.Which of the following must be correct about the protective agent?

Accepted Answer

A)  It resists temperature changes well.
B)  It must be an acid.
C)  It is a polar substance.
D)  It must be hydrophobic.

Question 2

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

Question 3

Which of the following is the largest in size?

Accepted Answer

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

Question 4

Which of the following is a monomer that can be commonly made from components in Earth's atmosphere?

Accepted Answer

A)  nucleotides
B)  amino acids
C)  triglycerides
D)  monosaccharides

Question 5

Individual water molecules orient toward each other because of the ________ bonds that form between them.

Accepted Answer

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

Question 6

Carbon,hydrogen,and nitrogen are all examples of

Accepted Answer

A)  compounds.
B)  macromolecules.
C)  elements.
D)  amino acids.

Question 7

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. C

Question 8

If iodide ions (I⁻) were dissolved in water,they would be attracted to

Accepted Answer

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

Question 9

Nitrogen has seven protons,seven neutrons,and seven electrons.What is the atomic mass of nitrogen?

Accepted Answer

A)  0
B)  7
C)  14
D)  21

Question 10

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 11

A disaccharide consists of two

Accepted Answer

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

Question 12

The chemical reaction that represents photosynthesis is 6 H₂O + 6 CO₂ → 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.

Question 13

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

Accepted Answer

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

Question 14

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

Question 15

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 16

Which of the following distinguishes ionic bonds from covalent bonds?

Accepted Answer

A)  Ionic bonds form between the same two elements,whereas covalent bonds form between different elements.
B)  Ionic bonds hold together compounds that do not dissolve in water,whereas covalent bonds hold together molecules that dissolve in water.
C)  Ionic bonds hold together oppositely charged atoms,whereas covalent bonds hold together atoms that share electrons.
D)  Ionic bonds consist of atoms with partial charges,whereas covalent bonds consist of atoms with full positive and negative charges.

Question 17

Your supervisor provides you with lipids,carbohydrates,proteins,and nucleic acids and asks you to determine their chemical components.Which of the following elements would you NOT expect to find in these items?

Accepted Answer

A)  phosphorus
B)  iron
C)  hydrogen
D)  nitrogen

Question 18

A group of astronauts returning from outer space studied samples taken from their lunar landing.They found that one of their samples was coated with organic compounds.Which of the following statements must be correct about their samples?

Accepted Answer

A)  The compounds must be covered with ammonia (NH₃) and water vapor.
B)  The samples must lack water,but contain DNA.
C)  The samples must contain carbon atoms.
D)  The specimen must lack water,pesticides,and added hormones.

Question 19

Carbon atoms are bound to each other by

Accepted Answer

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

Question 20

MATCHING
Using the answer choices below (a through d) , match the characteristic with its macromolecule class.
-used to create steroid molecules like cholesterol

Accepted Answer

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

Exam 2: Chemistry of Life

A carwash attendant offers to treat your windshield with a protective agent.This substance coats the glass,causing beads of water to easily roll off during a rain shower.Which of the following must be correct about the protective agent?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

Which of the following is the largest in size?

Correct AnswerverifiedShow Answer

Which of the following is a monomer that can be commonly made from components in Earth's atmosphere?

Correct AnswerverifiedShow Answer

Individual water molecules orient toward each other because of the ________ bonds that form between them.

Correct AnswerverifiedShow Answer

Carbon,hydrogen,and nitrogen are all examples of

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedC

If iodide ions (I⁻) were dissolved in water,they would be attracted to

Correct AnswerverifiedShow Answer

Nitrogen has seven protons,seven neutrons,and seven electrons.What is the atomic mass of nitrogen?

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedYour classmate is correct in his or her ...View AnswerShow Answer

A disaccharide consists of two

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following distinguishes ionic bonds from covalent bonds?

Correct AnswerverifiedShow Answer

Your supervisor provides you with lipids,carbohydrates,proteins,and nucleic acids and asks you to determine their chemical components.Which of the following elements would you NOT expect to find in these items?

Correct AnswerverifiedShow Answer

A group of astronauts returning from outer space studied samples taken from their lunar landing.They found that one of their samples was coated with organic compounds.Which of the following statements must be correct about their samples?

Correct AnswerverifiedShow Answer

Carbon atoms are bound to each other by

Correct AnswerverifiedD

MATCHING Using the answer choices below (a through d) , match the characteristic with its macromolecule class. -used to create steroid molecules like cholesterol

Correct AnswerverifiedShow Answer

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C

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View Answer

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D

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