Question 1

Subatomic particles located around the nucleus of an atom are

Accepted Answer

A)   electrons.
B)   neutrons.
C)   photons.
D)   protons.
E)   neutrinos.F) All of the above
G) A) and E)

Question 2

An enzyme

Accepted Answer

A)   has a two-dimensional shape.
B)   is a protein catalyst.
C)   increases the activation energy needed in a chemical reaction.
D)   cannot be denatured.
E)   is permanently changed in a chemical reaction.F) C) and D)
G) A) and E)

Question 3

A neutral atom contains

Accepted Answer

A)   more protons than electrons.
B)   more electrons than protons.
C)   the same number of electrons and protons.
D)   only neutrons.
E)   None of these choices is correct.F) A) and B)
G) C) and E)

Question 4

An individual hydrogen bond in a sample of water would be described as:

Accepted Answer

A)   strong and intramolecular.
B)   weak and intramolecular.
C)   weak and intermolecular.
D)   strong and intermolecular.E) B) and C)
F) C) and D)

Question 5

The pH value

Accepted Answer

A)   is determined by the concentration of hydrogen ions.
B)   decreases with alkalinity.
C)   is measured on a scale from 0 to 10.
D)   reflects the sodium content of body fluids.
E)   increases with acidity.F) C) and E)
G) C) and D)

Question 6

From the following list, select the one organic substance found in the human body.

Accepted Answer

A)   water
B)   glucose
C)   oxygen
D)   calciumE) A) and B)
F) A) and C)

Question 7

Fatty acid A has 10 double covalent bonds scattered throughout its carbon chain while fatty acid B has only single covalent bonds between the carbons in its chain.

Accepted Answer

A)   Fatty acid A is saturated.
B)   Both fatty acids are saturated.
C)   Both fatty acids are unsaturated.
D)   Fatty acid B is saturated.
E)   Fatty acid B is unsaturated.F) B) and E)
G) C) and D)

Question 8

Which of the following means a change in shape of a protein?

Accepted Answer

A)   primary structure of protein
B)   peptide bond
C)   denaturation
D)   amino acid
E)   secondary structure of proteinF) A) and B)
G) A) and C)

Question 9

The presence of water in our bodies allows us to

Accepted Answer

A)   cool the body with sweat.
B)   maintain a fairly constant body temperature.
C)   provide an environment for chemical reactions.
D)   keep tissues moist and reduce friction.
E)   All of these choices are correct.F) B) and E)
G) A) and B)

Question 10

What type of covalent bond is formed between amino acid molecules during protein synthesis?

Accepted Answer

A)   electrovalent bond
B)   amino bond
C)   peptide bond
D)   hydrogen bond
E)   primary bondF) C) and D)
G) C) and E)

Question 11

Carbon dioxide is considered a(n)

Accepted Answer

A)   compound.
B)   molecule.
C)   ion.
D)   element.
E)   molecule and a compound.F) A) and B)
G) None of the above

Question 12

Phospholipids

Accepted Answer

A)   are fat-soluble vitamins.
B)   are found in cell membranes.
C)   contain subunits called amino acids.
D)   are water-soluble.
E)   are a type of steroid.F) D) and E)
G) B) and D)

Question 13

-Phospholipids are important components of the plasma membrane. What does "C" represent on the diagram?

Accepted Answer

A)   phosphorus
B)   oxygen
C)   nitrogen
D)   polar (hydrophilic)  region
E)   nonpolar (hydrophobic)  regionF) B) and D)
G) B) and C)

Question 14

Electrolytes are substances that

Accepted Answer

A)   are NOT found in the human body in any appreciable amounts.
B)   form covalent bonds with water.
C)   cannot conduct electricity in solution.
D)   are NOT charged particles.
E)   conduct electricity when dissolved in water.F) B) and C)
G) A) and E)

Question 15

Denaturation is

Accepted Answer

A)   a change in the three-dimensional structure of a protein.
B)   a negatively charged ion.
C)   a substance that conducts electricity when placed in solution.
D)   a positively charged ion.
E)   a combination of atoms held together by chemical bonds.F) B) and D)
G) B) and E)

Question 16

Which of the following would be classified as a lipid?

Accepted Answer

A)   catalase-an enzyme
B)   alanine-an amino acid
C)   starch-a polysaccharide
D)   cholesterol-a steroid
E)   sucrose-a disaccharideF) A) and B)
G) B) and E)

Question 17

Which of the following is the correct sequence from smallest to largest?

Accepted Answer

A)   amino acid, cell, protein, atom
B)   protein, cell, amino acid, atom
C)   amino acid, atom, cell, protein
D)   atom, amino acid, protein, cell
E)   cell, protein, amino acid, atomF) B) and D)
G) B) and C)

Question 18

When the hydrogen bonds that maintain a protein's three-dimensional shape are broken, the protein becomes nonfunctional, and is said to be

Accepted Answer

A)   unsaturated.
B)   essential.
C)   saturated.
D)   denatured.
E)   structural.F) B) and D)
G) B) and C)

Question 19

Chemical reactions with the property of being able to proceed from reactants to products and from products to reactants are called

Accepted Answer

A)   synthesis reactions.
B)   decomposition reactions.
C)   exchange reactions.
D)   reversible reactions.
E)   net reaction rates.F) None of the above
G) All of the above

Question 20

Polysaccharides

Accepted Answer

A)   are the smallest carbohydrates.
B)   contain carbon, hydrogen, and phosphate atoms.
C)   are not found in plants.
D)   contain long chains of monosaccharides.
E)   are formed when sucrose and glucose combine.F) A) and B)
G) A) and C)

Exam 2: The Chemical Basis of Life

Fatty acid A has 10 double covalent bonds scattered throughout its carbon chain while fatty acid B has only single covalent bonds between the carbons in its chain.

Correct AnswerverifiedShow Answer

Electrolytes are substances that

Correct AnswerverifiedShow Answer

Carbon dioxide is considered a(n)

Correct AnswerverifiedShow Answer

The pH value

Correct AnswerverifiedShow Answer

Phospholipids

Correct AnswerverifiedShow Answer

Which of the following is the correct sequence from smallest to largest?

Correct AnswerverifiedShow Answer

Denaturation is

Correct AnswerverifiedShow Answer

What type of covalent bond is formed between amino acid molecules during protein synthesis?

Correct AnswerverifiedShow Answer

A neutral atom contains

Correct AnswerverifiedShow Answer

From the following list, select the one organic substance found in the human body.

Correct AnswerverifiedShow Answer

Chemical reactions with the property of being able to proceed from reactants to products and from products to reactants are called

Correct AnswerverifiedShow Answer

Polysaccharides

Correct AnswerverifiedShow Answer

The presence of water in our bodies allows us to

Correct AnswerverifiedShow Answer

Subatomic particles located around the nucleus of an atom are

Correct AnswerverifiedShow Answer

An individual hydrogen bond in a sample of water would be described as:

Correct AnswerverifiedShow Answer

An enzyme

Correct AnswerverifiedShow Answer

-Phospholipids are important components of the plasma membrane. What does "C" represent on the diagram?

Correct AnswerverifiedShow Answer

When the hydrogen bonds that maintain a protein's three-dimensional shape are broken, the protein becomes nonfunctional, and is said to be

Correct AnswerverifiedShow Answer

Which of the following means a change in shape of a protein?

Correct AnswerverifiedShow Answer

Which of the following would be classified as a lipid?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified