Chapter 2 Quiz

Question 1

In an atom, the number of protons always equals the number of:

Answer 1

Electrons

Question 2

Isotopes of an element differ due to the number of:

Answer 2

Neutrons

Question 3

A combination of two or more atoms of the same type is called:

Answer 3

A molecule

Question 4

T or F: Water makes up 60-70% of total body weight.

Answer 4

True

Question 5

Which of the following characteristics of water is most responsible for the sinking of the Titanic:
• The temperature of liquid water rises and falls slowly
• Water has a high heat of evaporation
• Water is liquid at room temperature
• Frozen water is less dense than liquid water
• Water molecules are cohesive

Answer 5

Frozen water is less dense than liquid water

Question 6

T or F: A solution with a pH of 7 has 10 times as many H+ as a pH of 6.

Answer 6

False; The presence of H+ results in more acidity and the higher the number, the less H+ present in the solution.

Question 7

Which of the following is not one of the four classes of organic molecules found in cells?
• Proteins
• Nucleic acids
• Vitamins
• Lipids
• Carbohydrates

Answer 7

Vitamins

Question 8

T or F: A hydrolysis reaction involves the loss of water.

Answer 8

False

Question 9

Starch, cellulose, and glycogen are alike in that:

Answer 9

They are all made of glucose

Question 10

T or F: Fats are usually of animal origin while oils are usually of plant origin,

Answer 10

True

Question 11

The monomer unit of a protein is:

Answer 11

Amino acids

Question 12

An alpha helix or a beta sheet are examples of what level of protein structure?

Answer 12

Secondary

Question 13

List the properties of water:

Answer 13

High heat capacity
High heat of evaporation
Is a solvent
Cohesive and adhesive
Frozen water is less dense than liquid water