Chapter 2 Quiz Flashcards Preview

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Flashcards in Chapter 2 Quiz Deck (13):
1

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

Electrons

2

Isotopes of an element differ due to the number of:

Neutrons

3

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

A molecule

4

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

True

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

Frozen water is less dense than liquid water

6

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

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

7

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

Vitamins

8

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

False

9

Starch, cellulose, and glycogen are alike in that:

They are all made of glucose

10

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

True

11

The monomer unit of a protein is:

Amino acids

12

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

Secondary

13

List the properties of water:

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