Practice Quiz Q’s For Chapter 2

Question 1

_______________ are found in different energy levels outside the atom’s nucleus.

Answer 1

Electrons

Question 2

_______________ are subatomic particles with no charge.

Answer 2

Neutrons

Question 3

Atoms that share the same atomic number, but have different mass numbers are called ______________.

Answer 3

Isotopes

Question 4

In a double covalent bond, _________________ of electrons are shared.

Answer 4

Two pairs

Question 5

___________________bonding occurs between two atoms that share electrons equally.

Answer 5

non-polar covalent

Question 6

________________bonds maintain the complex shapes of large molecules such as proteins and nucleic acids

Answer 6

Hydrogen

Question 7

_______________bonding occurs when one atom transfers electrons to another.

Answer 7

Ionic

Question 8

Substances containing _______________ bonds are water-soluble.

Answer 8

polar covalent

Question 9

____________________reactions release energy.

Answer 9

Exergonic

Question 10

The two primary factors influencing activation energy are temperature and __________________________.

Answer 10

concentration of reactants

Question 11

In a ____________________reaction, products can be converted back into reactants.

Answer 11

Reversible

Question 12

In a ___________________reaction, a water molecule is used to split a large molecule into smaller molecules

Answer 12

hydrolysis

Question 13

An acid has a pH _____________ 7.

Answer 13

Less than

Question 14

___________are chemical compounds that help the body maintain homeostasis by preventing drastic changes in the pH of body fluids.

Answer 14

Buffers

Question 15

Glycogen and starch are examples of complex carbohydrates called ______________________.

Answer 15

Polysaccharides

Question 16

_______________________ are the monomers of nucleic acids

Answer 16

Nucleotides

Question 17

__________________fats are triglycerides that contain only single covalent bonds between carbon atoms.

Answer 17

Saturated

Question 18

The particular sequence of amino acids found in a protein is its ________________ structure.

Answer 18

primary

Question 19

___________________are the most abundant lipids in the body.

Answer 19

Triglycerides

Question 20

____________protein found in connective tissues and skin.

Answer 20

Collagen

Question 21

The smallest unit of matter that retains the properties and characteristics of an element is the:

Answer 21

Atom

Question 22

An atom of one element is distinguished from an atom of another element by the number of:

Answer 22

protons in the nucleus

Question 23

A physician suspects a patient may have a thyroid tumor. Which of the following radioisotopes will help the physician confirm the initial diagnosis?

Answer 23

iodine-131

Question 24

Each molecule of oxygen gas is composed of two atoms of oxygen sharing two pairs of electrons equally. Which of the following best describes the chemical bond between the oxygen atoms?

Answer 24

double nonpolar covalent bond

Question 25

The sum of all the chemical reactions that occur in the body is called anabolism. (True or False)

Answer 25

False

Question 26

A solute that readily dissolves in water is

Answer 26

hydrophilic

Question 27

Which of the following is a monosaccharide that is used by cells to produce energy?

Answer 27

glucose

Question 28

This type of fatty acid contains more than one double bond in its hydrocarbon chain.

Answer 28

polyunsaturated

Question 29

Which of the following is NOT true about phospholipids? a) They contain a glycerol backbone. b) The head group is polar. c) The molecule is an important part of cell membranes. d) The tail groups are nonpolar. e) They are a major form of energy storage.

Answer 29

E

Question 30

What are the nonpolar parts of phospholipids?

Answer 30

fatty acid tail groups

Question 31

This type of lipid is the body’s primary long-term energy storage molecule.

Answer 31

triglyceride

Question 32

This lipid is used by the body as a precursor for the production of steroid hormones.

Answer 32

cholesterol

Question 33

Which of the following is NOT a property of enzymes? a) Enzymes are catalytic proteins. b) Enzymes are highly specific. c) Enzymes are efficient. d) Enzymes are subject to a variety of cellular controls. e) Enzymes are irreversibly changed by the reactions that they catalyze.

Answer 33

E

Question 34

Which of the following is a purine base? a) cytosine b) guanine c) thymine d) uracil

Answer 34

B

Question 35

Which monomer is used to build RNA and DNA?

Answer 35

nucleotide

Question 36

Which of the following chemical elements present in the body is considered a trace element?

Answer 36

iodine

Question 37

Frying an egg causes the clear runny part of the egg to turn to white. This process is called

Answer 37

denaturation

Question 38

Does anabolism release large amounts of energy

Answer 38

No