Kuntzman/tortora A&p Ch.2 Introductory Chemistry Pretest

Front 1

A solution that contains equal numbers of hydrogen ion and hydroxide ions is?

Back 1

Neutral

Front 2

A peptide bond is formed

Back 2

When two amino acids are bonded together

Front 3

The phosphate portion of a phospholipid is

Back 3

Polar and can form hydrogen bonds with water molecules

Front 4

Approximately 96% of the body's mass is composed of the elements

Back 4

C, H, O, N

Front 5

One of the most important and most abundant inorganic compounds in the body is

Back 5

Water

Front 6

A substance with a pH of 5

Back 6

Has fewer H+ than a substance with a pH of 3

Front 7

Cellulose is a

Back 7

Polysaccharide

Front 8

If the outer electron shell is complete, the atom is

Back 8

Chemically Stable

Front 9

A covalent bond is formed

Back 9

When atoms share one or more electrons

Front 10

Which of the following are disaccharides?
A. glycogen, starch
B. glucose, fructose
C. cholesterol, triglyceride
D. sucrose, lactose

Back 10

D. Sucrose, Lactose

Front 11

Substances that ionize in water are called

Back 11

Electrolytes

Front 12

Which of the following represents a decomposition reaction?
A. Na+ + Cl- ----->NaCl
B. NaOH + HCl -----> HOH + NaCl
C. sucrose -----> glucose + fructose
D. C + D -----> AB

Back 12

C. sucrose -----> glucose + fructose

Front 13

The symbol Na+ represents a sodium atom that has lost

Back 13

An Electron

Front 14

An ionic bond is formed

Back 14

When one atom gains an electron and one atom loses an electron in the formation of a bond

Front 15

The first electron shell (nearest the nucleus of an atom) holds a maximum of

Back 15

2 Electrons

Front 16

The smallest unit of matter that retains the properties and characteristics of the element it makes up is called

Back 16

An Atom

Front 17

Which element is a component of all protein molecules, DNA and RNA?
A. potassium
B. calcium
C. sodium
D. nitrogen

Back 17

D. Nitrogen

Front 18

If sodium loses an electron, it becomes a(n)

Back 18

Cation

Front 19

The likelihood that an atom will form a chemical bond with another atom depends on

Back 19

The number and arrangement of electrons in the outermost shell

Front 20

Helium is a chemically stable gas because

Back 20

Its outermost shell is completely filled with electrons

Front 21

The most common molecule in the body that has polar covalent bonds is

Back 21

Water

Front 22

The collision energy required to break the bonds of the reactants is called its

Back 22

Activation Energy

Front 23

An increase in temperature will increase the rate of a chemical reaction because it increases the _________ of the substances involved

Back 23

Speed

Front 24

In a solution, a substance called the __________ dissolves another substance called the __________ .

Back 24

Solvent; Solute

Front 25

Water is an excellent solvent because

Back 25

It has polar covalent bonds

Front 26

Because water requires a large amount of heat to change from a liquid to a gas, it

Back 26

Provides an excellent cooling mechanism

Front 27

A polysaccharide that is found in muscle and liver cells is

Back 27

Glycogen

Front 28

Which of these substances would form an acid when dissolved in water?
A. NaCl
B. NaOH
C. KCl
D. HCl

Back 28

C. KCl

Front 29

Some molecules are said to be amphiphatic because they

Back 29

Have both polar and nonpolar regions

Front 30

One end of a phospholipid is hydrophilic because

Back 30

The head is a polar phosphate group

Front 31

The building blocks of proteins are

Back 31

Amino Acids

Front 32

All steroids contain

Back 32

Four rings of carbon atoms

Front 33

If a protein encounters a change in temperature, pH, or electrolyte concentration it will

Back 33

Unravel and lose its characteristic shape

Front 34

The portion of an enzyme where the substrates attach is called the

Back 34

Active Site

Front 35

The names of enzymes usually end with the suffix

Back 35

-ase

Front 36

The chemical called the energy currency of living systems is

Back 36

ATP

Front 37

Which of the following is the smallest in size?
A. an ion
B. an electron
C. a neutron
D. an atom

Back 37

B. an electron

Front 38

Atoms of different elements are distinguished from each other by their:

Back 38

Atomic Number

Front 39

When a peptide bond is formed, a molecule of water:

Back 39

Is Removed

Front 40

Enzymes bind only to reactant molecules called:

Back 40

Substrates

Front 41

A major function for carbohydrates is:

Back 41

As a readily available source of energy

Front 42

Which of the fatty acids is unsaturated?

Back 42

B

Front 43

Which of the beakers contain a basic solution?

Back 43

B