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Unit 2 review Chemistry of Life & Macromolecules

Total questions: 72

Worksheet time: 47mins

Name
Class
Date
1.

Carbon is unique because it bonds

a)

1 time readily with carbon

b)

2 times readily with carbon

c)

3 times readily with carbon

d)

4 times readily with carbon

2.

Within a water molecule, what bond is between the hydrogen and oxygen

a)

Covalent bond

b)

Ionic bond

c)

Hydrogen bond

d)

Peptide bond

3.

Water's special properties of cohesion, adhesion, high specific heat, and ability to act as a near universal solvent are ALL due to

a)

covalent bonds between hydrogen and oxygen

b)

ionic bonds between oxygen and hydrogen

c)

hydrogen bonds between water molecules

d)

its polarity, uneven distribution of charges within the water molecule itself

4.

What three elements are often in organic molecules?

a)

Nitrogen, carbon, hydrogen

b)

Oxygen, carbon, hydrogen

c)

Neon carbon hydrogen

d)

Oxygen, hydrogen, nitrogen

5.

Which element is in all organic compounds?

a)

Hydrogen

b)

Carbon

c)

Nitrogen

d)

Oxygen

6.

This macromolecule above is

a)

Lipid

b)

Carbohydrate

c)

Protein

d)

Nucleic acid

7.

The function of this macromolecule is long term storage

a)

Carbohydrate

b)

Protein

c)

Nucleic acid

d)

Lipids

8.

This function of this macromolecule is storing our genetic material

a)

Lipid

b)

Carbohydrate

c)

Nucleic acid

d)

Protein

9.

An enzyme

a)

Is A lipid

b)

Is A biological catalyst

c)

Able to heat up molecules

d)

Slows down chemical reactions

10.

Starch, glycogen, polysaccharides and cellulose are all

a)

Carbohydrates

b)

Lipids

c)

Nucleic acids

d)

Proteins

11.

This macromolecule is structurally straight and is a

a)

Protein

b)

Lipid

c)

Carbohydrate

d)

Nucleic acid

12.

What is the optimal pH for Trypsin?

a)

2.5

b)

8

c)

12

d)

14

13.

What is the optimal pH for Pepsin?

a)

2.5

b)

6.5

c)

12

d)

14

14.

Which body part would pepsin work the best in?

a)

mouth

b)

stomach

c)

small intestine

d)

large intestine

15.

Pepsin and Trypsin are both

a)

sugars

b)

carbohydrates

c)

lipids

d)

proteins

16.

What bonds holds together the nitrogenous bases in DNA

a)

Covalent

b)

Ionic

c)

Hydrogen

d)

Peptide

17.

What are the monomers of proteins

a)

Fatty acids

b)

Monosaccharides

c)

Nucleotides

d)

Amino acids

18.

True or false: enzymes are substrate specific

a)

True

b)

False

19.

Enzymes lower which activation energy

a)

The products

b)

The intermediate

c)

The reactants

d)

All of them

20.

What happens to an enzyme when it goes out of it’s optimal conditions

a)

Increases

b)

decreases/denatures

c)

Speeds up reactions more

21.

Lipids are good energy storage molecules because

a)

They cannot be broken by enzymes

b)

The have many carbon-hydrogen bonds (usually in long structural lines)

c)

The can absorb heat

22.

After a chemical reaction, the enzyme

a)

Denatures

b)

Restores to its original state

c)

Dissolves

d)

Converts to something else

23.

Which carbohydrate is stored in the liver cells of humans

a)

Starch

b)

Glycogen

c)

Cellulose

d)

glucose/sugar

24.

What type of macromolecule is this?

a)

lipid

b)

carbohydrate

c)

protein

d)

nucleic acid

25.

Select all that apply: Which statements about water are true?

a)

water molecules can form hydrogen bonds with other polar substances

b)

water molecules can form temporary bonds between themselves

c)

water can form ionic bonds with other polar molecules

d)

a water molecule has an oxygen atom covalently bonded to 2 hydrogen atoms

26.

A cell contains

a)

thousands of different kinds of enzymes, each promoting a different chemical reaction.

b)

one kind of enzyme that promotes thousands of different chemical reactions.

c)

approximately 100 kinds of enzymes, each promoting a different chemical reaction.

d)

one enzyme that promotes photosynthesis and one enzyme that promotes cellular respiration.

27.

True or False: Animals store energy in the form of glycogen.

a)

True

b)

False

28.

Select all that apply: Which of the following are organic macromolecule?

a)

carbohydrate

b)

ice

c)

lipid

d)

nucleic acid

29.

True or False: Nucleotides are monomers of nucleic acids (DNA and RNA).

a)

True

b)

False

30.

Check all the answers that apply. The outermost energy level is important for:

a)

Forming bonds

b)

Movement

c)

Structure

d)

Forming Ions

31.

A positive ion:

a)

Losses an electron.

b)

Gains an electron.

c)

Donates an electron.

d)

Receives an electron.

32.

A negative ion:

a)

Losses an electron.

b)

Gains an electron.

c)

Donates an electron.

d)

Receives an ion.

33.

What is a molecule?

a)

A group of electrons.

b)

A group of elements.

c)

A group of atoms held together by covalent bonds.

d)

Two or more elements held together by chemical bonding.

34.

Chose all that apply. What are some unique properties of water?

a)

It can freeze and boil.

b)

High specific heat.

c)

Cohesion.

d)

Adhesion.

35.

What is a catalyst? Chose the best answer that applies.

a)

Decreases activation rate and increases the reaction rate.

b)

Helps get a reaction started.

c)

A cat with a lisp.

d)

A list of cats.

36.
The attraction that causes water and other liquids to form drops on thin films is called ________________. This is also water’s ability to be attraction to other water molecules.
a)
adhesion
b)
capillary action
c)
cohesion
d)
surface tension
37.
What is the basic unit of matter?
a)
compound 
b)
atom
c)
molecule
d)
macromolecule 
38.
What is a pure substance made of only one type of atom?
a)
Element
b)
Isotope
c)
Compound
d)
Molecule
39.
Which is the strongest acid?
a)
pH 14
b)
pH 2
c)
pH 7
d)
pH 0
40.
Which is considered neutral?
a)
pH of 4
b)
pH of 9
c)
pH of 14
d)
pH of 7
41.

What causes surface tension? Remember surface tension is holding water together.

a)

adhesion

b)

high specific heat

c)

low specific heat

d)

cohesion

42.

What subatomic particle is negatively charged?

a)

electrons

b)

protons

c)

neutrons

d)

solution

43.
The energy needed to get a reaction started is the 
a)
adhesion energy
b)
activation energy
c)
cohesion energy
d)
chemical energy
44.

The positively charged particle in an atom is called the

a)

neutron

b)

ion

c)

proton

d)

electron

45.

When is an ionic bond formed?

a)

when electrons are shared

b)

when protons are shared

c)

when oppositely charged atoms gain or lose electrons

d)

when oppositely charged atoms gain or lose a proton

46.

What gives water so many important properties for life?

a)

adhesion and cohesion

b)

the amount of carbon in each molecule

c)

energy released exothermically

d)

hydrogen bonds give it polarity

47.

What makes a chemical reaction?

a)

matter is conserved

b)

breaking and forming of chemical bonds

c)

when products form reactants

d)

when you do a lab

48.

Which of the following solutions has the highest Hydrogen ion concentration?

a)

a solution with a pH of 1

b)

a solution with a pH of 4

c)

a solution with a pH of 7

d)

a solution with a pH of 10

49.

A catalyzed reaction

a)

increases the products made

b)

uses less activation energy to get started

c)

has a slower reaction rate

d)

uses more reactants throughout the reaction

50.

Atoms that share electrons are

a)

in a covalent bond

b)

in an ionic bond

c)

are usually salts

d)

always metals

51.

What are the reactants in this chemical equation?

a)

CH4 and 2O2

b)

carbon and oxygen

c)

CO2 and 2 H2O

d)

water and methane

52.

Which number shows the atomic number?

a)

2

b)

4.0026

c)

4

d)

HE

53.

An element will always have the same number of

a)

electrons

b)

neutrons

c)

protons

d)

Orbitals

54.

Atomic Mass of an atom is the?

a)

amount of neutrons plus electrons

b)

amount of protons plus neutrons

c)

amount of electrons plus protons

d)

amount of protons only

55.
What is the atomic number?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
56.
What is the mass number defined as?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
57.
What is the atomic number of this atom?
a)
1
b)
3
c)
4
d)
7
58.

What is the mass number of this atom?

a)

1

b)

3

c)

4

d)

7

59.

The fluorine atom has an atomic number of

a)

19

b)

9

60.
How many protons does He have?
a)
4
b)
2
c)
6
d)
0
61.
The top number in this isotope notation is
a)
the mass number
b)
the atomic number
c)
the atomic mass
d)
the neutron number
62.
Different isotopes have...
a)
different masses
b)
different atomic numbers
c)
different electrons
d)
different protons
63.

What is the atomic mass of the pictured isotope?

a)

2

b)

4

c)

6

d)

The correct answer isn't one of the choices.

64.
Which of the following is the proper equation for determining the number of neutrons for a given isotope?
a)
mass # - atomic #
b)
atomic mass - protons
c)
protons + electrons
d)
mass # + protons
65.
According to the isotopic notation for copper-63, how many neutrons are present in this type of atom?
a)
29
b)
34
c)
63
d)
92
66.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
d)
70
67.
which atom has  4 neutrons?
a)
Li-6
b)
Li-7
c)
Li-8
d)
they have the same # of neutrons
68.

WHAT IS THE CHARGE OF THIS ION

a)

3+

b)

4+

c)

5+

d)

6+

69.

IF NUMBER OF PROTONS IS 31, WHAT IS THE NUMBER OF ELECTRONS

a)

27

b)

28

c)

29

d)

30

70.

WHAT IS THE NUMBER OF ELECTRONS

a)

32

b)

16

c)

48

d)

18

71.

WHAT IS THE MASS NUMBER IF NUMBER OF NEUTRONS IS 30

a)

5

b)

25

c)

50

d)

55

72.

WHAT IS THE NUMBER OF ELECTRONS

a)

25

b)

24

c)

23

d)

22

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