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MIDTERM EXAM_Chem14LAB

Total questions: 55

Worksheet time: 1hrs 15mins

Name
Class
Date
1.
The organelle that acts as the control center or “brain”of the cell.
a)
Nucleus
b)
Mitochondria
c)
Endoplasmic Reticulum
d)
Ribosome
2.
The organelle that is the “powerhouse”of the cell - gives the cell it’s energy.
a)
Nucleus
b)
Mitochondria
c)
Vacuole
d)
Cell Wall
3.
The organelle that takes in sunlight and uses it for photosynthesis to give the cell energy. It is found only in plant cells.
a)
Cytoplasm
b)
Cell Wall
c)
Chloroplast
d)
Endoplasmic Reticulum
4.
The part of a cell that acts as a screen letting water & oxygen in and waste out.
a)
Cell wall
b)
Cell membrane
c)
Nucleus
d)
Vacuole
5.
The organelle that acts as a storage center for the cell.
a)
Ribosomes
b)
Mitochondria
c)
Nucleus
d)
Vacuole
6.

the more H+ ions the

a)

stronger the acid

b)

weaker the acid

c)

it neutralizes

7.
Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?
a)
strongly acidic
b)
slightly acidic
c)
strongly basic
d)
slightly basic
8.
Buffer is defined as
a)
ability to resist pH change
b)
ability to prevent pH from decreasing
c)
ability to resist a pH increase
d)
ability to resist pH change when small amount of acid added
9.
Water is ____, meaning it can be both and acid or a base
a)
Amphoteric
b)
Atmospheric
c)
Amphibious
d)
Aqueous
e)
Amplified
10.
Which end of a water molecule has a positive charge?
a)
The hydrogen side
b)
The oxygen side
c)
There is no positive charge
d)
Both sides are positive
11.
The property of water molecules sticking to other water molecules is called ______________.
a)
adhesion
b)
capillary action
c)
coagulation
d)
cohesion
12.
The property of water molecules sticking to molecules of a different substance is ____________.
a)
adhesion
b)
cohesion
c)
surface tension
d)
capillary action
13.
What is the name for a substance the gets dissolved?
a)
solvent
b)
solute
c)
fresh water
d)
sodium hydroxide
14.

Ice floats on water because:

a)

liquid water is less dense than ice

b)

water's surface tension is strong enough to support the ice

c)

there is oxygen dissolved in liquid water

d)

the molecules in ice are farther apart than the molecules in liquid water

15.

Capillary action of water in a tube is the result of _____ being stronger than _____.

a)

cohesion; adhesion

b)

adhesion; cohesion

c)

surface tension; cohesion

d)

cohesion; surface tension

16.

Which of the following is the CORRECT list of water's properties?

Read Carefully!

a)

adhesion, cohesion, high specific heat, universal solvent

b)

adhesion, cohesion, low specific heat, universal solvent

c)

adhesion, no cohesion, low specific heat, universal solute

d)

no adhesion, cohesion, high specific heat, universal solute

17.

You body sweats to help prevent you from overheating. How does water regulate temperature?

a)

it lets heat pass through it

b)

it absorbs a lot of heat, then decreases in temperature

c)

it absorbs a lot of heat, but only increases a little in temperature

d)

heat is afraid of water and avoids it

18.

A water strider can skate along the top of a pond because:

a)

covalent bonds result in water cohesion (surface tension)

b)

hydrogen bonds result in water cohesion (surface tension)

c)

water striders have adapted to take advantage of water cohesion

d)

water striders are afraid of water and avoid it

19.

Step for protein analysis

a)

Protein extraction

b)

Protein purification

c)

Protein characterization

d)

All of the above

20.
What monomer of a protein is being shown?
a)
monosaccharide
b)
glycerol and fatty acids
c)
amino acid
d)
nucleotide
21.
Choose the protein
a)
C5H12O6 
b)
C6H12O6 
c)
C3H7NO2 
d)
C26H65O3 
22.
Which indicator is used to test for the presence of proteins?
a)
Sudan IV
b)
Benedict's Reagent
c)
Biuret Reagent
d)
Iodine
23.
Linking several amino acids together produces what polymer?
a)
polysaccharide
b)
polypeptide
c)
polynucleotide
d)
triglyceride
24.
This transport protein is used to move Oxygen throughout the body (to and from red blood cells).  
a)
hemoglobin
b)
collagen
c)
insulin
d)
antibodies
25.
Which of the following is NOT a function of a protein?
a)
Storing energy for long periods of time in a small space
b)
Building structures
c)
speeding up reactions
d)
storage 
26.
This protein is used to identify disease causing organisms like bacteria when they enter the body.
a)
hemoglobin
b)
insulin
c)
keratin
d)
antibodies
27.

What is the main function of protein in the body?

a)

Is the main source of energy for the body

b)

Helps to build and repair body tissue

c)

Provide warmth and cushioning to the body's organs

d)

Helps to transport vitamins through the body

e)

All of the above are roles of protein in the body

28.
What kinds of food can you get protein from in your diet?
a)
Eggs
b)
Meat and Fish
c)
Nuts and Legumes
d)
All of the above
29.
You can get protein from plant sources.
a)
True
b)
False
30.

Excessive Protein consumption can lead to:

a)

Poor Bone Health

b)

Kidney disease and other related diseases

c)

Sleep difficulty

d)

Build more muscles

31.

Molality (m) = moles of solute / _________________________.

a)

kilogram of solvent

b)

kiloliter of solvent

c)

kilometer of solvent

d)

ounces of solvent

32.

The elements present in sodium hydroxide are

a)

sodium oxygen and hydrogen

b)

sodium , oxygen and chlorine

c)

sodium, oxygen and boron

d)

sodium, oxygen and carbon

33.

molality is defined as ________________________

a)

the moles of solute per kilogram of solvent

b)

moles of solute per liter of solution

c)

mass of solute/ mass of solution

d)

mass of solute/ mass of solvent X 100

34.
True or False? The higher the concentration of a solution the less solutes it has in it.
a)
True
b)
False
35.

A solution that is considered unsaturated would _____.

a)

be dark in color.

b)

have a strong scent.

c)

have a large amount of solute.

d)

have a small amount of solute.

36.

When a certain amount of solvent cannot hold any more solute it is called a ________ solution.

a)

supersaturated

b)

saturated

c)

unsaturated

37.

Molecules whose water solutions conduct a current.

a)

electrolytes

b)

conductive

c)

non-electrolyte

38.

When a certain amount of solvent has been heated and more solute is dissolved than the solvent can normally hold it is called a ________ solution.

a)

saturated

b)

supersaturated

c)

unsaturated

39.
The reaction used to digest and break the bond in red is:
a)
Hydrolysis
b)
Dehydration Synthesis
c)
Oxidation
d)
Single Displacement
40.

This property of amino acids refers to their ability to act as an acid or a base.

a)

zwitterionic

b)

chirality

c)

UV absorptive

d)

amphoteric

41.

The C-terminal amino acid in the depicted tripeptide is _____.

a)

leucine,

b)

isoleucine

c)

alanine

d)

tyrosine

42.

This color is produced upon the reaction of ninhydrin solution with the amino acids in paper chromatography.

a)

Methy red

b)

Bromocresol green

c)

Ruhemann purple

d)

Crystal violet

43.

All are α-amino acids, except:

a)

asparagine

b)

threonine

c)

arginine

d)

proline

44.

Amino acids shown above are

a)

dibasic-monocarboxylic

b)

aromatic

c)

imino acids

d)

alkyl group containing

45.

The general components of an amino acid are

a)

amino group

b)

carboxylic acid group

c)

alpha carbon

d)

R group side chain

e)

all of the above

46.

Why does an amino acid yield a negative biuret test result?

a)

it depends on the side group

b)

because there are no peptide bonds present

c)

because it's not a reducing sugar

d)

because it is a charged compound

47.

Select the amino acid group which contains "Aromatic" side chain

a)

Methionine & Pheylalanine

b)

Tryptophan & Glutamate

c)

Pheylalanine & Tryptophan

d)

Lysine & Hisidine

48.

What does an enzyme do?

a)

slows down chemical reactions

b)

speeds up chemical reactions

c)

increases the temperature of the reaction

49.

Plants and animal cells have...

a)

Mitochondria and chloroplasts

b)

Nucleus and chloroplast

c)

Cell wall and chloroplast

d)

Mitchochodria and cytoplasm

50.

The outermost layer of a plant cell and animal cell is...

a)

Plant cell - cell membrane, animal cell - cell wall

b)

Plant cell - cell wall; animal cell - cell membrane

c)

Plant and animal cell - cell wall

d)

Plant and animal cell - cell membrane

51.
How many grams of AgNO3 (MM = 169.87) are needed to prepare 0.125M solution in 250 mL of water? 
a)
.03g
b)
0.5g
c)
5.3g
d)
84.9g
52.
Calculate the molarity of the following solution:  1.0 mole of KCl in 750.0 mL of solution.
a)
0.750 M
b)
99 M
c)
1.3 M
d)
2.0 M
53.
How many moles are needed to make 2.5 L of a 3.8 M solution? 
a)
9.5 mol
b)
0.66 mol
c)
1.5 mol
d)
15 mol
54.
What is the molarity of 4 g of NaCl (MM=58.45) in 3,800 mL of solution?
a)
0.018 M
b)
0.0011 M
c)
1.052 M
d)
0.062 M
55.
How many moles of NaCl are present in a solution with a molarity of 8.59 M and a volume of 125 mL?
a)
1074 mol
b)
0.069 mol
c)
1.07 mol
d)
62.7 mol

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