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WorksheetsBioChem Review
Total questions: 56
Worksheet time: 49mins
Name
Class
Date
1.
Protein molecules are composed of long chains of __________________
a)
DNA
b)
amino acids
c)
RNA
d)
ribosomes
2.
Which of the following are nucleic acids?
a)
Saturated and unsaturated fats
b)
DNA and RNA
c)
collagen and keratin
d)
glucose and starch
3.
Which of the following foods contain mostly lipids?
a)
fruit
b)
butter
c)
chicken
d)
carrots
4.
Nucleic acids, proteins, and other large biological molecules are known as polymers because...
a)
they are the base units used in the formation of plastics
b)
they all function as enzymes
c)
they contain only ionic bonds
d)
they contain many small, repeating subunits bonded together
5.
Many land plants store energy in carbohydrates. When energy is needed, the carbohydrate molecules can be broken down quickly. This chemical reaction produces which of the following monomers?
a)
Amino Acids
b)
Lipids
c)
Monosaccharides
d)
RNA chains
6.
Meats, eggs & cheeses are examples of which macromolecules
a)
monomer
b)
nucleic acids
c)
proteins
d)
carbohydrates
7.
Sugars such as ribose, fructose and glucose are examples of ______________?
a)
proteins
b)
lipids
c)
nucleic acids
d)
carbohydrates
8.
The smallest basic unit of matter is the
a)
molecule.
b)
atom.
c)
compound.
d)
cell.
9.
Which macromolecule stores long-term energy?
a)
Proteins
b)
Lipids
c)
Nucleic Acids
d)
Carbohydrates
10.
Which macromolecule contains genetic information?
a)
Proteins
b)
Carbohydrates
c)
Nucleic Acids
d)
Lipids
11.
Which of the following is formed when an atom gains or loses electrons?
a)
element
b)
compound
c)
molecule
d)
ion
12.
Atoms in molecules share pairs of electrons when they make
a)
covalent bonds.
b)
ionic bonds.
c)
hydrogen bonds.
d)
polymers.
13.
What gives water many properties that are important to living things?
a)
temperature
b)
hydrogen bonds
c)
density
d)
specific heat
14.
Which of the following solutions has the highest H 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
15.
Which substance represented in Figure 2.1 (A or B) is the solvent?
a)
both A and B
b)
substance A
c)
substance B
d)
neither A nor B
16.
What is a substance called if it speeds up a chemical reaction?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
17.
How do enzymes speed up chemical reaction?
a)
Increasing activation energy
b)
Decreasing activation energy
c)
Increasing deactivation energy
d)
Decreasing deactivation energy
18.
Each enzyme only has 1 substrate that will fit its active site. What is this called?
a)
reusablility
b)
denaturation
c)
specificity
d)
fragility
19.
With what 3 letters do enzymes typically end?
a)
-ose
b)
-ase
c)
-ese
d)
-tic
20.
The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?
a)
Enzymes increase the energy of the reactants.
b)
Enzymes decrease the energy level of the products.
c)
Enzyme decrease the activation energy of the reaction.
d)
Enzymes reverse the direction of the reaction.
21.
Which of the following conclusions can be drawn from this graph?
a)
The optimum pH of the enzyme is 6.6.
b)
The optimum pH of the enzyme is 5.8
c)
The enzyme’s activity increases as pH increases 5.0 to 9.0
d)
The enzyme’s activity is greater around pH of 8.0 .
22.
Any substance that is acted upon by an enzyme is called a(n)?
a)
Coenzyme
b)
Substrate
c)
Vitamin
d)
Polypeptide
23.
Based on the graph, what is the optimal temperature for this enzyme?
a)
15oC
b)
40oC
c)
30oC
d)
35oC
24.
In the diagram, what is letter A?
a)
product
b)
substrate
c)
enzyme-substrate complex
d)
active site
25.
Enzymes are...
a)
nucleic acids
b)
proteins
c)
lipids
d)
carbohydrates
26.
An enzyme speeds up a chemical reaction in the cell but can only be used once. True or False?
a)
true
b)
false
27.
What happens when enzymes are heated to a high temperature?
a)
The enzymes die.
b)
The shapes of the enzyme are altered or denatured
c)
The enzymes' amino acid sequence changes.
d)
The enzymes remain the same
28.
Which of these is most likely an enzyme?
a)
Sucrose
b)
Galactose
c)
Fructose
d)
Amylase
29.
Letter D...
a)
active site
b)
enzyme
c)
substrate
d)
products
30.
Letter B...
a)
active site
b)
enzyme
c)
substrate
d)
products
31.
Letter C...
a)
active site
b)
enzymes
c)
substrate
d)
products
32.
Letter E...
a)
active site
b)
enzyme
c)
substrate
d)
products
33.
The positive particles of an atom are
a)
electrons
b)
positrons
c)
neutrons
d)
protons
34.
Particles in an atom that are neutral and have no charge are
a)
negatrons
b)
electrons
c)
neutrons
d)
protons
35.
True or False? Neutrons have a negative charge
a)
True
b)
False
36.
What is the atomic number for an element with three protons?
a)
2
b)
1
c)
3
d)
6
37.
A particle that moves around the nucleus is a(n)...
a)
Proton
b)
Neutron
c)
Electron
d)
Quark
38.
The symbol for Carbon is
a)
6
b)
12.011
c)
C
d)
Ca
39.
Beryllium has how many protons?
a)
4
b)
9.0122
c)
2
d)
13.0122
40.
What is the smallest?
a)
worm
b)
molecule
c)
galaxy
d)
atom
41.
What are the 3 subatomic particles that make-up the atom?
a)
protons, neutrons, and isotopes
b)
neutrons, isotopes, and electrons
c)
positives, negatives, and electrons
d)
protons, neutrons, and electrons
42.
Which of the following properties of water enables it to move from the roots to the leaves of plants?
a)
Water expands as it freezes.
b)
Water is an excellent solvent.
c)
Water exhibits cohesive behavior.
d)
Water moderates temperature.
43.
What property of water allows it to be such a versatile solvent that it is often called the "universal solvent?"
a)
Purity
b)
Polarity and cohesion
c)
High heat capacity
d)
Expansion upon freezing
44.
Large bodies of water do not quickly fluctuate in temperature. Why?
a)
Water is a solvent.
b)
Water has a high heat capacity.
c)
Water acts as a buffer.
d)
Water is non-polar.
45.
What two elements make up water?
a)
Helium and oxygen
b)
Hydrogen and oxygen
c)
helium and carbon
d)
oxygen and carbon
46.
What word describes when water is attracted to other substances?
a)
cohesion
b)
adhesion
c)
capillary action
d)
surface tension
47.
Why can water have no net charge but have slight charges in different parts of the molecule?
a)
The oxygen end is slightly negative and the hydrogen end is slightly positive
b)
The hydrogen end is slightly negative and the oxygen end is slightly positive
c)
The hydrogen and oxygen ends change in polarity
d)
Because it is hydrophobic
48.
Attractions between water molecules are called
a)
Covalent bonds
b)
Ionic bonds
c)
Polar bonds
d)
Hydrogen bonds
49.
Which is NOT a unique property of water?
a)
Frozen water floats on liquid water.
b)
Water covers most of the Earth’s surface and retains a large amount of heat.
c)
Water molecules stick to each other through hydrogen bonds.
d)
Water cools very rapidly.
50.
Why does ice float?
a)
As water freezes, it expands and its density decreases.
b)
As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
c)
As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
d)
As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.
51.
What type of reaction occurs in a hand warmer?
a)
exothermic
b)
endothermic
52.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
53.
In an endothermic reaction, heat is...
a)
taken in
b)
given out
54.
During an endothermic reaction in a beaker, if we touched the beaker it would feel _______.
a)
Warm
b)
Cold
55.
According to this graph the reaction is..
a)
Endothermic
b)
Exothermic
56.
According to this graph the reaction is
a)
Endothermic
b)
Exothermic
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