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WorksheetsBiochemistry
Total questions: 36
Worksheet time: 18mins
An atom that contains 10 protons and 10 electrons has:
a positive charge
a negative charge
no charge (neutral)
isn't an atom, but is a charged ion
Which of the following is a compound?
H2
P
He
H2O
To determine the mass of an atom you add:
electrons only
protons and electrons
protons and neutrons
protons, neutrons, and electrons
The helix (twisted ladder) is the shape of which macromolecule?
proteins
lipids
carbohydrates
nucleic acids
Our protective cell membranes are made out of which macromolecule?
(Hint: they don't dissolve in water)
carboyhdrates
lipids
proteins
nucleic acids
Water is the universal solvent, which means it dissolves most substances.
It has this property because it is a ________ molecule with an unequal charge.
polar
nonpolar
What macromolecule serves as our main energy source?
proteins
lipids
nucleic acids
carbohydrates
Cohesion, which holds multiple water molecules together through an electrostatic attraction, is caused by which type of bond?
oxygen
hydrogen
metallic
nuclear
How do enzymes affect the rate of chemical reactions?
they don't change anything
they slow them down, to make them more accurate
they speed them up by lowering the activation energy needed
Enzymes can lose their shape and function (denature) if ____levels aren't correct.
pH
temperature
they can work under any conditions
both pH & temperature
All macromolecules include which element?
phosphorus (P)
Nitrogen (N)
Helium (He)
Carbon (C)
Our blood and stomach acid pH levels are kept stable by ____.
acids
buffers
bases
neutrals
When hydrogen ions (H+) and hydroxide ions (OH-) are equal in a solution, the pH is considered neutral. What numbers represents neutral on the pH scale?
0
1
7
14
Sugars and starches, like candy & pasta, contain mostly _____.
proteins
nucleic acids
carbohydrates
lipids
Triglycerides & oils are examples of _____.
carbohydrates
lipids
proteins
nucleic acids
Enzymes and antibodies are both types of _____.
carbohydrates
lipids
nucleic acids
proteins
Macromolecules that store "long-term" energy:
lipids
carbohydrates
proteins
nucleic acids
Nucleotides are the monomer (building block) of:
proteins
lipids
nucleic acids
carbohydrates
Amino acids link together to form polypeptides, which become:
proteins
nucleic acids
carbohydrates
lipids
This diagram shows:
carbohydrates
lipids
nucleic acids
proteins
Our genetic information is stored in:
proteins
lipids
nucleic acids
carbohydrates
The basic unit of all matter (living & non-living) in the universe:
molecules
protons
atoms
nucleus
Our muscle, skin, and hair are built by ______.
proteins
carbohydrates
lipids
nucleic acids
What macromolecule typically has a hexagon shape?
protein
carbohydrate
lipid
nucleic acid
What is this?
nucleotide
glucose
amino acid
fatty acid
Lemons have a pH around 3. This means they are:
alkaline
basic
acidic
neutral
Which of the follwing molecules is needed by all living things?
carbohydrates
lipids
nucleic acids
proteins
all of these
Phosphorus has ____ protons?
15
30
31
It depends on if it's an ion or not.
Phosphorus has ___ neutrons.
15
16
30
31
A neutral atom of phosphorus has ___ electrons.
15
16
30
31
Valence ____ have a negative charge and are responsible for chemical bonding.
protons
neutrons
electrons
nucleus
DNA and RNA are examples of ____.
nucleic acids
proteins
lipids
carbohydrates
Polymers of this macromolecule include cellulose and starches.
proteins
lipids
carbohydrates
nucleic acids
The carbohydrate monomer that plants produce during photosynthesis:
amino acids
nucleotides
glycerol
glucose
Atoms can give, take, or share valence electrons to become stable molecules?
True
False
The location where a substrate attaches to an enzyme (2 in the diagram) is called:
a substrate
a buffer
an active site
a reactant
