The electrons of an atom

occupy the space surrounding the nucleus.

The "lock and key" model describes

the way an enzyme fits perfectly with its substrate.

used in the body for insulation.

A hydrogen bond occurs between

a hydogen of one molecule and an oxygen of another.

Oil and water do not mix because

water is polar and oil is nonpolar.

Water is a polar molecule because

different parts of the molecule have different charges.

What are the four most common elements in living things?

Carbon, Hydrogen, Oxygen, and Nitrogen

a building block of larger organic molecules.

Ice floats on water because

ice has a lower density than water.

chemical that speeds up the rate of a reaction.

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Biochemistry

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Questions 25

Answers

1
The bond formed when two atoms share a pair of electrons is called a/an
hydrogen bond.
water bond.
ionic bond.
covalent bond.
2
The electrons of an atom
are found in the nucleus along with the protons.
have a positive charge.
occupy the space surrounding the nucleus.
are attached to the positive charge of neutrons.
3
Which of the following is NOT a function of proteins?
help chemical reaction in the body go faster
none of these are functions of proteins.
build structures such as muscle
insulation for the body
4
The "lock and key" model describes
the way an enzyme fits perfectly with its substrate.
the chemical bond between sodium and chlorine.
metabolism.
the properties of water.
5
Proteins are made from long chains of
carbohydrates.
amino acids.
nucleotides.
monosaccharides.
6
All matter is composed of
molecules.
cells.
atoms.
carbon.
7
My favorite class this semester is
English.
biology.
lunch.
math.
8
Lipids are
soluble in water.
made of chains of amino acids.
used in the body for insulation.
linked together by hydrogen bonds.
9
A substance that is composed of only one type of atom is called a/an
element.
molecule.
compound.
cell.
10
Which of the following type of molecule is classified as a carbohydrate?
sugars
amino acids
nucleotides
fats
11
A hydrogen bond occurs between
an oxygen of one molecule with an oxygen of another.
two hydrogens on the same molecule.
a hydrogen of one molecule and the hydrogen of another.
a hydogen of one molecule and an oxygen of another.
12
Oil and water do not mix because
they are both nonpolar.
they are both polar.
water is nonpolar and oil is polar.
water is polar and oil is nonpolar.
13
When monomers are linked to build polymers, water is released. This process is called a/an
activation energy.
surface tension.
condensation reaction.
hydrolysis.
14
Water is a polar molecule because
different parts of the molecule have different charges.
it is cold.
it contains two hydrogen atoms.
it does not have a charge.
15
Ionic bonds form between particles that have
neutral charges.
the same charges.
no charges.
opposite charges.
16
What is the optimal pH for this enzyme?
5
1
7
10
17
Chemistry is the study of
life.
biology.
the Earth.
matter.
18
What are the four most common elements in living things?
Carbon, Hydrogen, Oxygen, and Phosphorus
Carbon, Hydrogen, Oxygen, and Nitrogen
Carbon, Hydrogen, Nitrogen, and Phosphorus
Hydrogen, Nitrogen, Phorsphrus, and Sodium
19
How many bonds can/must carbon make?
1
2
3
4
20
A monomer is
a charged particle.
a polymer.
a vitamin.
a building block of larger organic molecules.
21
The two types of nucleic acids are
amino acids and DNA.
monosaccharides and DNA.
amino acids and proteins.
DNA and RNA.
22
DNA stores
genetic information.
energy.
RNA.
fat.
23
Ice floats on water because
ice has a higher density than water.
ice has a lower density than water.
it is cohesive.
it is cold.
24
An enzyme is a
chemical that speeds up the rate of a reaction.
type of carbohydrate.
type of lipid.
product of a reaction.
25
The nucleus of an atom is made up of
protons, neutrons, and electrons.
protons and electrons.
electrons and neutrons.
protons and neutrons.

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