1 of 20
The subatomic particles that play the greatest role in cellular chemical reactions are
2 of 20
The structural unit that retains the properties of an element is the
3 of 20
Which of the following are found in the nucleus of an atom?
A and B
4 of 20
The component of an atom or molecule that is most important in determining its chemical properties is the
5 of 20
What is the maximum number of electrons the innermost shell can hold?
6 of 20
An atom becomes an ion when
it gains or loses electrons.
it gains or loses protons.
it shares hydrogen atoms.
it gains or loses neutrons.
7 of 20
The symbol 3CO2 represents
one atom of oxygen and three atoms of carbon.
three atoms of carbon and one molecule of oxygen.
three molecules of carbon dioxide.
one atom of carbon and three atoms of oxygen.
8 of 20
In water, hydrogen bonding occurs between the hydrogen and
an oxygen atom in the same molecule.
an oxygen atom in a different molecule.
a hydrogen atom in a different molecule.
a hydrogen atom in the same molecule.
9 of 20
Covalent bonds form when one atom _________ its _________ with another atom.
gives up; electrons
gives up; neutrons
10 of 20
Water is an important solvent of life because
it forms covalent bonds.
it has cohesive properties.
it forms hydrogen bonds.
it is ionic.
11 of 20
Carbon is such an important molecule for life because
it can form chemical bonds with a maximum of four other atoms. it can hydrogen bond to so many other molecules.
it forms ionic bonds.
it can form isomers.
12 of 20
Pure water has a pH of ________ because it is_________.
0; neither acidic nor basic
7; neither acidic nor basic
13 of 20
Hydrolysis could be correctly described as
heating a compound to drive off excess water and concentrate its volume. breaking of a long-chain compound into its subunits by adding water to the structure between its subunits. constant removal of hydrogen atoms from a carbohydrate.
None of the above.
14 of 20
Carbohydrate monomers are united into a polymer by means of
15 of 20
Polysaccharides are made up of
16 of 20
Butter is made of milkfat and tends to be hard at room temperature. Which of the following could be used to make the butter softer at room temperature?
Create more double bonds in the fatty acid chains
Make fatty acid chains with fewer kinks
Saturate the fatty acid chains
Make the fatty acid chains longer
17 of 20
Proteins are made up of
18 of 20
An organic molecule that may contain the –NH2 group is
a glucose molecule.
19 of 20
DNA is made up of:
20 of 20
Which of the following describes a special type of protein that causes metabolic reactions to proceed at a much greater rate than they normally would?
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