WorksheetsUnit 02 - Chemistry of Life
Total questions: 21
Worksheet time: 10mins
Which of the following is NOT one of the six elements that make up 96% of matter?
Na
H
O
N
An atom of carbon with 6 neutrons and 7 protons is considered an (a) .
What quality leads atoms to interact and form polar covalent bonds?
Equal electronegativities
High electronegativities
Unequal electronegativities
Low electronegativities
When two atoms are equally electronegative, they will interact to form:
non-polar covalent bonds
ionic bonds
polar covalent bonds
hydrogen bonds
In a single molecule of water, what bond attracts the hydrogen atoms to the oxygen?
hydrogen bond
polar covalent bond
non-polar covalent bond
ionic bond
What force attracts water molecules to other water molecules?
Ionic bond
polar covalent bond
non-polar covalent bond
hydrogen bond
Which property of water allows this bug to walk on water?
solid water is less dense
adhesion
cohesion
water's high specific heat
Why does solid water float in liquid water?
air bubbles make it less dense
water molecules in ice are spread further apart
covalent bonds of ice make each atom more spread
solid water is more dense than liquid water
Which atom(s) of a water molecule is/are negatively charged
both hydrogens
the oxygen
one hydrogen
none
Olive oil repels water molecules because:
they are hydrophilic and non-polar
They are hydrophobic and non-polar
they are hydrophobic and polar
they are hydrophilic and polar
What functional group is this?
Carboxyl
Hydroxyl
Carbonyl
Amino
What functional group is this?
Carboxyl
Carbonyl
Methyl
Hydroxyl
What functional group is this?
carbonyl
hydroxyl
phosphate
methyl
Which is true of a dehydration reaction?
it occurs after hydrolysis
it requires the addition of water
it is a reaction that breaks down polymers into monomers
it is a reaction that combines monomers into polymers
Which is true of a hydrolysis reaction?
It is a reaction that breaks down polymers into monomers
it requires the removal of water
it occurs only after dehydration reactions
it is a reaction that combines monomores into polymers
What type of molecule is this?
monosaccharide
disaccharide
monomer
Where would you expect to find cellulose?
cell walls of fungi
cell walls of bacteria
cell walls of plants
cell walls of arthropods
Which of the following is NOT found in a nucleotide?
nitrogenous base
phosphate group
sulfhydryl group
pentose sugar
A DNA sample was found to be composed of 20% adenine. What is the percentage of cytosine?
20%
30%
80%
0%
In what direction is DNA "read"?
3' to 5'
5' to 3'
Which base is paired with uracil in RNA?
Adenine
Thymine
Cytosine
Guanine
