Focus On Physical Science: California Grade 8

Chapter 10: Chemistry of Living Systems

Standards Review

1.
Which is the best description of an unsaturated fat? 6.a
A)It has at least one double bond between carbon atoms
B)It has only single bonds between carbon atoms
C)It contains no water
D)It is a solid at room temperatures.
2.
One use of water in plants and animals is _______. 6.c
A)to form organic compounds
B)to convert carbon dioxide to water vapor
C)to convert hydrocarbons to polar molecules
D)to transport nutrients to cells
3.
The six most abundant elements in living organisms include carbon, oxygen, nitrogen, and hydrogen, as well as _______. 6.b
A)sodium and chlorine
B)sodium and magnesium
C)phosphorus and sulfur
D)sodium and calcium
4.
Which molecule has a tetrahedral shape? 6.a
A)cyclopentane
B)methane
C)ethylene
D)carbon dioxide
5.
Which is the most abundant element in the human body? 6.b
A)oxygen
B)nitrogen
C)carbon
D)hydrogen
6.
Carbon does not form which of these types of bonds? 6.a
A)covalent triple
B)covalent single
C)covalent double
D)ionic
7.
A saturated hydrocarbon contains only _______ between the carbon atoms. 6.a
A)single and double covalent bonds
B)single ionic bonds
C)single covalent bonds
D)triple covalent bonds
8.
Which type of compound is not a monomer? 3.c
A)sugars
B)hydrocarbons
C)amino acids
D)nucleotides
9.
A single DNA molecule can contain _______ of atoms 6.c
A)millions
B)thousands
C)hundreds
D)billions
10.
Carbohydrates contain only _______ atoms. 6.b
A)carbon, nitrogen, and phosphorus
B)carbon and hydrogen
C)carbon and oxygen
D)carbon, hydrogen, and oxygen
11.
Carbon atoms can form an enormous number of different compounds because _______. 6.a
A)carbon atoms are larger than most atoms
B)carbon is the most abundant element on Earth's surface
C)carbon atoms can form covalent bonds with other carbon atoms and other types of atoms in many ways
D)carbon atoms can form ionic and covalent bonds with other atoms
12.
All living organisms need which compound in order to live? 6.c
A)methane
B)water
C)isopropyl alcohol
D)lactic acid
13.
Which is a property of a lipid? 6.c
A)insoluble in water
B)made from amino acids
C)stores genetic information in a cell
D)contain carboxyl groups
14.
Which is not a complex carbohydrate? 6.c
A)starch
B)cellulose
C)glycogen
D)nucleic acid
15.
Many of water's unique properties are because it is a _______. 6.c
A)ionic molecule
B)nonpolar molecule
C)linear molecule
D)polar molecule
Grade 8
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