Biology (Raven), 10th Edition

Chapter 3: The Chemical Building Blocks of Life

Pre-Test

1
Why does carbon form four covalent bonds?
A)Because carbon has a high electronegativity.
B)Because carbon needs four electrons to fill its outer shell.
C)Because the most common isotope has four neutrons.
D)Because carbon tends to give up four electrons to balance the charge of its protons.
E)Because carbon has a low electronegativity.
2
The bonds in methane (CH4) are ________ bonds.
A)nonpolar covalent
B)polar covalent
C)hydrogen
D)ionic
E)disulfide
3
Olive oil is a liquid at room temperature and is therefore expected to have a high proportion of _____________ fatty acids.
A)highly branched
B)saturated
C)steroidal
D)unsaturated
E)small-chain
4
What feature of phospholipids makes them polar?
A)One end is hydrophilic and one end is hydrophobic.
B)They have several interconnected rings.
C)One fatty acid can be saturated while the other can be unsaturated.
D)They can exist in "right handed" and "left handed" versions.
E)Carbon is much more electronegative than hydrogen.
5
Proteins are made up of
A)fatty acids.
B)stearic acid.
C)amino acids.
D)monosaccharides.
E)nucleic acids.
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