PCB 3023 CH 2 SMARTWORK EXAM
QUESTIONS AND ANSWERS GRADED A+
2026
Which statement is true of hydrophilic molecules?
Choose one:
A. They are typically hydrocarbons.
B. They are generally uncharged.
C. They mix well with water.
D. They form few or no hydrogen bonds. - ANS They mix well with water.
What distinguishes the chemistry of life from other types of chemistry?
Choose one or more:
A. It takes place almost exclusively in water.
B. It is dominated by collections of polymers.
C. It is based overwhelmingly on potassium-containing compounds. - ANS It takes place
almost exclusively in water.
It is dominated by collections of polymers.
What chemical group is found in a nucleotide but not in a nucleoside?
Choose one:
A. nitrogen-containing base
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1
, B. hydroxyl group
C. pentose
D. phosphate
E. sugar - ANS Phosphate
What is the covalent linkage between two adjacent amino acids in a protein called?
Choose one:
A. peptide bond
B. phosphodiester bond
C. glycosidic bond
D. phosphoanhydride bond
E. hydrogen bond - ANS Peptide bond
Which chemical group is found on all amino acids?
Choose one:
A. thiol group
B. phosphate group
C. methyl group
D. aromatic ring
E. carboxylic acid group - ANS Carboxylic acid group
Amino acids are subunits of which of the following macromolecules?
Choose one:
A. RNA
B. both RNA and DNA
C. polysaccharides
D. DNA
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2
QUESTIONS AND ANSWERS GRADED A+
2026
Which statement is true of hydrophilic molecules?
Choose one:
A. They are typically hydrocarbons.
B. They are generally uncharged.
C. They mix well with water.
D. They form few or no hydrogen bonds. - ANS They mix well with water.
What distinguishes the chemistry of life from other types of chemistry?
Choose one or more:
A. It takes place almost exclusively in water.
B. It is dominated by collections of polymers.
C. It is based overwhelmingly on potassium-containing compounds. - ANS It takes place
almost exclusively in water.
It is dominated by collections of polymers.
What chemical group is found in a nucleotide but not in a nucleoside?
Choose one:
A. nitrogen-containing base
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
1
, B. hydroxyl group
C. pentose
D. phosphate
E. sugar - ANS Phosphate
What is the covalent linkage between two adjacent amino acids in a protein called?
Choose one:
A. peptide bond
B. phosphodiester bond
C. glycosidic bond
D. phosphoanhydride bond
E. hydrogen bond - ANS Peptide bond
Which chemical group is found on all amino acids?
Choose one:
A. thiol group
B. phosphate group
C. methyl group
D. aromatic ring
E. carboxylic acid group - ANS Carboxylic acid group
Amino acids are subunits of which of the following macromolecules?
Choose one:
A. RNA
B. both RNA and DNA
C. polysaccharides
D. DNA
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
2
