Which of the following biological molecules
contain peptide bonds?
a.
b.
c.
d.
Proteins
Carbohydrates
Lipids
Nucleic Acids
A
C
Which one is…
1.a lipid
2.a nucleotide
3.an amino acid
4.a carbohydrate
B
B
D
What is the function of chaperonin proteins?
a.
b.
c.
d.
e.
Denaturation of polypeptides
Assembling amino acids
Regulation of gene expression
Folding proteins
None of the above
Which amino acid is responsible for the
formation of disulfide bonds?
a.
b.
c.
d.
e.
Alanine
Proline
Tyrosine
Cysteine
Isoleucine
Which amino acid would be considered basic?
a.
b.
c.
d.
e.
Alanine
Lysine
Tyrosine
Cysteine
Isoleucine
Which amino acid would be considered acidic?
a.
b.
c.
d.
e.
Alanine
Lysine
Tyrosine
Glutamate
Isoleucine
The addition of water to break a chemical bond
is termed –
a.
b.
c.
d.
e.
Dehydration synthesis
Hydrolysis
Condensation
Catabolism
Disassociation
Which of the following is not a function of
proteins?
a.
b.
c.
d.
e.
Coding for polypeptides
Catalyzes chemical reactions
Transport of material
Structural components of tissues
All of the above are protein functions
Each strand of DNA contains nucleotides that
are covalently bonded together through
polymerization. These connecting bonds are
called phosphodiester bonds.
a. This is true
b. This is false
The energy in carbohydrates is stored in the C-H
bonds.
a. This is true
b. This is false
If a chromosome contains 20% thymine, how
much guanine should it have?
a.
b.
c.
d.
10%
20%
30%
40%
Which of the following is an amino group?
a.
b.
c.
d.
e.
-OH
-C=O
-COOH
-SH
-NH2
Dehydration synthesis –
a.
b.
c.
d.
e.
Is used to link monomers
Removes water to form bonds
Is involved in protein synthesis
Can form disaccharides
All of the above
Lincosamides are a class of antibiotics that
inhibit peptide bond formation. What type of
biological molecule would be affected?
a.
b.
c.
d.
Lipids
Proteins
Nucleic Acids
Carbohydrates
A person is lactose intolerant. What type of
molecule is lactose?
a.
b.
c.
d.
Monosaccharide
Disaccharide
Oligosaccharide
Polysaccharide
If a strand of DNA has a sequence
5’-ATCCTAG-3’, what would be the
complementary sequence?
a.
b.
c.
d.
5’-CGAAGAT-3’
5’-TAGGATC-3’
3’-TAGGATC-5’
3’-CGAAGTC-5’
If a cell was grown in a growth medium that has
a radioactive sulfur isotope which class of
biomolecules will show the presence of the
isotope?
a.
b.
c.
d.
Nucleic acids
Carbohydrates
Lipids
Proteins
How can changes in pH affect protein structure?
A.
B.
C.
D.
By causing hydrolysis of the peptide bond
By changing the charges on certain amino acid sidechains
By breaking the sidechains off of the alpha carbons
By joining proteins together in long chains
This would be : A. beta sheet; B. alpha helix; C. nucleic acid; D. lipid
This would be : A. beta sheet; B. alpha helix; C. nucleic acid; D. lipid
• Most biological buffers consist of a pair of
molecules, one an acid and one a base
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Chemical reactions
• Chemical reactions involve the formation or
breaking of chemical bonds
• Atoms shift from one molecule to another
without any change in number or identity of
atoms
• Reactants = original molecules
• Products = molecules resulting from reaction
6H2O + 6CO2
reactants
→
C6H12O6 + 6O2
products
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• Extent of chemical reaction influenced by
1. Temperature
2. Concentration of reactants and products
3. Catalysts
• Many reactions are reversible
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