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CH 5 CQ

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CH 5 CQ
CLICKER QUESTIONS
For CAMPBELL BIOLOGY, NINTH EDITION
Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Chapter 5
The Structure and Function of
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Large Biological Molecules
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Questions prepared by
Jung Choi
Georgia Institute of Technology
© 2011 Pearson Education, Inc.
Which group of large biological molecules is not
synthesized via dehydration reactions?
a) polysaccharides
b) lipids
c) proteins
d) nucleic acids
© 2011 Pearson Education, Inc.
Which polysaccharide has the greatest number of
branches?
a) cellulose
b) chitin
c) amylose
d) amylopectin
e) glycogen
© 2011 Pearson Education, Inc.
Why are human enzymes that digest starch
unable to digest cellulose?
a) Cellulose is made of amino-containing sugars that cannot
be metabolized.
b) Cellulose contains L-glucose instead of D-glucose; starchdigesting enzymes are specific for polymers of D-glucose.
c) Cellulose has beta-glycosidic linkages; starch-digesting
enzymes cleave only alpha-glycosidic linkages.
d) Cellulose has beta-galactoside linkages that only bacterial
beta-galactosidases can cleave.
e) Cellulose fibers are covalently cross-linked; starch-digesting
enzymes cannot cleave these cross-links.
© 2011 Pearson Education, Inc.
Diversity among Biological Macromolecules
Which type of biological polymer has the least diversity
in physicochemical properties and structure?
a) polysaccharides
b) polypeptides
c) DNA
d) RNA
© 2011 Pearson Education, Inc.
Lipids
All lipids
a) are made from glycerol and fatty acids.
b) contain nitrogen.
c) have low energy content.
d) are acidic when mixed with water.
e) do not dissolve well in water.
© 2011 Pearson Education, Inc.
Lipids
Compared to tropical fish, arctic fish oils have
a) more unsaturated fatty acids.
b) more cholesterol.
c) fewer unsaturated fatty acids.
d) more trans-unsaturated fatty acids.
e) more hydrogenated fatty acids.
© 2011 Pearson Education, Inc.
Subunits
If actively growing cells are fed 14C-labeled glucose,
what macromolecules will become radioactive first?
a) proteins
b) starch
c) nucleic acids
d) fatty acids
© 2011 Pearson Education, Inc.
Subunits and Metabolic Labeling
If you want to selectively label nucleic acids being
synthesized by cells, what radioactive compound
would you add to the medium?
a)
35S-labeled
sulfate
b)
32P-labeled
phosphate
c)
14C-labeled
leucine
d) 3H-labeled thymidine
e)
14C-labeled
© 2011 Pearson Education, Inc.
guanine
Protein Structure and Amino Acids
Sickle-cell disease is caused by a mutation in the betahemoglobin gene that changes a charged amino acid,
glutamic acid, to valine, a hydrophobic amino acid.
Where in the protein would you expect to find glutamic
acid?
a) on the exterior surface of the protein
b) in the interior of the protein, away from water
c) at the active site, binding oxygen
d) at the heme-binding site
© 2011 Pearson Education, Inc.
Protein Structure
The sickle-cell hemoglobin
mutation alters what level(s)
of protein structure?
a) primary
b) tertiary
c) quarternary
d) all of the above
e) primary and tertiary
structures only
© 2011 Pearson Education, Inc.
Macromolecular Structures and Bonds
Ceviche is prepared by marinating fresh raw fish in
citrus juice for several hours, until the flesh becomes
opaque and firm, as if cooked. How does citrus juice
render the seafood safe to eat?
a) Acidic pH denatures (unfolds and inactivates) proteins by
disrupting their hydrogen bonds.
b) Citrus juice denatures proteins by disrupting their ionic
bonds.
c) Citrus juice contains enzymes that hydrolyze peptide bonds
to break apart proteins.
d) Citrus juice dissolves cell membranes by disrupting
hydrophobic interactions.
© 2011 Pearson Education, Inc.
RNA and DNA
How does RNA differ from DNA?
a) DNA encodes hereditary information; RNA does not.
b) DNA forms duplexes; RNA does not.
c) DNA contains thymine; RNA contains uracil.
d) all of the above
© 2011 Pearson Education, Inc.
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