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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

© 2011 Pearson Education, Inc.

The Structure and Function of Large Biological Molecules: Proteins (1)

Chapter 5

Questions prepared by

Ana Martins

© 2011 Pearson Education, Inc.

Enzymes are:

a) Fatty acid molecules

b) Proteins which have functions of transport and movement in the cell

c) Antibodies

d) Nucleic acids

e) Biocatalysts

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Hormones may be:

a) Carbohydrate or protein molecules

b) Proteins molecules only

c) Carbohydrates or lipid molecules

d) Steroids or protein molecules

e) None of the above

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Milk casein is an example of:

a) A transport protein

b) A defense protein

c) A storage protein

d) A sensory protein

e) All of the above

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Which of the following statements concerning transport proteins is false:

a)Hemoglobin is a transport protein which carries oxygen from the lungs to the cells

b)Transport proteins allow molecules that otherwise would be excluded by the phospholipid bilayer, to enter the cell

c) Transport proteins bind hormones on the outside of the cell

d) Several membrane proteins are transport proteins

e) None of the above

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Contractile and motor proteins are the main components of:

a) the cell nucleus

b) the cell cytoskeleton

c) plant cell walls

d) cell membranes

e) the exoskeleton of crabs

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Proteins are more diverse than:

a) Carbohydrates only

b) Lipids only

c) Carbohydrates and lipids only

d) Any other group of macromolecules

e) Nucleic acids only

f) None of the above

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Keratin is a structural protein that exists in:

a) The cocoon of silk worms and spider webs

b) Milk

c) Plant seeds

d) Hair, horns, feathers

e) None of the above

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Sensory proteins:

a) Bind to hormones and emit a secondary messenger inside the cell that will carry out cellular functions

b) Transport molecules that otherwise would not cross the phospholipid bilayer

c) Sense stimuli and initiate processes inside the cell

d) Exist in plant cell walls, where they sense light and initiate photosynthesis

e) None of the above

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Examples of defensive proteins in the human body are:

a) Casein and hemoglobin

b) Casein and antibodies

c) Keratin and hemoglobin

d) Antibodies

e) All of the above

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The bonding of two amino acid molecules to form a larger molecule requires which of the following?

a) removal of a water moleculeb) addition of a water moleculec) formation of a glycosidic bondd) formation of a hydrogen bonde) both removal of a water molecule and formation of a hydrogen bond

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Which level of protein structure do the α helix and the β pleated sheet represent?

a) primaryb) secondaryc) tertiaryd) quaternarye) primary, secondary, tertiary, and quaternary

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Hemoglobin is a protein with which level of structure?

a) primary

b) secondary

c) tertiary

d) quaternary

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The peptide bond is established between:

a) the amino groups of two amino acids

b) the amino group of one amino acid and the carboxyl group of another amino acid

c) the carboxyl groups of two amino acids

d) the hydroxyl groups of the side chains of two amino acids

e) none of the above

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All of the following contain amino acids except

a) hemoglobin.

b) cholesterol.

c) antibodies.

d) enzymes.

e) insulin.

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The peptide bond is established between:

a) the amino groups of two amino acids

b) the amino group of one amino acid and the carboxyl group of another amino acid

c) the carboxyl groups of two amino acids

d) the hydroxyl groups of the side chains of two amino acids

e) none of the above

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Secondary level of protein structure is stabilized by:

a) van der Waals interactions between atoms in the peptide backbone

b) hydrogen bonds between atoms in the amino acid side chains

c) ionic interactions between atoms in the side chains

d) hydrogen bonds between atoms of the peptide backbone

e) none of the above

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The primary structure of a protein is:

a) stabilized by hydrogen bonds between atoms of the peptide backbones

b) the sequence of amino acids in the polypeptide chain

c) the way the protein folds due to interactions between atoms of the side chains of amino acids

d) encoded in RNA molecules

e) none of the above

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Polypeptides are

a) polymers of monosaccharides

b) branched polymers of amino acids

c) unbranched polymers of amylose and amylopectin

d) unbranched polymers of amino acids

e) not polymers

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What type of covalent bond between amino acid side chains (R groups) functions in maintaining a polypeptide's specific three-dimensional shape?

a) ionic bond

b) hydrophobic interaction

c) van der Waals interaction

d) disulfide bond

e) hydrogen bond