BIOCHEMISTRY 9TH EDITION CAMPBELL TEST BANK

BIOCHEMISTY AND THE ORGANIZATION OF CELLS




BIOCHEMISTRY 9TH EDITION CAMPBELL TEST
BANK

,BIOCHEMISTY AND THE ORGANIZATION OF CELLS




MULTIPLE CHOICES

1) Mycoplasmas are bacteria that lack cell walls. On the basis of this structural
feature, which
statement concerning mycoplasmas should be true?
A) They are gram-negative.
B) They are subject to lysis in hypotonic conditions.
C) They lack a cell membrane as well.
D) They undergo ready fossilization in sedimentary rock.
E) They possess typical prokaryotic flagella.

B
Topic: Concept 27.1

: Knowledge/Comprehension



2) Though plants, fungi, and prokaryotes all have cell walls, we place them in different
taxa.
Which of these observations comes closest to explaining the basis for placing these
organisms in different taxa, well before relevant data from molecular systematics
became
available?
A) Some closely resemble animals, which lack cell walls.
B) Their cell walls are composed of very different biochemicals.
C) Some have cell walls only for support.
D) Some have cell walls only for protection from herbivores.
E) Some have cell walls only to control osmotic balance.

B
Topic: Concept 27.1

,BIOCHEMISTY AND THE ORGANIZATION OF CELLS


: Knowledge/Comprehension



3) Which is the bacterial structure that acts as a selective barrier, allowing nutrients to
enter
the cell and wastes to leave the cell?
A) plasma membrane
B) capsule
C) cell wall
D) nucleoid region
E) pili

A
Topic: Concept 27.1

: Knowledge/Comprehension
546



4) Which statement about bacterial cell walls is false?
A) Bacterial cell walls differ in molecular composition from plant cell walls.
B) Cell walls prevent cells from bursting in hypotonic environments.
C) Cell walls prevent cells from dying in hypertonic conditions.
D) Bacterial cell walls are similar in function to the cell walls of many protists, fungi,
and
plants.
E) Cell walls provide the cell with a degree of physical protection from the
environment.

C
Topic: Concept 27.1

, BIOCHEMISTY AND THE ORGANIZATION OF CELLS


: Knowledge/Comprehension



5) Which of these is the most common compound in the cell walls of gram-positive
bacteria?
A) cellulose
B) lipopolysaccharide
C) lignin
D) peptidoglycan
E) protein

D
Topic: Concept 27.1

: Knowledge/Comprehension



6) Penicillin is an antibiotic that inhibits enzymes from catalyzing the synthesis of
peptidoglycan, so which prokaryotes should be most vulnerable to inhibition by
penicillin?
A) mycoplasmas
B) gram-positive bacteria
C) archaea
D) gram-negative bacteria
E) endospore-bearing bacteria

B
Topic: Concept 27.1

: Knowledge/Comprehension



7) The predatory bacterium, Bdellovibrio bacteriophorus, drills into a prey bacterium
and, once