MCB3020 Exam 1 UPDATED Questions and
CORRECT Answers
Gram-positive bacteria have a thinner layer of peptidoglycan than gram-negative bacteria. -
CORRECT ANSWER - False
The concept that human and animal diseases are caused by microorganisms is called the -
CORRECT ANSWER - Germ theory
Who is credited with developing and documenting the first vaccination procedure against
smallpox? - CORRECT ANSWER - Edward Jenner
Although penicillin inhibits peptidoglycan synthesis, bacterial cells will continue to grow
normally in the presence of penicillin in a(n) __________ environment. - CORRECT
ANSWER - isotonic
Which of the following contribute to the environmental resistance of bacterial endospores? -
CORRECT ANSWER - -Lower pH
-Low water content of endospores
-Spore coat
-Presence of calcium dipicolinate
External structures that are found in Archaea but not Bacteria are _________. - CORRECT
ANSWER - Hami
Chemotaxis is a process by which bacteria - CORRECT ANSWER - move toward an
attractant or away from a repellent
The Archaea generally lack which of the following that are normally found in gram-negative
bacteria? - CORRECT ANSWER - -A complex peptidoglycan network
-Outer membrane
, -lipopolysaccharide
Transport of two different substances can be linked. If the transport is in the same direction it is
called __________; if the transport is in opposite directions it is called __________. -
CORRECT ANSWER - Symport, antiport
Although developed over 100 years ago, Koch's postulates continue to be used successfully in all
known human infectious diseases. - CORRECT ANSWER - False
Which of the following is not part of the process by which an endospore transforms to become a
vegetative cell? - CORRECT ANSWER - Induction
Which of the following are part of the process by which an endospore transforms to become a
vegetative cell? - CORRECT ANSWER - -Outgrowth
-Activation
-Germination
_______ is a peptidoglycan-like molecule found in the cell walls of some archaea. - CORRECT
ANSWER - pseudomurein
During the lag phase of microbial growth, the cells are metabolically inactive. - CORRECT
ANSWER - false
The most widely accepted current model for membrane structures is called the __________
model. - CORRECT ANSWER - fluid mosaic
Penicillin inhibits bacterial growth by preventing the cross-linking during peptidoglycan
synthesis. Why does penicillin not inhibit growth of archaeal cells? - CORRECT
ANSWER - Most archaeal cells have a cell wall, but it is not composed of peptidoglycan.
CORRECT Answers
Gram-positive bacteria have a thinner layer of peptidoglycan than gram-negative bacteria. -
CORRECT ANSWER - False
The concept that human and animal diseases are caused by microorganisms is called the -
CORRECT ANSWER - Germ theory
Who is credited with developing and documenting the first vaccination procedure against
smallpox? - CORRECT ANSWER - Edward Jenner
Although penicillin inhibits peptidoglycan synthesis, bacterial cells will continue to grow
normally in the presence of penicillin in a(n) __________ environment. - CORRECT
ANSWER - isotonic
Which of the following contribute to the environmental resistance of bacterial endospores? -
CORRECT ANSWER - -Lower pH
-Low water content of endospores
-Spore coat
-Presence of calcium dipicolinate
External structures that are found in Archaea but not Bacteria are _________. - CORRECT
ANSWER - Hami
Chemotaxis is a process by which bacteria - CORRECT ANSWER - move toward an
attractant or away from a repellent
The Archaea generally lack which of the following that are normally found in gram-negative
bacteria? - CORRECT ANSWER - -A complex peptidoglycan network
-Outer membrane
, -lipopolysaccharide
Transport of two different substances can be linked. If the transport is in the same direction it is
called __________; if the transport is in opposite directions it is called __________. -
CORRECT ANSWER - Symport, antiport
Although developed over 100 years ago, Koch's postulates continue to be used successfully in all
known human infectious diseases. - CORRECT ANSWER - False
Which of the following is not part of the process by which an endospore transforms to become a
vegetative cell? - CORRECT ANSWER - Induction
Which of the following are part of the process by which an endospore transforms to become a
vegetative cell? - CORRECT ANSWER - -Outgrowth
-Activation
-Germination
_______ is a peptidoglycan-like molecule found in the cell walls of some archaea. - CORRECT
ANSWER - pseudomurein
During the lag phase of microbial growth, the cells are metabolically inactive. - CORRECT
ANSWER - false
The most widely accepted current model for membrane structures is called the __________
model. - CORRECT ANSWER - fluid mosaic
Penicillin inhibits bacterial growth by preventing the cross-linking during peptidoglycan
synthesis. Why does penicillin not inhibit growth of archaeal cells? - CORRECT
ANSWER - Most archaeal cells have a cell wall, but it is not composed of peptidoglycan.
