MCB 3023 FINAL (EXAM 1 SECTION, PART 2)
QUESTIONS WITH VERIFIED ANSWERS
Enveloped viruses are mainly associated with which of the following?
A. Plant and animals
B. Animals
C. Plants and bacteria
D. Plants
E. Bacteria - Answers - b. animals
Term for microbes that grow optimally at very high salt concentrations.
A. Thermophiles
B. Barophiles
C. Osmolphiles
D. Halophiles
E. psychrophiles - Answers - d. halophiles
If a cell culture contains 400 cells/mL at time = 0 and it has a generation time of 30
minutes, how many cells (cells/mL) will be present after 2 hours of incubation?
A. 2400 (cell/mL)
B. 6400 (cell/mL)
C. 1600 (cell/mL)
D. 1200 (cell/mL)
E. 3200 (cell/mL) - Answers - b. 6400
What is the most abundant form of nitrogen in the biosphere?
A. Nitrate
B. Ammonia
C. Nitrite
D. Nitrous oxide
E. Dinitrogen - Answers - e. dinitrogen
Vibrio natriegens has a growth rate of:
A. 0.3 generations per hour
B. 20 minutes
, C. 6 generations per hour
D. 10 minutes
E. 3 generations per hour - Answers - c. 6 generations per hour
Which of these is one of the main functions of the cytoplasmic membrane in Archaea?
A. It gives the cell its characteristic shapes
B. It prevents the diffusion of gases into and out of the cell
C. It acts as a semi permeable barrier to the diffusion of molecules into and out of the
cell
D. It protects against effects of differing osmotic pressure
E. It allows attachment to specific receptor molecules on solid surfaces in the
environment
C - Answers - c. it acts as a semi permeable barrier to the diffusion of molecules into &
out of the cell
All known hyperthermophiles possess this enzyme to increase the supercoiling of the
DNA and help stabilize it at high temperatures
A. Histone
B. Taq polymerse
C. Ligase
D. Thermosome
E. Reverse DNA gyrase
E - Answers - e. reverse DNA gyrase
How does the cytoplasmic membrane of Archaea differ from the Bacteria membrane?
A. The archaeal membrane contains cholesterol
B. The archaeal membrane is comprised of isoprenoids attached to glycerol phosphate
by an ether linkage
C. The archaeal membrane contains no proteins
D. The archaeal membrane gives the cell its characteristic shape
E. The archaeal membrane is comprised of fatty acids attached to glycerol phosphate
by an ester linkage - Answers - b. the archeal membrane is comprised of isoprenoids
attached to glycerol phosphate by an ether linkage
QUESTIONS WITH VERIFIED ANSWERS
Enveloped viruses are mainly associated with which of the following?
A. Plant and animals
B. Animals
C. Plants and bacteria
D. Plants
E. Bacteria - Answers - b. animals
Term for microbes that grow optimally at very high salt concentrations.
A. Thermophiles
B. Barophiles
C. Osmolphiles
D. Halophiles
E. psychrophiles - Answers - d. halophiles
If a cell culture contains 400 cells/mL at time = 0 and it has a generation time of 30
minutes, how many cells (cells/mL) will be present after 2 hours of incubation?
A. 2400 (cell/mL)
B. 6400 (cell/mL)
C. 1600 (cell/mL)
D. 1200 (cell/mL)
E. 3200 (cell/mL) - Answers - b. 6400
What is the most abundant form of nitrogen in the biosphere?
A. Nitrate
B. Ammonia
C. Nitrite
D. Nitrous oxide
E. Dinitrogen - Answers - e. dinitrogen
Vibrio natriegens has a growth rate of:
A. 0.3 generations per hour
B. 20 minutes
, C. 6 generations per hour
D. 10 minutes
E. 3 generations per hour - Answers - c. 6 generations per hour
Which of these is one of the main functions of the cytoplasmic membrane in Archaea?
A. It gives the cell its characteristic shapes
B. It prevents the diffusion of gases into and out of the cell
C. It acts as a semi permeable barrier to the diffusion of molecules into and out of the
cell
D. It protects against effects of differing osmotic pressure
E. It allows attachment to specific receptor molecules on solid surfaces in the
environment
C - Answers - c. it acts as a semi permeable barrier to the diffusion of molecules into &
out of the cell
All known hyperthermophiles possess this enzyme to increase the supercoiling of the
DNA and help stabilize it at high temperatures
A. Histone
B. Taq polymerse
C. Ligase
D. Thermosome
E. Reverse DNA gyrase
E - Answers - e. reverse DNA gyrase
How does the cytoplasmic membrane of Archaea differ from the Bacteria membrane?
A. The archaeal membrane contains cholesterol
B. The archaeal membrane is comprised of isoprenoids attached to glycerol phosphate
by an ether linkage
C. The archaeal membrane contains no proteins
D. The archaeal membrane gives the cell its characteristic shape
E. The archaeal membrane is comprised of fatty acids attached to glycerol phosphate
by an ester linkage - Answers - b. the archeal membrane is comprised of isoprenoids
attached to glycerol phosphate by an ether linkage
