Exam III

Question 1

Which of the following is NOT TRUE of the Par system identified in bacteria:
A. As soon as replication begins, POP Z anchors one strand of the chromosome to the stalked end by interacting with ParB
B. Par B binds parS
C. ParA with its ATPase activity pulls the new chromosome to the non-stalked pole
D. All of the above are true
E. None of the above are true

Answer 1

D

Question 2

Which is NOT true of psychrophilic bacteria?
A. Proteins/ enzymes have more α- helices
B. Proteins have a high degree of hydrophobic interations
C. Membranes have long chain fatty acids
D. Membranes have saturated fatty acids
E. All of the above are true
D. None of the above are true

Answer 2

A.

Question 3

Which of the following would NOT be used by an acidophile:
A. Possession of a more impermeable membrane
B. sudden use of a sodium motive force instead of a proton motive force
C. Possession of a proton translocating pump that pumps out hydrogens.
D. A buildup of potassium inside the cell
E. All of the above are used by acidophiles
F. None of the above are used by acidophiles

Answer 3

B

Question 4

Which of the following is TRUE regarding bacterial DNA
A. The two strands of DNA are arranged in a parallel fashion.
B. The sugar deoxyribose provides a negative charge to the DNA molecule
C. A purine always pairs with a pyrimidine.
D. The B-form is predominant with one helical turn containing 11 base pairs
E. All of the above
F. None of the above

Answer 4

C

Question 5

T/F? FtsZ polymerization is inhibited by high concentrations of Min CD in cocci-shaped bacteria

Answer 5

False

Question 6

T/F In the death phase of a closed batch culture, cells decline at a slow but still exponential rate

Answer 6

True

Question 7

T/F? Bacteria can regulate their internal temperature in an effort to stabilize themselves in different environments

Answer 7

False

Question 8

T/F? Thermophilic microorganisms tend to have unsaturated fatty acids dominating within their membranes

Answer 8

False

Question 9

T/F? All hyperthermophiles are found in the Archaeal domain

Answer 9

False

Question 10

T/F? Exopolysaccharide coatings are common amongst thermophilic and hyperthermophilic organisms to keep the inside of the cell from getting too hot

Answer 10

False

Question 11

T/F? Most acidophiles are categorized within the Archaeal domain rather than the Bacterial domain

Answer 11

True

Question 12

T/F? Alkaliphiles tend to use a sodium motive force to drive transport reactions and rotate flagella

Answer 12

True

Question 13

All prokaryotes use organic molecules as compatible solutes trying to survive in hypertonic environments

Answer 13

False

Question 14

T/F? The majority of prokaryotic microorganisms have one circular chromosome

Answer 14

True

Question 15

Are dilutions required in the viable count technique?

Answer 15

Yes

Question 16

Length of time needed to obtain results for the viable count method?

Answer 16

hours

Question 17

Which of the following would be found within the elongasome?
A. FtsA
B. Fts K
C. FtsI
D. Zip A
E. All of the above
F. none of the above

Answer 17

C

Question 17

Is the following statement T/F? An alkaliphile that grows in an environment of ph 10 accounts for the same increase in its internal cytoplasmic pH by expressing additional chaperone proteins. Defend your answer

Answer 17

False
Alkaliphile wouldn’t increase the internal pH to 10 because cells only survive in a pH of 5-9

Question 18

T/F? The amount of compatible solute that can be maintained by a cell is genetically determined

Answer 18

True

Question 19

In bacteria the chromosome is condensed through the action of ___________ (enzyme name). These enzymes are categorized into class 1 or 2 molecules based on______________. The ____________ are a family of antibiotics that target the most common class 2 enzymes
-T/F? these enzymes require energy when adding and removing supercoils

Answer 19

-topoisomerase
-the number of strands they nick
-Quinolones
-true

Question 20

_______________ provided evidence that larger organisms such as maggots do not spontaneously generate

Answer 20

redi

Question 21

Ribulose-5-phosphate is the key intermediate that allows versatility in the ___________ pathway

Answer 21

pentose-phosphate pathway

Question 22

DNA is the second largest molecule in a bacterial cell. The largest molecule is _____________

Answer 22

peptidoglycan