Exam III Flashcards
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
D
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
A.
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
B
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
C
T/F? FtsZ polymerization is inhibited by high concentrations of Min CD in cocci-shaped bacteria
False
T/F In the death phase of a closed batch culture, cells decline at a slow but still exponential rate
True
T/F? Bacteria can regulate their internal temperature in an effort to stabilize themselves in different environments
False
T/F? Thermophilic microorganisms tend to have unsaturated fatty acids dominating within their membranes
False
T/F? All hyperthermophiles are found in the Archaeal domain
False
T/F? Exopolysaccharide coatings are common amongst thermophilic and hyperthermophilic organisms to keep the inside of the cell from getting too hot
False
T/F? Most acidophiles are categorized within the Archaeal domain rather than the Bacterial domain
True
T/F? Alkaliphiles tend to use a sodium motive force to drive transport reactions and rotate flagella
True
All prokaryotes use organic molecules as compatible solutes trying to survive in hypertonic environments
False
T/F? The majority of prokaryotic microorganisms have one circular chromosome
True
Are dilutions required in the viable count technique?
Yes
Length of time needed to obtain results for the viable count method?
hours
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
C
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
False
Alkaliphile wouldn’t increase the internal pH to 10 because cells only survive in a pH of 5-9
T/F? The amount of compatible solute that can be maintained by a cell is genetically determined
True
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
-topoisomerase
-the number of strands they nick
-Quinolones
-true
_______________ provided evidence that larger organisms such as maggots do not spontaneously generate
redi
Ribulose-5-phosphate is the key intermediate that allows versatility in the ___________ pathway
pentose-phosphate pathway
DNA is the second largest molecule in a bacterial cell. The largest molecule is _____________
peptidoglycan
