Microbiology Exam 2 UTA; Questions and Answers % Correct
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Micro UTA
Microbiology Exam 2 UTA; Questions and
Answers % Correct
Uniporters Correct answer-Transport in one direction across the membrane
Symporters Correct answer-Functions as co-transporters; the two molecules travel in the
same direction; 1. Energy is released as one substituent moves down its con...
Microbiology Exam 2 UTA; Questions and
Answers % Correct
Uniporters Correct answer-Transport in one direction across the membrane
Symporters Correct answer-Functions as co-transporters; the two molecules travel in the
same direction; 1. Energy is released as one substituent moves down its concentration gradient
2. This energy moves a second substrate against its gradient into the cell
Anitporters Correct answer-Transport a molecule across the membrane while
simultaneously transporting another molecule in the opposite direction; the actively
transported molecule moves in the direction opposite to the driving ion; 1. Antiporter binds
substrate A on the cytoplasmic side of the membrane 2.Antiporter opens to the outside, where
the concentration of A is less 3. Substrate A leaves its binding site, and substrate B then binds to
its site 4. Antiporter opens to the inside of the cell. Substrate B is released in exchange for
substrate A
The Phosphotransferase System in E.coli Correct answer--Type of group translocation
-Best studied system
-Moves glucose, fructose, and mannose
-Five proteins required
-Energy derived from phosphoenolpyruvate (PEP)
-The product Glucose 6-P is used in glycolysis
, Microbiology Exam 2 UTA; Questions and
Answers % Correct
Group Translocation Correct answer-Substance transported is chemically modified during
transport across the membrane, usually phosphorylated
ABC Systems Correct answer--ATP-Binding Cassette systems
- >200 different systems identified in prokaryotes
-Often involved in uptake of organic compounds (e.g. sugars, amino acids), inorganic nutrients
(e.g sulfate, phosphate), and trace metals
-Typically display high substrate specificity
-Contain periplasmic binding proteins
3 components: Periplasmic binding proteins, Membrane- spanning transporter, and ATP-
hydrolyzing protein (i.e ATPase); also requires ATP energy
Shown in diagram at C
Cell Wall Correct answer-How prokaryotes protect the cell membrane? For most species,
the cell envelope includes at least one structural supporting layer and the most common
structural support is _______?
This confers shape and rigidity to the cell and helps it withstand turgor pressure, can see it for
example in E.coli
, Microbiology Exam 2 UTA; Questions and
Answers % Correct
Mycoplasmas Correct answer-An example of a few prokaryotes who have a cell
membrane with no outer layers
It's difficult to Gram stain
Sacculus Correct answer-The bacterial cell wall, or this, consists of a single- interlinked
molecule; for example disaccharide or peptidoglycan
Needed to maintain high pressure and solubility in order to maintain its shape
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