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MBI 201 Exams || very Flawless.

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All of the following are components of bacterial cell wall EXCEPT: a. N-acetylglucosamine b. lipopolysaccharide c. amino acids d. N-acetymuramic acid correct answers b. lipopolysaccharide Which of the following statements about membrane lipids is true? a. Lipids of bacteria have ether linka...

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MBI 201 Exams || very Flawless.
All of the following are components of bacterial cell wall EXCEPT:
a. N-acetylglucosamine
b. lipopolysaccharide
c. amino acids
d. N-acetymuramic acid correct answers b. lipopolysaccharide

Which of the following statements about membrane lipids is true?
a. Lipids of bacteria have ether linkages, while those of archaea have ester linkages.
b. Lipids of bacteria and archaea have ester linkages.
c. Lipids of bacteria and archaea have ether linkages.
d. Lipids of bacteria have ester linkages, while those of archaea have ether linkages. correct
answers d. Lipids of bacteria have ester linkages, while those of archaea have ether linkages.

Directed movements of bacteria toward or away from a chemical signal are known as
a. flagellation
b. locomotion
c. gliding
d. chemotaxis correct answers d. chemotaxis

All of the following are true about prokaryotic outer membranes EXCEPT that they
a. contain endotoxin.
b. are lipid bilayers containing lipopolysaccharides.
c. are found only in Gram-negative bacteria.
d. are the target for the antibiotic penicillin. correct answers d. are the target for the antibiotic
penicillin.

In bacteria, the macronutrients ___ are commonly found in nucleic acids and proteins.
a. C, O, N, H
b. C, O, K, H
c. C, O, P, S
d. N, S, Ca, H correct answers a. C, O, N, H

The proteins embedded in a membrane require that region to be
a. crystalline.
b. hydrophobic.
c. positively charged.
d. hydrophilic.
e. negatively charged. correct answers b. hydrophobic.

Which one of the following is FALSE regarding the proton motive force (PMF)?
a. PMF is the only force that can be used for flagella movement.
b. PMF sometimes can be used for nutrient uptake.
c. PMF is an electrochemical potential across the bacterial cell membrane.

, d. PMF is a major force for ATP generation in microbes. correct answers a. PMF is the only
force that can be used for flagella movement.

Which one of the following is NOT correct regarding the roles of membrane proteins?
a. Membrane proteins can sense external signals such as presence of nutrients or toxins.
b. Membrane proteins are involved in transport of ions and nutrients across the membrane.
c. Membrane proteins are involved in secretion of toxins, proteins, and molecules for
communication.
d. Membrane proteins determine the fluidly of the cell membrane. correct answers d. Membrane
proteins determine the fluidly of the cell membrane.

Why can't bacteria grow in solutions with very high concentrations of sugar?
a. Bacteria cannot digest pure sugar.
b. Sugar lowers the solution's osmolarity.
c. Sugar lowers the solution's pH.
d. Sugar raises the solution's pH.
e. Sugar raises the solution's osmolarity. correct answers e. Sugar raises the solution's osmolarity.

Growth of most microorganisms occurs by
a. budding.
b. binary fission.
c. segregation.
d. replication. correct answers b. binary fission.

A cafeteria worker who fails to wash his hands thoroughly and fails to wear gloves inoculates a
quiche with 4 E. coli cells when he uses his finger to test whether it is done. By the time you
purchase the quiche, there are 128 E. coli cells in it. How many generations did the cells go
through? correct answers 5

Which of the following represents a coupled transport system where two molecules travel in the
same direction? correct answers symport

Which of the following statements is FALSE about the E. coli phosphotransferase system (PTS)?
a. The substrate is phosphorylated during transport, sequestering sugars inside the cytoplasm.
b. The system has a modular design that accommodates different substrates.
c. The phosphate antiport is used to transport glucose or other simple sugars into the cell.
d. Phosphoenolpyruvate (PEP) contributes to the energy requirement in the PTS transport.
correct answers c. The phosphate antiport is used to transport glucose or other simple sugars into
the cell.

Only less than 1% of microbes in nature are cultured in labs because correct answers it is
challenging to identify the growth factor needed for the successful cultivation.

Organisms that are adapted to grow at very high pressures (up to 1000 atm) are called correct
answers barophiles

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