1. The E. coli phosphotransferase system transports glucose into the cell by: A. serving as a carrier protein that pumps glucose into the cell in an energy-dependent manner against its concentration gradient. B. serving as a carrier protein that pumps glucose into the cell in an energy-independent manner against its concentration gradient. C. keeping levels of intracellular glucose very low by efficiently phosphorylating intracellular glucose in an energy-dependent set of reactions. D. keeping levels of intracellular glucose very low by efficiently phosphorylating intracellular glucose in a set of spontaneous reactions. E. none of the above. 2. The cytoplasmic membrane is a A. highly selective permeability barrier of the cell. B. primary structure that maintains the shape of the cell. C. source of nutrient production. D. structure which identifies a cell as eukaryotic or prokaryotic. E. none of the above 3. Light will be __________________ when it interacts with an object that is smaller than the light\'s wavelength. A) refracted. B) reflected C) absorbed. D) scattered. e) transformed Solution 1. Option C is the correct answer. This process chemically alters the glucose by phosphorylation in an energy dependent manner. This way glucose enters the cell and is then phosphorylated to form glucose -6- phosphate. This change maintains the concentration gradient and allows more glucose to flow into the cell. As glucose -6- phosphate is unable to move out of the cell. Thus intercellular levels increase and intracellular level remains low..

1. 1. The E. coli phosphotransferase system transports glucose into the cell by:
A. serving as a carrier protein that pumps glucose into the cell in an energy-dependent manner
against its concentration gradient.
B. serving as a carrier protein that pumps glucose into the cell in an energy-independent manner
against its concentration gradient.
C. keeping levels of intracellular glucose very low by efficiently phosphorylating intracellular
glucose in an energy-dependent set of reactions.
D. keeping levels of intracellular glucose very low by efficiently phosphorylating intracellular
glucose in a set of spontaneous reactions.
E. none of the above.
2. The cytoplasmic membrane is a
A. highly selective permeability barrier of the cell.
B. primary structure that maintains the shape of the cell.
C. source of nutrient production.
D. structure which identifies a cell as eukaryotic or prokaryotic.
E. none of the above
3. Light will be __________________ when it interacts with an object that is smaller than the
light's wavelength.
A) refracted.
B) reflected
C) absorbed.
D) scattered.
e) transformed
Solution
1. Option C is the correct answer. This process chemically alters the glucose by phosphorylation
in an energy dependent manner. This way glucose enters the cell and is then phosphorylated to
form glucose -6- phosphate. This change maintains the concentration gradient and allows more
glucose to flow into the cell. As glucose -6- phosphate is unable to move out of the cell. Thus
intercellular levels increase and intracellular level remains low.