Exam 2: Microbial Cell Structure and Function

The terms "run" and "tumble" are generally associated with

In general,swimming is performed with flagella,whereas gliding uses other cellular components such as pili.

Using bright-field microscopy to look at a slide prepared with a basic dye you observe cells under 400X magnification with a clear inner compartment within the cell.The cell is most likely a(n)

A bacterial cell is interpreted as gram-positive when it forms purple insoluble crystal violet-iodine complexes within the cell during the Gram stain.

Bacteria with type IV pili

Explain the differences between uniporters,symporters,and antiporters.

A major function of prokaryotic gas vesicles is to

Macromolecules resulting from lysosomal digestion are used in cellular biosynthesis and energy generation.

Where within a eukaryotic cell is ribosomal RNA (rRNA)synthesized?

Both hydrophilic and charged molecules readily diffuse through the cytoplasmic membrane.

Predict what would happen to a motile bacterium undergoing chemotaxis if the Mot proteins suddenly ceased to function.

You have discovered a new bacterial strain that causes urinary tract infections.Closely related bacterial species cannot cause infections.You compare the strains and find that your new strain has structures composed of protein external to its cell wall.What structures might your new strain have that the other strains do not? Why?

All eukaryotes contain

Some membrane proteins are involved in bioenergetic reactions,while others are involved in membrane transport.

The membrane of a gas vesicle is composed of

Using phase contrast microscopy on a wet mount of live cells,you observe motile bacilli moving rapidly and randomly through the field of view,changing directions after a brief tumble and taking off in a different direction.These cells are exhibiting ________ motility.

What is the biological function of endospores?

The energy source derived from the charge separation across the cytoplasmic membrane is referred to as

Bacteria stain as gram-positive or gram-negative because of differences in the cell

What type of microscope would you use to visualize the internal structures of a chloroplast? Support your conclusion with evidence based on the size of the structures you want to see and the resolution and magnification power of different types of microscopes.