Exam 3: Bacterial Cell Structure

Endospores are resistant to most environmental stressors because they have _____ complexed with calcium ions which stabilize DNA.

All of the following statements about the periplasmic space are true except:

Which of the following is/are true of capsules?

Sulfur can be obtained from inorganic sources only.

The trace amounts of micronutrients needed by microorganisms are usually supplied as inadvertent contaminants in water and regular media components.

The cell membrane is a rigid structure that provides bacteria with their characteristic shapes.

Molecules or regions of molecules that readily interact with water are said to be __________,whereas molecules or regions of molecules that are insoluble in water or do not readily interact with water are said to be hydrophobic.

The movement of molecules across a membrane from an area of lower concentration to an area of higher concentration with the expenditure of energy is called

Which of the following is not considered a macronutrient?

The movement of molecules from an area of higher concentration to an area of lower concentration without the participation of specific carrier molecules is called

Different transport systems for the same nutrient that are part of the same organism are usually regulated in different ways.

A strain of Neisseria gonorrhoeae has undergone a mutation and is no longer able to make pili.Predict the most likely outcome.

Although penicillin inhibits peptidoglycan synthesis,bacterial cells will continue to grow normally in the presence of penicillin in a(n)__________ environment.

Which of the following contribute to the environmental resistance of bacterial endospores?

Twitching or gliding motility involves

The bacterium E.coli swims in a straight line,called a __________,for a few seconds; then it stops,tumbles,then swims away in a new direction.

The extreme insolubility of ferric iron leaves little free iron available for transport into bacterial cells.

The layers of peptidoglycan of the bacterial cell wall can be cross-linked by peptide intrabridges or by direct cross-linking.

All of the following are reasons why some scientists believe that the term "prokaryote" is a somewhat artificial designation and should be discarded except

You discover a new transport system used by a newly discovered bacterial species.The sugars that are transported using this system are phosphorylated as they enter the bacterial cell.You would describe this transport system as a(n)_____.