Exam 3: Bacterial Cell Structure

Many bacteria facilitate the uptake of iron by secreting low molecular weight molecules,called ___________,to form complexes with the iron that can then be readily transported into the cell. ASM

Organisms usually have only a single transport system for any nutrient. ASM

_______ bind ferric iron and transport it into a bacterial cell.

Matching: Match the definition with the word. 1)monotrichous 2)peritrichous 3)lophotrichous 4)amphitrichous a.a single flagellum b.a single flagellum at each pole of an organism c.a cluster of flagella at one or both ends of an organism d.a relatively even distribution of flagella over the entire surface of the bacterium

__________ is the process through which endospores are formed within a vegetative cell.

Permease proteins that aid in the transport of nutrients resemble enzymes in their specificity for the substance to be transported.Each carrier is selective and will transport only a closely related set of substances. ASM

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

Which of the following processes can be used to bring nutrients into a cell against a concentration gradient?

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

Intracellular granules of organic or inorganic material that are stockpiled by bacteria for future use are called __________.

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

Bacteria that do not have a fixed shape are said to be __________.

Chemotaxis is a process by which bacteria

Which of the following is not a major class of growth factors?

Nutrients can be concentrated from dilute solutions by

Which of the following is a characteristic of active transport?

If you remove the peptidoglycan layer from a Gram positive cell,it would still stain purple with a Gram stain.

Twitching or gliding motility involves

Which of the following is/are true of capsules?

Sedimentation coefficients are proportional to the molecular weight of a particle and are not affected by the volume and shape of the particle.