Exam 3: Bacterial Cell Structure

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.

Bacteria growing at lower temperatures have more saturated fatty acids in their membranes.

Small circular DNA molecules capable of replicating and containing genes that are useful but not necessary to the bacterium are called __________.

Sortase is a protein enzyme of bacteria that

Which of the following is not considered a micronutrient?

Square planar arrangement of cells that forms when round bacteria remain attached to each other during reproduction are called

__________ __________ are required organic compounds because they are essential cell components or precursors of such components that cannot be synthesized by the organism.(2 words) Blooms Level: 1.Remember Learning Outcome: 03.03.03 Provide examples of growth factors needed by some microorganisms Section: 03.03

__________ are carrier proteins embedded in the membrane that increase the rate of diffusion of specific molecules across selectively permeable membranes. Blooms Level: 1.Remember Learning Outcome: 03.03.04 Compare and contrast passive diffusion,facilitated diffusion,active transport,and group translocation and provide examples of each Section: 03.03

The term used to describe bacteria that are rod shaped is

Phosphorus can be obtained from organic sources only. ASM

Sulfur can be obtained from inorganic sources only. Blooms Level: 1.Remember Learning Outcome: 03.03.02 Distinguish macroelements (macronutrients)from micronutrients (trace elements)and provide examples of each Section: 03.03

Some photosynthetic bacteria produce gas vacuoles that regulate their buoyancy but contain no lipid.

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

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.

Endospores represent a challenge to the fields of industrial and medical microbiology because

Which of the following protects bacteria from lysis in dilute solutions and helps to determine their cellular morphology or shape?

The movement of molecules across a membrane from an area of higher concentration to an area of lower concentration with the use of a carrier molecule embedded in the membrane is called

Zinc (Zn)is considered a macronutrient. Blooms Level: 1.Remember Learning Outcome: 03.03.02 Distinguish macroelements (macronutrients)from micronutrients (trace elements)and provide examples of each Section: 03.03

In many spirochetes,multiple flagella combine to form a bundle known as a(n)____________ fibril,which winds around the cell and confers motility on the cell.

A __________ layer consists of diffuse unorganized polysaccharide material that lies outside the cell wall and is easily removed.