Exam 15: Host Defenses II: Specific Immunity and Immunization

Mediated transport of polar molecules and ions across the plasma membrane utilizes a(n)_____ carrier that binds to the substance and causes a conformational change to allow its movement across the membrane.

Which organism has a challenge to maintain cellular electrolyte and fluid balance in its environment?

A halophile would grow best in ______.

The phase of the bacterial growth curve that shows the maximum rate of cell division is the ______.

The phase of the bacterial growth curve in which newly inoculated cells are adjusting to their new environment,metabolizing but not growing at an exponential rate,is the ______.

Facilitated diffusion is limited by

All of the following could find a location in or on human body tissues suitable for growth except ______.

Endospore-forming bacteria like Bacillus species begin the sporulation process with an asymmetric cell division to produce two cells with different fates.One will differentiate into the endospore,and the other is the sporangium that will ultimately lyse to release the mature endospore.During this asymmetric cell division,one of the compartments does not receive an intact copy of the chromosome.Which compartment can function with only part of the genome and why?

Bacteria living in a freshwater stream that are transferred to ocean water would

Microbes in a biofilm use quorum sensing to

A saprobe differs from a parasite in that

The time it takes for a freshly inoculated agar culture to develop visible colonies is primarily governed by the generation time of that species.

Microorganisms require large quantities of ______ for use in cell structure and metabolism.

A microorganism that does not have catalase or superoxide dismutase would find it difficult to live in an environment with ______.

Microorganisms that live in severe habitats,such as very hot,acidic,or salty environments,are called ______.

A saprobe with a cell wall will utilize extracellular digestion.

A loopful of bacteria containing 1000 bacterial cells is inoculated into a nutrient broth and incubated.After a negligible lag phase,the culture goes into exponential growth for two hours.The generation time for the bacterium is fifteen minutes.Which equation is the correct one to determine the number of cells present after two hours of log phase growth?

A Coulter counter can count viable cells as well as determine their size.

Organisms that feed on dead organisms for nutrients are called ______.

Whether an organism is a phototroph or a chemotroph depends on its source of energy.