chpt 6-mcb 2004

An important mineral ion of the cytochrome pigments of cellular respiration is

iron

Diffusion of water through a semipermeable membrane is called

osmosis.

What compound has the highest concentration in a cell?

H2O

Obligate saprobes can adapt to a living host.

False

The movement of substances from lower to higher concentration across a semipermeable membrane that must have a specific protein carrier and cell expenditure of energy is called

active transport

When microbes are in a close nutritional relationship, and one benefits but the other is not harmed, it is called

commensalism

The movement of molecules from an area of high concentration to an area of lower concentration is called

diffusion

The use of energy by a cell to enclose a substance in its membrane by forming a vacuole and engulfing it is called

endocytosi

The movement of substances from higher to lower concentration across a semipermeable membrane that must have a specific protein carrier but no energy expenditure is called

facilitated diffusion.

An organism that can exist in both oxygen and oxygenless environments is a(n)

facultative anaerobe

An organism that cannot tolerate an oxygen environment is a(n)

facultative anaerobe

The time interval from parent cell to two new daughter cells is called the

generation time

The term chemoheterotroph refers to an organism that

gets energy by oxidizing chemical compounds.

Human pathogens fall into the group

mesophiles.

Most of the dry weight of a microbial cell is from

organic compounds

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

oxygen.

Organisms called _____ live on or in the body of a host and cause some degree of harm.

parasites

A microaerophile

requires a small amount of oxygen but won't grow at normal atmospheric levels.

The term facultative refers to

the ability to exist in a wide range of conditions.

A barophile would grow best in

the deep oceans