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