Bacteria are very active but not yet reproducing in which phase:S
elect one:
B) lag
Mesophiles grow best at:
Select one:
B) 25-30
Halophiles require an environment with a high concentration of _________ for optimal growth.
Select one:
B) salt
Serial dilutions are used to:
Select one:
D) obtain bacterial cultures at several different concentrations
Klebsiella os
-a genus of bacteria of the family Enterobacteriaceae containing nonmotile
-gram-negative, frequently encapsulated rods that are arranged singly, in pairs, or in short chains.
-includes some human pathogens.
clostridium
genus of rod-shaped, spore-forming, chiefly anaerobic bacteria including the nitrogen-fixing bacteria found in soil and those causing botulism and tetanus.
Sporulation occurs in:
Select one:
D) clostridium
Sporulation
can be triggered by adverse conditions, or as part of asexual reproduction
Sporulation usually occurs in response to :
Select one:
D) a decrease in the level of carbon or nitrogen
Starch would be broken down to maltose by which of the following enzymes?
Select one:
C) amylase
Amylase
is any of a group of enzymes that catalyze the hydrolysis of starch to sugar to produce carbohydrate derivatives
Maltase
is one enzyme produced by the cells lining the small intestine to break down disaccharides.
Cellulase
is any of several enzymes produced chiefly by fungi, bacteria, and protozoans that catalyze the hydrolysis of cellulose
Lipase
is any enzyme that catalyzes the cleavage of a fatty acid anion from a triglyceride or phospholipid
Gram positive bacteria have:
Select one:
A) peptidoglycan in the cell walls
When a bacterial cell divides into two cells, the new cells are called:
Select one:
A) daughter cells
A daughter cell
is a cell formed by the division or budding of another cell; "anthrax grows by dividing into two daughter cells that are generally identical"
Lysis
is the death of a cell by bursting, often by viral or osmotic mechanisms that compromise the integrity of the cellular membrane.
plasmodesmata
The cell membrane pulls away from the cell wall, but the cell remains joined to the adjacent cells at points called plasmodesmata. Thus, the cell takes on the appearance of a pincushion, with the plasmodesmata almost ceasing to function because they have become so constricted. This condition is known as plasmolysis.
Plasmolysis
is the contraction of the protoplasm of cells within plants due to the loss of water through osmosis. It is when the cell membrane peels off of the cell wall and the vacuole collapses when placed in a hypertonic environment.
When cells are placed in a hypertonic environment they will undergo _________.
Select one:
