Microorganisms require large quantities of this nutrient for use in cell structure and metabolism:
Microorganisms require small quantities of this nutrient for enzyme function and maintenance of protein structure:
An organic nutrient that cannot be synthesized by the organism and must be provided is called a/an:
D. growth factor.
An important mineral ion that is a component of chloroplasts and stabilizer of membranes and ribosomes is:
The methanogens, producers of methane gas, require environments that:
anaerobic with hydrogen gas and CO2.
The movement of molecules from an area of high concentration to an area of lower concentration is called:
The movement of substances from lower to higher concentration across a semi-permeable membrane that must have a specific protein carrier and use energy is called:
The movement of substances from higher to lower concentration across a semi-permeable membrane that must have a specific protein carrier but no energy expenditure is called
The use of energy by a cell to enclose a substance in its membrane by forming a vacuole and engulfing it is called:
When bacteria that are living in a freshwater stream moved to seawater, then what would happen?
It would shrivel.
Cultures of a bacterial species were incubated on the shelf of a refrigerator, out on a lab benchtop, on the shelf of a 37C incubator and on the shelf of a 50C incubator. After incubation, there was no growth at 37C and 50C, slight growth out on the benchtop, and abundant growth at refrigeration. What term could be used for this species?
Cultures of a bacterial species were incubated out on the incubator shelf, in an anaerobic jar and in a candle jar. After incubation there was moderate growth of cultures in the candle and anaerobic jars, but heavy growth of the culture on the incubator shelf. This species is a/an:
C. facultative anaerobe.
A microorganism that has an optimum growth temperature of 37C but can survive short exposure to high temperatures is called a/an:
An organism that grows slowly in the cold but has an optimum growth temperature of 32C is called a/an:
All of the following could find a location in or on body tissues suitable for growth, except:
A microorganism that does not have catalase or superoxide dismutase would find it difficult to live in an environment with:
Which of the following choice is true in case of a microaerophile?
It requires a small amount of oxygen but won't grow at normal atmospheric levels.
The E. coli that normally live in the human large intestines and produce vitamin K that the body uses would be best termed a _____ relationship.
The phase of the bacterial growth curve in which the rate of multiplication equals the rate of cell death is the:
The phase of the bacterial growth curve in which newly inoculated cells are adjusting to their new environment, metabolizing but not growing is the:
In the viable plate count method, a measured sample of a culture is evenly spread across an agar surface and incubated. Each _____ represents one _____ from the sample.
An organism that grows best at a higher CO2 tension than is normally present in the atmosphere is a(n):
Plant roots provide various growth factors for soil bacteria, and the bacteria help fertilize the plant by supplying it with minerals. This is an example of:
The stage in a normal growth curve when cells reach the maximum rate of cell division is the:
The decline in growth rate during the death phase is due to all of the following, except:
the decrease in temperature of the culture.
Which of the following methods of enumerating cells is the only one to detect live cells?
viable plate count
If a culture starts out with 1 cell and after 4 hours there are 64 cells, how many generations have occurred?
44. You inoculate a culture into a test tube containing broth and take it out of the incubator the next day. You see the culture is growing equally throughout the broth. You conclude the culture must be:
C. facultative anaerobe.
You inoculate a culture into a test tube containing broth and take it out of the incubator the next day. You see the culture is growing at the bottom of the tube. You conclude the culture must be:
Most microorganisms on earth can only live and survive in habitats that are similar to human body conditions.
Facilitated diffusion and active transport require a carrier protein to mediate the movement across the plasma membrane.
The time that it takes for a freshly inoculated agar culture to develop visible colonies is principally governed by that species generation time.
In a commensal relationship, the commensal benefits but the cohabitant is neither harmed nor benefited.
Microorganisms that live in severe habitats, such as very hot, acidic, or salty environments, are called _____.
When whole cells or large molecules in solution are engulfed by a cell, this endocytosis is specifically termed _____.
Mediated transport of polar molecules and ions across the plasma membrane utilizes a _____ _____ that will bind to the substance effecting a conformational change that allows movement across the membrane.