Environmental Control of Metabolism Flashcards

1
Q

Aseptic

A

Techniques employed to try to maintain sterile conditions and eliminate contaminants while working with microorganisms.

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2
Q

Biosynthesis

A

Building up of a complex molecule from simpler ones by a cell.

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3
Q

Phase of growth during which the number of cells dying exceeds the number of new cells being produced.

A

Death

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4
Q

Fermenter

A

Specialised container used to culture microorganisms on a large scale to obtain a useful product.

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5
Q

Mean generation time

A

Average time taken for a population of cells to double in number.

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6
Q

Growth

A

Process that occurs when an organism’s rate of synthesis of organic materials exceeds the rate of their breakdown.

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7
Q

Growth medium

A

Substance such as nutrient agar or broth used to culture micro organisms.

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8
Q

Inducer

A

Metabolite which insures that the gene coding for a certain enzyme remains switched on.

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9
Q

Inhibitor

A

Metabolite which acts on an enzyme at an earlier stage in a pathway exerting negative feedback control.

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10
Q

Phase of growth during which cells adjust to the growth medium and show increased metabolic activity but no increase in the number.

A

Lag

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11
Q

Phase of growth during which cells grow and multiply at the maximum rate.

A

Log/exponential

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12
Q

Manipulation

A

Process by which a micro organism’s metabolism is deliberately altered to make it produce large quantities of a metabolite.

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13
Q

Precursor

A

Metabolite which occurs early in a pathway and gives rise to another metabolite later in the pathway.

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14
Q

Primary

A

Metabolite made by a microbe and essential for its growth.

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15
Q

Secondary

A

Metabolite made by a microbe but not essential for its growth.

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16
Q

Type of graph paper where each set of values on the Y axis is 10 times greater than the set in the previous cycle below.

A

Semi-logarithmic

17
Q

Phase of growth during which the rate of production of new cells equals the death rate of the old ones.

A

Stationary