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Food science > Microbial physiology > Flashcards

Microbial physiology Flashcards

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1
Q

Function of cell membrane

A

Barrier, transporting nutrients and energy production

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1
Q

What colour are gram negative cells?

A

Light pink

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2
Q

What colour are gram positive cells?

A

Dark violet

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3
Q

Examples of gram positive bacteria

A

Bacillus
Clostridium
Listeria
Staphylococcus

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4
Q

What is the basic building block of the cell wall?

A

Peptidoglycan

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5
Q

What else makes up the cell wall?

A

NAG and NAM

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6
Q

How can peptidoglycan be broken down?

A

Lysozyme cuts bonds between sugars

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7
Q

What does LPS consist of?

A

Lipid A, polysaccharide and O-antigen side chains

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8
Q

What does LPS stand for?

A

Lipopolysaccharide

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9
Q

Role of LPS

A

Surface antigenic determination of gram negative cells and is highly toxic

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10
Q

Anabolism vs Catabolism

A

Building up vs Breaking down

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11
Q

What are microaerophiles?

A

Require oxygen but lower than atmospheric pressure

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12
Q

What is glycolysis?

A

Converting glucose into pyruvate

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13
Q

What is gained from glycolysis?

A

2ATP and 1NADH

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14
Q

What does pyruvate become after glycolysis?

A

CO2
H2O
Lactic acid
Ethanol

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15
Q

What bacteria create spores?

A

Gram positive

16
Q

What are prototrophy bacteria?

A

Synthesise all their nutrients and metabolic requirements from inorganic material and glucose

17
Q

What do prokaryotic and eukaryotic microbes do to kill off competition?

A

Produce substances

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