- Study guides, Revision notes & Summaries

MICR221 EXAM QUESTIONS WITH REVISED ANSWERS Commensal/Mutualistic bacteria of the GI tract - Answer-Lactobacillus, Bacteriodes, Bifidobacterium, Clostridium, Escherichia, Enterococcus Anaerobes in large intestine - Answer-Bacteriodes, Bifidobacterium, and Clostridium Bacteria adapted to stomach's low pH - Answer-Helicobacter Urease - Answer-Enzyme used for acid tolerance by Helicobacter Aerobes - Answer-Require molecular oxygen and final electron acceptor is oxygen. Anaerobes -...

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2 pages

Written in 2024/2025

Grade A+

Perfectscorer

MICR221 TESTED QUESTIONS WITH ANSWERS ALL CORRECT what transport system traps substrate through the movement of phosphate through a cascade complex - Answer-phosphotransferase what transport family uses ATP to move substrate in and out of the cell - Answer-ATP binding casette family why can bacteria that passively diffuse out compete bacteria that actively diffuse in certain environements - Answer-while active bacteria have to split ATP into growing and consuming nutrients, bacteria that...

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5 pages

Written in 2024/2025

Grade A+

Perfectscorer

Micr221 Final Exam Questions With Answers 100% Verified ...

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24 pages

Written in 2025/2026

Grade A+

Evergreenview

MICR221 EXAM QUESTIONS WITH COMPLETE SOLUTIONS Define death of microorganisms - Answer-Loss of ability to multiply under any known conditions Define sterilisation - Answer-Complete removal or destruction of all microorganisms from inanimate objects. Non-selective physical and chemical methods Define disinfection - Answer-Destruction or removal of microorganisms (but not bacterial endospores) on inanimate objects by physical or chemical methods Define antisepsis - Answer-Chemicals ap...

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22 pages

Written in 2024/2025

Grade A+

Perfectscorer

MICR221 EXAM QUESTIONS WITH CERTIFIED ANSWERS What are the two classes of transport proteins - Answer-B-barrel and a-helicle bundle How do Amphiphatic Transport proteins get their name - Answer-They need to function in hydrophobic conditions (bilipid layer) and have a hydrophilic core for transport.. What are the 3 main types of active transporters - Answer-- Major facilitator Superfamily (MFS) - ATP binding cassette (ABC) superfamily - Group translocation (phosphotransferase system)...

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3 pages

Written in 2024/2025

Grade A+

Perfectscorer

MICR221 MIDTERM TEST QUESTIONS WITH ALL ANSWERS VERIFIED Extracellular Polysaccharide - Answer-Capsule! - not every bacteria -often lost in lab - ex. slime found in lungs of CF patients (pseudomonas aerginosa) is due to capsule - this is why antibiotics don't really work - can't get through capsule - protects from desiccation (98% water) - protects from predation - helps cell adhere to surfaces - but bio fouling is bad! Capsule gene organization - Answer-Region 1 - (5 genes) - tran...

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11 pages

Written in 2024/2025

Grade A+

Perfectscorer

MICR221 EXAMINATION QUESTIONS WITH ALL CORRECT ANSWERS AB toxins - Answer-A has toxic enzymatic activity and B binds to receptors on host cells so A can be internalised by endocytosis botulinum toxin - Answer-blocks release of acteylcholine from stimulatory motor neurons so no muscle contraction and flaccid paralysis tetanus toxin - Answer-blocks release of glycine (stops acetylcholine release) from inhibitory interneurons stimulating muscle contraction (uncontrolled) how botulinum an...

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21 pages

Written in 2024/2025

Grade A+

Perfectscorer

MICR221 TEST QUESTIONS WITH ALL CORRECT ANSWERS Define disinfectant - Answer-Chemicals that are capable of killing microorganisms, cannot be applied to tissues, in the laboratory they are applied to inanimate surfaces and used in discard jars and buckets Define antiseptics - Answer-Chemical agents that kill or inhibit growth of microorganisms and are sufficiently non-toxic to be applied to living tissues Define preservatives - Answer-Included in pharmaceutical preparations or foods to pr...

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22 pages

Written in 2024/2025

Grade A+

Perfectscorer