Exam 1 Lecture 1 Flashcards

1
Q

Robert Hooke

A

First to visualize “cells”

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2
Q

Antonie van Leeuwenhoek

A

First to visualize microbes

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3
Q

How far can we see with the unaided human eye?

A

40 micrometers (10^-6 m)

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4
Q

Which tools can we use to best visualize microbes?

A

light microscope, electron microscope, x-ray crystallography

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5
Q

Edward Jenner

A

reported cowpox vaccination against smallpox (one of the first successful vaccines)

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6
Q

Florence Nightingale

A

discovers that hygiene is the best way to prevent infection/illness

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7
Q

Louis Pasteur

A

pivotal in disproving spontaneous generation hypothesis, developed swan-necked flask experiment, shows microbes as causative agents of disease

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8
Q

Koch

A

formed Koch’s postulates to show microbes as causative agents of disease

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9
Q

Hans Christian Gram

A

developed gram stain, which is a key method to differentiate between gram-positive and gram-negative bacteria

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10
Q

Paul Ehrlich

A

discovered arsphenamine aka 606 or salvarsan, the first effective treatment for syphilis

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11
Q

Alexander Fleming

A

best known for discovering the world’s first broad antibiotic, penicillin

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12
Q

Ernst Chain and Howard Florey

A

successfully purified and concentrated penicillin, also played a role in increasing the production of penicillin

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13
Q

Gerhard Domagk

A

discovered sulfonamides as an effective treatment for bacterial infections

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14
Q

Avery, MacLeod, McCarty

A

discovered that DNA is the substance that leads to bacterial transformation - this was proved by injecting purified DNA from Streptococcus into harmless bacteria of a mouse. the bacteria became virulent

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15
Q

Watson, Crick, Rosalind Franklin

A

figured out the structure of DNA (helical)

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16
Q

Sanger

A

discovered protein sequencing and DNA sequencing

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17
Q

Rich Roberts

A

known for isolation of restriction enzymes, essential to cutting out specific regions of DNA

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18
Q

Herb Boyer, Stanley Cohen

A

made significant contributions to recombinant DNA technology

19
Q

Kary Mullis

A

invented PCR, which is used to amplify a small sample of DNA

20
Q

Next Gen Sequencing

A

developed in the 2000s, allows for rapid and cheap DNA/RNA sequencing

21
Q

Cocci (coccus)

22
Q

Bacilli (bacillus)

A

rod-shaped

23
Q

Coccobacilli

A

intermediate between cocci and bacilli (short rods)

24
Q

Fusiform (gram-neg)

A

spindle-like shape

25
Vibrio (gram-neg)
curved-rod shape
26
Spirilla (gram-neg)
corkscrew (spiral) shape, rigid, flagella on outside of cells, most are NOT pathogenic
27
Spirochetes (gram-neg)
corkscrew (spiral) shape, flexible, flagella is on the inside of cells in the periplasm, pathogenic (Lyme's disease, syphilis)
28
What are the multi-cellular arrangements bacteria can take on?
diplococci, chains, clusters, tetrad, biofilms
29
What ribosomes do prokaryotes have?
70S
30
What does the 70S ribosome consist of?
5S, 16S, 23S rRNA sequences (16S critical to identify start codon!) also over 50 proteins
31
Do prokaryotes contain sterols?
No - they contain hopanoids
32
What is significant about Mycoplasma?
They do not have a cell wall! Therefore do not contain structures that are common for GP and GN bacteria (ex: do not contain PG). They do, however, contain cytoplasmic membrane
33
Lipoteichoic acid
characteristic of Gram + bacteria, they are teichoic acids anchored to lipid membrane
34
Do all bacteria have capsule/slime layer?
No, it depends on the species of bacteria specifically within GP and GN
35
Do all bacteria have pili/flagella?
No, it depends on the species of bacteria specifically within GP and GN and if they have transformative/motility/adhesive properties
36
O-specific side chains of LPS are found in...
LPS of Gram negative bacteria
37
True or false: gram negative bacteria have outer membrane and inner membrane
True
38
What does Lipid A do?
It is endotoxin, and when cell is lysed, endotoxin is released and can overstimulate the immune response
39
What are functions of core polysaccharide of LPS?
- largely serve as disguise mechanisms to fool the immune system - important for complement resistance
40
Bacterial structures provide 4 main things:
1. staining differences 2. triggers innate response 3. triggers adaptive immune response 4. targets for small molecules that we can antibiotics or antimicrobials
41
Framework for what is causing infection
Staining pattern, morphology, specimen site, patient history
42
True or false: we can use DNA sequences to identify bacteria
True - we can use this information to diagnose, come up with a treatment plan, administer the appropriate antibiotic to interrupt infection
43
How can we classify bacteria? (5 things)
1. Taxonomy 2. Phylogeny 3. Phenotype 4. Genotype 5. Microbiome
44
Phenotype can tell us:
morphology, biochemical capabilities; fatty acid (membrane and by-products); mycolic acid analysis (found in the membrane of Mycobacteria)