Human Microbiome

Question 1

Human Microbiome

Answer 1

all the microbes in the human body and includes species from each major domain

Question 2

How many human cells are there in the body?

Answer 2

10^13

Question 3

How many microbial cells are there?

Answer 3

10^14

Question 4

What percentage of cell in the human body aren’t human?

Answer 4

75-90%

Question 5

How does the nose protect you?

Answer 5

inhaled pathogens get trapped in the mucous

Question 6

In the nose, Staphylococcus epidermidis:

Answer 6

forms a biofilm that coats the inside of the nose

Question 7

How many bacteria do you have in your mouth?

Answer 7

10 billion

Question 8

What’s on your teeth?

Answer 8

a biofilm or plaque

Question 9

Fusobacterium sp.

Answer 9

larger bacteria that form a scaffold for many other bacteria in the oral biofilm

Question 10

We have about __ sq ft of skin

Answer 10

19

Question 11

How many million bacteria are there per inch of skin?

Answer 11

35

Question 12

3 types of microhabitats

Answer 12

oily, dry, moist

Question 13

Are bacteria on the skin gram-positive or gram-negative?

Answer 13

gram-(+)

Question 14

Why is skin hard to colonize (4)

Answer 14

dry, salty, acidic, protective oils

Question 15

3 attributes of Propionibacterium acnes

Answer 15

gram positive, digests sebum, causes acne

Question 16

Helicobacter pylori

Answer 16

produces urease, which hydrolyzes urea, produces ammonia, and neutralizes stomach acid

Question 17

4 characteristics of Helicobacter pylori

Answer 17

1. gram negative
2. most common cause of ulcers in humans
3. causes stomach cancer
4. urease positive

Question 18

What 2 things may Helicobacter pylori protect you from?

Answer 18

asthma and GRD

Question 19

Bacteroides thetaiotamicron

Answer 19

digests your food

Question 20

Is Bacteroides gram (-) or gram (+)?

Answer 20

gram negative