Quiz 1

Question 1

The largest difference between Gram + and Gram - bacterial cell is:

Answer 1

The gram + has a much thicker peptidoglycen layer.

Question 2

Why does a Gram + cell stain blue/ purple in a gram stain?

Answer 2

The Gram + cell stains blue/purple because crystal violet remains trapped in the thick peptidoglycan layer

Question 3

Endospres :

Answer 3

Are dormant with no detectable metabolism

Question 4

You have bacteria in need of staining, though you are aware that they have capsules. How do you stain them?

Answer 4

Negative stain, such that the bacterial capsule remains clear

Question 5

The phospholipid bilayer of the bacterial cell membrane consists of phospholipids with:

Answer 5

Hydrophilic heads and hydrophobic tails

Question 6

The peptidoglycan layer consists of:

Answer 6

NAG-NAM interbridges

Question 7

Microbial colonies are:

Answer 7

A visible group of identical bacteria, all originating from a single cell

Question 8

If a bacterial cell swells and busts when placed in a solution, then the solution must be:

Answer 8

Hypotonic

Question 9

The barcode for bacterial life that was introduced in class is:

Answer 9

16s rRNA gene

Question 10

These types of molecules can pass through the cell membrane off a bacteria without a transport protein:

Answer 10

Small, hydrophobic molecules