lecture #6 prokaryotic cells

Question 1

size of prokaryotic cells

Answer 1

1 - 10 um

Question 2

what does a prokaryotic cell contain

Answer 2

DNA (free in cytoplasme), ribosomes, cell wall, outer capsule

Question 3

in domain bacteria, what is the cell wall composed of

Answer 3

peptidoglycan = protein + Carb
(not cellulose, like in plant cells)!!!

Question 4

how is the cell wall , what is it used for

Answer 4

very strong, resists bursting - maintains shape

Question 5

what is a Gram-positive cell wall (domain bacteria)

Answer 5

thick peptidoglycan (many layers), plasma membrane

Question 6

what is a Gram-negative cell wall (domain bacteria)

Answer 6

outer membrane, and thin peptinoglycan, plasma membrane

Question 7

why is it necessary to know if a bacteria is gram negative or positive?

Answer 7

to check which one causes an infection, and then administore the right treatment

Question 8

which is harder to kill ? ( Graham - or + )

Answer 8

Graham - , because extra layer gives more protection

Question 9

why do some prokaryotes produce a capsule?

Answer 9

• protects them from drying
• helps the cells adhere to things
• protects the cell from destruction by white blood cells

Question 10

what do domain Archae have associated with their DNA

Answer 10

histones (proteins) (like eukaryotes)

Question 11

what is different with domain archae cell wall compared to domain
bacteria cell walls

Answer 11

they do not have peptidoglycan in their cell wall