Week 2 Round-Up

Question 1

two differences between the cell membrane structure of bacteria and archaea?

Answer 1

1. bacteria phospholipids have fatty acid tails
2. archaea have difference between hydrophilic head and hydrophobic tail

Question 2

how does a cell know which proteins should be secreted?

Answer 2

• exoenzyme (extracellular enzyme) synthesized as preprotein
• AA on preprotein form signal sequence
• signal sequence functions as a tag that directs the secretion machinery to move preprotein across the membrane

Question 3

what’s one protein secreted outside a cell that may help bacterial attachment to a host cell surface?

Answer 3

adhesins