Question

select all that apply
which two of the following types of proteins are found in the periplasmic space of gram-negative bacteria?

exoenzymes
integral membrane proteins
enzymes that synthesize peptidoglycan
transport proteins
porin proteins

Explanation:

1. Exoenzymes: Exoenzymes are often found in the periplasmic space of Gram - negative bacteria as they can be released into this space to act on substrates.
2. Enzymes that synthesize peptidoglycan: Peptidoglycan synthesis in Gram - negative bacteria involves enzymes in the periplasmic space since the peptidoglycan layer is between the inner and outer membranes.
3. Integral membrane proteins: These are embedded in the membranes (inner or outer), not in the periplasmic space.
4. Transport proteins: Many transport proteins are integral membrane proteins (in the inner or outer membrane) and not in the periplasmic space.
5. Porin proteins: Porin proteins are in the outer membrane, not in the periplasmic space.

Answer:

• exoenzymes
• enzymes that synthesize peptidoglycan