The periplasmic space is
A)larger in gram-positive bacteria.
B)made up of lipopolysaccharides and phospholipids.
C)an important reaction site for substances entering and leaving the cell.
D)where peptidoglycan is located.
E)absent in gram-negative bacteria.04.15 Describe the structure of the cell membrane and explain several of its major roles in bacterial cells.

Question

Quizplus · Accepted Answer

The periplasmic space is an important reaction site for substances entering and leaving the cell.

Answer: E
 The periplasmic space is absent in gram-negative bacteria.

Regarding the second question, since it asks for multiple answers, there are different ways to answer it. Here's one possible solution:

Answer: 
- The cell membrane in bacteria is a phospholipid bilayer with embedded proteins, and its basic structure is similar to that of eukaryotic cells.
- The cell membrane has several roles in bacterial cells, including:
	- Controlling the entry and exit of substances into and out of the cell, which is crucial for nutrient uptake, waste removal, and other cellular processes.
	- Maintaining the proton motive force that drives ATP synthesis and other membrane-dependent reactions.
	- Serving as a scaffold for various enzymatic complexes and receptor proteins that participate in signal transduction, chemotaxis, and other cellular responses.
	- Providing a barrier against toxins, detergents, and other harmful agents that could disrupt cell function or integrity.
	- Regulating cell shape, size, and division by interacting with the cell wall and cytoskeleton.

The Periplasmic Space Is