Question

select all that apply
bacterial internal membranous structures may appear as choose three ______.

flattened vesicles
lipopolysaccharide
secreted vesicles
spherical vesicles
tubular membranes
extracellular vesicles

Explanation:

To solve this, we analyze each option:

• flattened vesicles: Bacteria can have internal membranous structures as flattened vesicles (e.g., in some photosynthetic bacteria for photosynthesis).
• lipopolysaccharide: This is a component of the outer membrane of Gram - negative bacteria, not an internal membranous structure.
• secreted vesicles: Bacteria secrete vesicles, but the question is about internal membranous structures. Secreted vesicles are external or in the process of being secreted, not internal in the sense of the question.
• spherical vesicles: Internal membranous structures in bacteria can be spherical vesicles, involved in various cellular processes like storage or transport.
• tubular membranes: Some bacteria have internal tubular membranous structures, for example, in the context of cellular organization or metabolic processes.
• extracellular vesicles: These are outside the cell or in the extracellular space, not internal membranous structures of the bacteria.

So the three correct options are flattened vesicles, spherical vesicles, and tubular membranes.

Answer:

A. flattened vesicles, D. spherical vesicles, E. tubular membranes