Question

multiple choice question
animal cells secrete a surrounding ______ that is a mixture of proteins and other molecules.
cell wall
blastula
lipopolysaccharide capsule
extracellular matrix

Explanation:

• Cell wall: Plant cells have cell walls, not animal cells.
• Blastula: A blastula is an early - stage embryo in animals, not a surrounding structure secreted by cells.
• Lipopolysaccharide capsule: This is more commonly associated with bacteria, not animal cells.
• Extracellular matrix: Animal cells secrete an extracellular matrix which is a complex mixture of proteins (such as collagen) and other molecules (like proteoglycans).

Answer:

extracellular matrix