Question

question 4
1 pts
a layer of lipoprotein and glycoprotein that covers the outer surface of some viruses is the
viroid.
casing.
envelope.
membrane.
capsid.

Explanation:

To solve this, we analyze each option:

• Viroid: A small infectious RNA molecule, not a lipoprotein/glycoprotein layer.
• Casing: Not a standard term for virus structure.
• Envelope: Some viruses have an outer envelope made of lipoprotein and glycoprotein, derived from host cell membranes.
• Membrane: Too general; virus envelope is a specific structure.
• Capsid: Protein shell enclosing genetic material, not the outer lipoprotein/glycoprotein layer.

So the correct term is envelope.

Answer:

C. envelope