Question

1. which process allows some viruses to enter a host cell by being enclosed within the cell membrane?

a. diffusion
b. endocytosis
c. active transport
d. lysis

Explanation:

• Diffusion is passive movement of substances down a concentration gradient, not enclosure by cell membrane.
• Endocytosis is the process where a cell engulfs material (including viruses) by enclosing it within a section of its cell membrane, forming a vesicle.
• Active transport uses energy to move substances across the membrane, not enclose them.
• Lysis is the breakdown of a cell, not a viral entry method via membrane enclosure.

Answer:

B. Endocytosis