Which of the following statements is false? a. Enveloped...

Which of the following statements is false? a. Enveloped viruses and naked viruses both may enter cells using the fusion method. b. Many enveloped viruses enter the cell by receptor-mediated endocytosis. c. Naked viruses enter the cell by receptormediated endocytosis. d. Undergoing shape changes and creating channels in the host cell membrane is an alternative method of cell penetration used by naked viruses

Which of the following statements is false?
a. Enveloped viruses and naked viruses both may enter cells using the fusion method.
b. Many enveloped viruses enter the cell by receptor-mediated endocytosis.
c. Naked viruses enter the cell by receptormediated endocytosis.
d. Undergoing shape changes and creating channels in the host cell membrane is an alternative method of cell penetration used by naked viruses

Key Concepts

Receptor-Mediated Endocytosis

Receptor-mediated endocytosis is a process by which viruses bind to specific receptors on the host cell surface, triggering internalization of the virus within an endocytic vesicle. This entry route is common to both enveloped and naked viruses, although the subsequent mechanisms once inside the cell may differ.

Enveloped Viruses

Enveloped viruses have an outer lipid membrane, which allows them to directly fuse with the host cell’s membrane. This fusion process is a primary mechanism by which enveloped viruses enter cells, although many also take advantage of receptor-mediated endocytosis to facilitate entry.

Naked Viruses

Naked viruses lack a lipid envelope and therefore do not have the typical fusion capability seen in enveloped viruses. They primarily use receptor-mediated endocytosis to enter host cells. In some cases, these viruses penetrate cells by inducing shape changes in their capsid proteins that form channels or pores in the cell membrane.

Fusion Mechanism

The fusion mechanism is a cell entry process where the viral envelope merges with the host cell membrane, allowing the viral genome to enter directly into the cytoplasm. This method is predominantly associated with enveloped viruses.

Alternative Cell Penetration Mechanism

Some naked viruses utilize alternative strategies for cell entry that bypass traditional endocytosis, such as causing conformational changes in viral proteins to form channels in the host cell membrane. This mechanism allows the viral genome to access the interior of the cell without relying solely on receptor-mediated endocytosis.

Transcript

Please give Ace some feedback