Lesson 4.5: virus' replication

Question 1

_______ contains ______ for making viruses

Answer 1

-Virus genes
instructions

Question 2

How virus nucleic acids take over the host cell through

Answer 2

1. Attachment: virus binds to the cell surface receptor. (like a lock and key)
2. Penetration: Viral nucleic acid is released inside the host cell. (Replication)
3. Synthesis: The host cell manufactures viral nucleic acids and proteins. (Transcription)
4. Assembly: viruses assembled from synthesized coat proteins,
   enzymes, and nucleic acids. (Translation)
5. Release: New viruses leave the host cell.

Question 3

Two pathways of viruses

Answer 3

Lytic pathway
Lysogenic pathway

Question 4

Difference between two pathways
Activity:
Cycle:

Answer 4

Lytic pathway : can kill the host cells right away. clockwise

Lysogenic pathway: dormant, counterclockwise and can lurk inside for years

Question 5

Mechanism of lytic pathway

Answer 5

Phage expresses genes for proteins and pokes holes in the plasma membrane and cell wall letting the water flow and the cell expand and burst. The bursting or lysis releases new phages that can infect nearby host cells

Question 6

Mechanism of lysogenic pathway

Answer 6

Dna is released and incorporated to the host’s chromosomes as prophage

these prophage forms into a cell, and conjoined cell which replicates as the the host cell divides