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Pick up a book (pg 338) and present trp operon with your team

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Presentation on theme: "Pick up a book (pg 338) and present trp operon with your team"— Presentation transcript:

1 Pick up a book (pg 338) and present trp operon with your team

2 Viruses & the Lytic Cycle
Biolog everl Y

3 What is a Virus? Virus: A biological particle composed of nucleic acid and protein Intracellular Parasites: organism that must use a host cell to reproduce

4 Kingdom of Life?

5 Are Viruses Alive? Cellular Respiration Photosynthesis Transcription
No Not made of cells or organelles Can’t reproduce without host Don’t metabolize energy Don’t perform cellular processes Yes Replication Transcription Active Transport Translation Cellular Respiration Photosynthesis

6 Are Viruses Alive? No Not made of cells or organelles
Can’t reproduce without host Don’t metabolize energy Don’t perform cellular processes Yes Replicate Have nucleic acid Adapt to surroundings Have organization

7 Virus Structure Tail fibers Shape & size varies All Have: Some Have:
1) Capsid: coat of protein that surrounds nucleic acid 2) Nucleic Acid: RNA or DNA Some Have: Tail Fibers: Used for attachment (not legs)

8 Viral Replication Bacteriophages (viruses that attack bacteria) are often studied Replication is similar with many animal viruses Two “life” cycles: Lytic & Lysogenic

9 Lytic Cycle 1st Step: Attachment Virus lands on cell membrane
Viral nucleic acid Capsid RNA DNA ribosome receptor 1st Step: Attachment Virus lands on cell membrane Virus attaches to a cell receptor Virus acts as key; receptor acts as lock

10 Lytic Cycle 2nd Step: Entry DNA/RNA enters the host cell
Viral nucleic acid Capsid RNA DNA ribosome 2nd Step: Entry DNA/RNA enters the host cell DNA/RNA injected DNA/RNA swallowed by the cell

11 Lytic Cycle 2nd Step: Entry DNA/RNA enters the host cell
Viral nucleic acid Capsid RNA DNA ribosome 2nd Step: Entry DNA/RNA enters the host cell DNA/RNA injected DNA/RNA swallowed by the cell

12 Lytic Cycle 2nd Step: Entry DNA/RNA enters the host cell
Viral nucleic acid Capsid RNA DNA ribosome 2nd Step: Entry DNA/RNA enters the host cell DNA/RNA injected DNA/RNA swallowed by the cell

13 Lytic Cycle 3rd Step: Replication DNA Replication Translation
Viral nucleic acid Capsid RNA DNA ribosome DNA Replication Process of creating additional copies of DNA DNA polymerase Transcription Process of creating RNA RNA polymerase Translation Process of creating proteins Performed by ribosomes 3rd Step: Replication Virus DNA performs replication to make more viral DNA Virus DNA/RNA uses ribosomes to make virus proteins Virus proteins created by transcription/translation

14 Lytic Cycle 4th Step: Assembly
Viral nucleic acid Capsid RNA DNA ribosome 4th Step: Assembly New viruses self-assemble in the cytoplasm

15 Lytic Cycle 5th Step: Release
Viral nucleic acid Capsid RNA DNA ribosome 5th Step: Release Virus enzyme causes cell membrane to lyse (burst) Viruses are released Cycle repeats

16 Lytic Cycle 5th Step: Release
Viral nucleic acid Capsid RNA DNA ribosome receptor 5th Step: Release Virus enzyme causes cell membrane to lyse (burst) Viruses are released Cycle repeats

17 Lysogenic Cycle

18 Compare and contrast the lytic and lysogenic cycles

19 In order list the stages of the lytic cycle.
Review In order list the stages of the lytic cycle. In order list the stages of the lysogenic cycle.

20 Transcription/Translation Lab Activity

21 3A1 Quiz

22 Genes Segments of DNA that are the codes for certain characteristics

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