Science 7

Next Science Test:
 “Micro-Organisms and Germ Theory of Disease”
Unit Test (QUARTERLY)
• Friday, January 22
• Study guide is also posted online

Homework: Science
 I recommend completing SLIDE 10 from your unit review slides this evening
 Unit Review Slides are due on Friday, January 22

POSTER: Compare the four kinds of protists we have looked at. For each do all of the below: ( 10 minutes )
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A picture of each organism (labeled with major organelles!)
Identify as protozoa or algae
Identify whether it is a producer or consumer
Describe how it moves
Describe how it eats
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Identify one similarity it shares with the other three protists
Identify one unique feature that none of the other three have in common with it.

Today’s Topic:

Characteristics of Living Things: Vocabulary
There are seven characteristics that all living things share with one another:
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All living things RESPIRATE
All living things EXCRETE waste
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All living things require NUTRIENTS
All living things GROW
All living things REPRODUCE
All living things are SENSITIVE to their environment
All living things MOVE

Viruses: Notes
Viruses are tiny bits of DNA, wrapped in a protein shell. However, they do not meet several of the characteristics of life:
 Viruses are not made of cells, they are much, much tinier than a single cell
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Viruses do not require nutrients in order to survive, because they have no life processes
Viruses cannot reproduce on their own
Viruses do not respond to their environment
Viruses do not respirate, excrete waste, or grow

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Viral Reproduction:
Viruses cannot reproduce on their own, but they do reproduce by infecting host cells
Host cell- a cell that has been infected by a virus; steps of a viral infection are listed below
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Virus attaches to host cell
Virus injects its DNA into the host cell
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Viral DNA rewrites the DNA of the host cell
Host Cell begins to assemble more viruses (think virus factory)
Host Cell bursts, releasing thousands of copies of the virus

Exit Ticket Passcode: “fall”
 Access the “Exit Tickets” page of DeBolt’s wiki
 Click on the link for today’s exit ticket
 Complete the quiz before leaving class
 Name format:
“your period number, Last name, First name”