life science unit 2, chapter 1. virus a virus is a tiny particle that contains nucleic acid encased...
TRANSCRIPT
![Page 1: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/1.jpg)
Life Science
Unit 2, Chapter 1
![Page 2: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/2.jpg)
Virus
•A virus is a tiny particle that contains nucleic acid encased in protein
![Page 3: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/3.jpg)
Virus
![Page 4: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/4.jpg)
•Virus is much smaller than a cell, 25-250 nanometers (one-billionth of a meter)•About 300 x smaller than a
cell
![Page 5: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/5.jpg)
Alive or not?
• Scientists disagree about whether viruses are living things or not.• They can reproduce (but only by
infecting a living cell)• They can mutate• They have RNA, DNA, and nucleic
acids
![Page 6: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/6.jpg)
Viruses are not made of cellsCannot reproduce/mutate outside of hostCan survive dormant outside of cells for yearsViruses resemble their host cells
![Page 7: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/7.jpg)
THE FLU!
• http://www.youtube.com/watch?v=Rpj0emEGShQ
![Page 8: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/8.jpg)
Virus Reproduction• Viruses want to reproduce!• Because the virus is so much like
their host cells, they can survive only in those hosts• Each virus works only in certain
cells and infects only certain species on bacteria, plants, or animals
![Page 9: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/9.jpg)
Viral Infection
•Viral infection: penetration of a virus or its nucleic acid into a host cell
![Page 10: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/10.jpg)
Read
•Take a couple minutes and read page 89-90
![Page 11: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/11.jpg)
•Get started on your notes from yesterday• Try to finish in about 20
minutes;-)
![Page 12: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/12.jpg)
Summarize• Make sure you include:
• 1: the process by which a virus infects bacteria (what its called and the process)• 2: How viruses infect animal and plant
cells• 3: Retroviruses and an example• 4: The “basic pattern of virus
infection”
![Page 13: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/13.jpg)
Bellwork
•What is the most interesting thing you discovered about your virus?
![Page 14: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/14.jpg)
Bacteria
• Bacteria are one celled,• Have a protective outer wall• Have a jelly-like cytoplasm
with enzymes
![Page 15: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/15.jpg)
![Page 16: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/16.jpg)
•Bacteria move by flagellum (whip like tail)–Wiggling, air,wind, orgnamism, etc.
![Page 17: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/17.jpg)
•Many different types of bacteria–Round=cocci–Rod-shaped=bacillli–Spiral=spirella
![Page 18: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/18.jpg)
![Page 19: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/19.jpg)
![Page 20: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/20.jpg)
• Some bacteria live alone, others lie together•Diplo=pair• Staphylo=cluster• Strepto=chain
![Page 21: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/21.jpg)
![Page 22: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/22.jpg)
• Someone Read page 101, paragraphs 1-2
![Page 23: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/23.jpg)
• Bacteria reproduce asexually–One parent–Identical offspring–Some reproduce through
splitting–Others through budding
![Page 24: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/24.jpg)
•Aerobic-bacteria that need oxygen•Anaerobic-bacteria that do
not )in fact many die in its presence)
![Page 25: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/25.jpg)
• If life conditions are not suitable for bacteria, some may form endospores–Protective capsules that allow
bacteria to live for decades in a dormant state until conditions are favorable
![Page 26: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/26.jpg)
Autotrophs
• Many bacteria are autotrophs-make their food through photosynthesis• Some use hydrogen during
photosynthesis and make sulfur instead of oxygen• Bad smell from rotting food….
![Page 27: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/27.jpg)
Heterotrophs
• Heterotrophs must eat from other organisms-which causes infections • These are the ones that make
us sick
![Page 28: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/28.jpg)
Decomposers
• Get energy from breaking down dead organisms.
![Page 29: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/29.jpg)
articles
• http://news.nationalgeographic.com/news/2008/11/081105-bacteria-mining_2.html
• http://www.dvice.com/archives/2011/12/rock_eating_bac.php
• http://www.livestrong.com/article/29090-good-uses-bacteria/
• http://medcitynews.com/2013/11/biotech-uses-listeria-cancer-therapy/
• http://www.wisegeek.com/what-are-the-different-medical-uses-of-beneficial-bacteria.htm
![Page 30: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/30.jpg)
•Bacteria is both vital for, and harmful to all life on this planet•Give an example of each
![Page 31: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/31.jpg)
Methanogens
• Bacteria that make methane• Anaerobic bacteria • Live in sewage, sediment, intestines,
etc.• Helps animals digest food• Methane produced is essential to our
atmosphere• Too much is harmful, though
![Page 32: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/32.jpg)
Relationships
• Symbiosis-one organism lives on/near/inside another organism and at least one benefits
![Page 33: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/33.jpg)
Symbiosis
![Page 34: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/34.jpg)
Bacteria and Humans
Read the article and do the following:1.summarize your article in no less than 2 paragraphs2. What did you learn about the other uses of bacteria?
![Page 35: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/35.jpg)
Helpful and harmful bacteria• Bacteria in food can make us sick• Nitrogen-fixing bacteria helps to
fertilize crops• Bacteria is involved in much of
the food we eat–Vinegar, cheese, buttermilk,
sour cream, soy sauce, pickles, yogurt
![Page 36: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/36.jpg)
Good bacteria
• http://www.youtube.com/watch?v=6FPy5m1-BQI
![Page 37: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/37.jpg)
• Antibiotics are drugs used to kill harmful bacteria and other microorganisms• They kill by interfering with
bacterial cell functions
![Page 38: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/38.jpg)
• Someone read “overusing a good thing” on 110.
![Page 39: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/39.jpg)
Bacteria and Disease
•Pathogens: disease causing bacteria/microorganisms• They can cause diseases in
humans, animals, and plants
![Page 40: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/40.jpg)
• Some of the diseases caused by bacteria include strep throat, cholera, and leprosy, pneumonia, tuberculosis, typhoid fever
![Page 41: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/41.jpg)
• Bacteria enter the body through natural openings (eyes, nose, mouth) or through breaks in the skin• They destroy healthy cells,
preventing the body from functioning properly
![Page 42: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/42.jpg)
• http://www.youtube.com/watch?v=s-HThHRV4uo
![Page 43: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/43.jpg)
• Other bacteria produce poisons called toxins• Sometimes toxins are released after
bacteria die• Other bacteria cause food
poisoning, infections, and blood poisoning
![Page 44: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/44.jpg)
• Some bacteria may live in a healthy person’s body and be harmless until that person’s resistance is low• When resistance is low your body
can’t fight bacteria as quickly as they reproduce.• Thats why you get sick easier
when you are tired or stresses
![Page 45: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/45.jpg)
•Antibiotics are the primary method for killing bacteria
![Page 46: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/46.jpg)
Food and Bacteria
•Most foods are spoiled by bacteria•When bacteria break down
food they can make it taste bad or even poison it!
![Page 47: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/47.jpg)
Protecting Our Food
• Canning: food is heated to kill bacteria and sealed in airtight containers• Preservatives: Chemicals
added to foods slow the growth of bacteria and mold
![Page 48: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/48.jpg)
Protecting Our Food
• Freeze-Drying: most bacteria need moisture and oxygen to grow. –Freeze-drying removes all the
moisture and then it is sealed in an airtight container
• Pasteurization: the process of heating a liquid to kill harmful bacteria
![Page 49: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/49.jpg)
• Refrigerators and freezers also slow down the growth of bacteria.
![Page 50: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/50.jpg)
Activity
• Read the “Focus on Alexander Fleming”• Then, write a journal entry as if you were
Alex.• Tell about your discovery, how you found
it, what brought you to science, and how your discovery will change science!
• Minimum 4 paragraphs, 5 sentences each;-)
![Page 51: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/51.jpg)
When you finish
•Complete the all of the “review” questions in Chapter 2, Bacteria (pages 100, 104, 107, 110,115)• This will be homework if
not completed in class
![Page 52: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/52.jpg)
Share
• Would Someone Like to Share Their Journal Entry?
![Page 53: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/53.jpg)
Protists
• A protists are organisms that have a nucleus, but is not an animal, plant or fungus.• Some are microscopic, others
are not
![Page 54: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/54.jpg)
![Page 55: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/55.jpg)
Protists
• Many are one celled• All are aquatic ( salt water, fresh
water, watery tissues of other living things)• Some are helpful parasites (like
intestinal bacteria) • Others are harmful
![Page 56: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/56.jpg)
•Some are autotrophs, some are heterotrophs•Some are both!
![Page 57: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/57.jpg)
Plantlike Protists
• 3 Types:–1. Dinoflagellates–2. Euglenas–3. Diatoms
![Page 58: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/58.jpg)
Plantlike Protists
• Dinoflagellates are one-celled ocean organisms living as plankton• Plankton are microscopic
organisms living near the surface of the water• Some of them glow!
![Page 59: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/59.jpg)
Glowing Plankton
http://www.youtube.com/watch?v=uUbIWqiynBY
![Page 60: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/60.jpg)
Too much of a good thing
• Under certain conditions dinoflagellates multiply too rapidly and create a “Red Tide”• They can actually range in color• They can produce toxins that
make fish and people sick
![Page 61: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/61.jpg)
Red Tide
![Page 62: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/62.jpg)
Euglenas
• Both autotrophs and heterotrophs• 3 common features:–1. Pouch with two flagellas, short
and long–2. Chloroplasts–3. Reddish eye spot to determine
photosynthesis
![Page 63: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/63.jpg)
![Page 64: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/64.jpg)
Diatoms
• Live in fresh water, salt water, or soil• They can feed both plankton and
Whales!• Make up 25% of all
photosynthesizing life on Earth• Produce at least 25% of the air we
breathe!
![Page 65: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/65.jpg)
• Diatoms have glass like shells•When they die the shells are
left behind and used for polishing agents and uses that reflective
![Page 66: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/66.jpg)
![Page 67: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/67.jpg)
Algae-Multicellular Protists
• Some reproduce through binary fission, others reproduce sexually• All contain chlorophyll for
photosynthesis• Green algae are the most common• They store more than a billion tons
of carbon, taken from the air during photosynthesis
![Page 68: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/68.jpg)
Brown Algae
• Chemical extracts from brown algae are added to salad dressing to keep them smooth and thick.
![Page 69: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/69.jpg)
Red Algae• Most seaweed is
red algae• Carrageenan
(chemical derived from red seaweed) is used to stabilize creamy food products
![Page 70: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/70.jpg)
Golden Algae
• Can be autotrophs or heterotrophs• Eat bacteria and
one-celled protists
![Page 71: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/71.jpg)
Animal Like Protists
• Animal like because: they are heterotrophs, most can move, don’t have a cell wall
![Page 72: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/72.jpg)
Amoebas
• Animal-like protists• Eat and move
with a pseudopod:• An extension of
cytoplasm “false foot”
![Page 73: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/73.jpg)
Amoebas
• Some are parasites• One type causes
dysentery:• A disease of the
large intestine with diarrhea and pain
![Page 74: Life Science Unit 2, Chapter 1. Virus A virus is a tiny particle that contains nucleic acid encased in protein](https://reader030.vdocuments.site/reader030/viewer/2022032721/56649cd95503460f949a2b33/html5/thumbnails/74.jpg)
Ciliates/Paramecium
• Have tiny hair like parts that move in rhythm• They detect food
to eat• One type of Ciliate
is a paramecium