Biology Unit Nineteen Protists Mrs Pearsons Second Semester
Biology Unit Nineteen - Protists Mrs. Pearson’s Second Semester Biology *For those watching by recording, watch for questions on the slides throughout the presentation. Email me the answers to the questions within two days of the lesson being presented in order to receive credit for watching the recording.
Law and Theory… It’s Science!
“Be the change you wish to see in the world. ” Mahatma Gandhi • “One of the great engineering feats of the 20 th century was the construction fo the Panama Canal. One of the great feats of public health was that the loss of life among construction workers to malaria and yellow fever during the canal’s construction was not higher. • The United States began work on the canal in 1904. By late 1906, the death rate due to malaria among workers was 11. 59 per 1000. Public health officials implemented a multifaceted program to make the environment less mosquito-friendly, largely by draining ponds and cutting brush. By December 1909, the death rate from malaria had dropped to 1. 23 per 1000. ” • Nowicki, Stephen. Mc. Dougal Littell’s Biology. Teacher’s Edition. Page 580
Be the Change • In Africa, a child dies every 45 seconds due to malaria (Moore, Mandy. ABC News. com. ) • Mosquito nets coated with pesticides can protect people from mosquito bites as they sleep. • http: //saveone. net/filter/Malaria#866953/No thing-But-Nets-Mandy-Moore-and-a-younggirl-raise-money-for-bed
Be the Change • http: //saveone. net • www. nothingbutnets. org
19. 1 Diversity of Protists KEY CONCEPT Kingdom Protista is the most diverse of all the kingdoms.
19. 1 Diversity of Protists Lesson Objectives • Recognize characteristics of all protists • Recognize characteristics and differences between animal-like, plant-like and fungus-like protists
What you’ve been waiting for… Prefix Practice!! • • • Hetero. Photo. Multi. Pseudo. Bio-
19. 1 Diversity of Protists What do you do with an organism that doesn’t fit into the categories of plants, fungus, or animal? • Protists are eukaryotes that are not animals, plants, or fungi.
19. 1 Diversity of Protists • Animal-like protists consume other organisms. – heterotrophs – single-celled *Those watching by recording, include in your email the two characteristics of animal-like protists listed above.
19. 1 Diversity of Protists • Plantlike protists are photosynthetic – what does that mean? – single-celled, colonial, or multicellular – no roots, stems, or leaves *Those watching by recording, include in your email what photosynthetic means.
19. 1 Diversity of Protists • Funguslike protists decompose dead organisms. – heterotrophs – can move, whereas fungi cannot
19. 1 Diversity of Protists are difficult to classify. • Protista is one kingdom in the domain Eukarya.
19. 1 Diversity of Protists • Protist classification will likely change. – Some protists are not closely related. – Molecular evidence supports reclassification. *Those watching by recording include in your email why protists will likely be reclassified.
19. 2 Animal-like Protists KEY CONCEPT Animal-like protists are single-celled heterotrophs that can move.
19. 2 Animal-like Protists Animal-like protists move in various ways. • Animal-like protists are often called protozoa. macronucleus contractile vacuole food vacuole oral groove micronucleus cilia
19. 2 Animal-like Protists • Protozoa with flagella are zooflagellates. – flagella help zooflagellates swim – more than 2000 zooflagellates
19. 2 Animal-like Protists • Some protists move with pseudopods. What does pseudo mean again? – change shape as they move – amoebas
19. 2 Animal-like Protists • Some protists move with pseudopods. – change shape as they move – amoebas – foraminifera
19. 2 Animal-like Protists • Some protozoa move with cilia. – cilia help protists swim and capture food – more than 8000 ciliates macronucleus contractile vacuole food vacuole oral groove micronucleus cilia
19. 2 Animal-like Protists Some animal-like protists cause disease. • Protists cause some wellknown infectious diseases. • Malaria is caused by Plasmodium and spread by mosquitoes. • Sleeping sickness is caused by Trypanosoma and spread by flies. • A giardia infection is caused by Giardia and spread through water. human liver sporozoites liver cells developed parasites red blood cells Malaria Infection
19. 3 Plantlike Protists KEY CONCEPT Algae are plantlike protists.
19. 3 Plantlike Protists Plantlike protists can be single-celled or multicellular. • Photosynthetic plantlike protists are called algae. If it is photosynthetic, what can it do? colony daughter colony *Those watching by recording, include in your email the definition of an algae.
19. 3 Plantlike Protists • Euglenoids are a large group of plantlike protists. – mostly photosynthetic – some heterotrophic – which means? – single-celled pellicle contractile – one or two flagella vacuole nucleus flagellum chloroplast eye spot
19. 3 Plantlike Protists • Dinoflagellates are mostly marine plantlike protists. – have two flagella – may be bioluminescent –Which means? – have stiff protective plates – can cause red tide Dinoflagellates
19. 3 Plantlike Protists • Diatoms are plantlike protists with glasslike shells. – shells made of silica – produce large amounts of oxygen *Those watching by recording, include in your email one reason diatoms are important to the health of an environment.
19. 4 Funguslike Protists KEY CONCEPT Funguslike protists decompose organic matter.
19. 4 Funguslike Protists Slime molds and water molds are funguslike protists. • Slime molds have both funguslike and animallike traits. – decomposers, like fungi – can move, like animals
19. 4 Funguslike Protists • Slime molds can be plasmodial or cellular – if something is not cellular, what would it be like? – Plasmodial slime molds are giant cells with many nuclei. – Cellular slime molds contain independent cells. *Those watching by recording, include in your email the difference between plasmoidal and cellular slime molds.
19. 4 Funguslike Protists • Water molds are freshwater, funguslike protists. – one type of water mold caused Great Potato Famine of Ireland in the 1800’s – made of branching strands of cells – can be parasites of plants or fish
19. 4 Funguslike Protists Quiz Answer Time Quiz 19 -1
19. 4 Funguslike Protists • • • 1. On what basis are protists divided into groups? A) According to how they move B) According to how they get their food C) According to their structures D) According to their habitat • Correct Answer = B • • • 3. Which protist group is made up of decomposers? A) Funguslike protists B) Plantlike protists C) Colonial protists D) Animal-like protists • Correct Answer = A
19. 4 Funguslike Protists • • • 5. One major characteristic shared by all protists is that they are all A) eukaryotes. B) prokaryotes. C) only unicellular. D) only multicellular Correct Answer = A
Review • Protists can be animal-like, plant-like, or fungus-like • Protists are difficult to classify and are likely to be reclassified due to current molecular evidence • Animal-like protists can move using different structures including flagella, cilia, and pseudopods • Some protists cause disease • Plant-like protists include euglenoids, diatoms, and dinoflagellates • Fungus-like protists include slime molds and water molds.
Questions?
- Slides: 35