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Description
Flashcards by jennabarnes12387, updated more than 1 year ago
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Created by jennabarnes12387
over 10 years ago
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| Question | Answer |
| If larger cells function easier why aren't all cells large? | Larges cells take longer to bring in raw materials, dispose of wastes and use up more material. a large group of small cells doing the same job with work faster and use less resources then one large cell |
| What was the benefits for Autotrophs to become multicellular? | it optimized their ability to grow and reproduce by using specializing cells |
| Why did heterotrophs benefit from becoming multicellular? | this allowed them to be bigger in size so they had more the prey and we less likely to become prey |
| What is a downside to being a large multicellular organism? | The gestation period is longer in reproduction. the animal has to stay alive long enough to reproduce even if it takes years |
| What is the syntactical model? | explains how cell specialization results in interdependence to retain a single organism. it starts with precursor cells which have more then one nucleus. also precursors can be ciliated protozoans. as these cells starts to divide they form a semi-connected group called a syncytium which is all the multinuclei cells that haven't specialized yet |
| What is radical symmetry? | when a cell can be divided into many equal parts |
| What is bilateral symmetry? | a cell that can only be divided into two different parts |
| What is the colonial model? | similar to the syncial model but a better description. Describes how similar cells end up close to each other and then start to specialize. they then become interdependent and start to form a multicellular organism |
| how did mutlicellularism start in plants? | began in photosynthetic algae called chlorophytas. it increased there ability to create healthy and fertile gametes and be more productive as a group |
| Where did multicellularism start in animals? | the earliest know start was with sea sponges. instead of complicated tissues the animals have a simple filtering system for food and a small number of specialized cells |
| What are the three eras that we will mostly be studying? | Cenozoic, Mesozoic, and Paleozoic |
| When was the Cambrian period? why is it important? | 542-438 billion years ago. when most early multicellular organisms started to develop |
| What is Lagerstatten? | a German word used in palaeontology to describe a site with particularly good fossil preservation |
| What are the characteristics of a well preserved site? | areas where there were high temperatures, rapid sediment cover, no reworking currents so the fossils stay protected, little or no alteration after burial, and a diversity of different species. |
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