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BSC 109 - Module 2

by: Mina Lubel

BSC 109 - Module 2 BSC 109

Mina Lubel
GPA 3.25
Introductory Biology for Non-Majors II
Austin Hicks

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About this Document

Here is module 2 for the online biology class taught by Austin Hicks.
Introductory Biology for Non-Majors II
Austin Hicks
Study Guide
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This 2 page Study Guide was uploaded by Mina Lubel on Monday February 16, 2015. The Study Guide belongs to BSC 109 at University of Alabama - Tuscaloosa taught by Austin Hicks in Spring2015. Since its upload, it has received 95 views. For similar materials see Introductory Biology for Non-Majors II in Biology at University of Alabama - Tuscaloosa.


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Date Created: 02/16/15
Module 2 Assignment Name Mina Lubel Directions Answer the following questions Submit via Assignments in the Course Tools menu 1 What are two characteristics of complex multicellular organisms that distinguish them from simple multicellular organism Describe them The two characteristics of complex multicellular organisms that distinguish them from simple multicellular organisms are cell specialization and intercellular development Cell specialization is different cells using different genes making them develop in different ways Intercellular development is the adjustment of a cell s acivity in response to what other cells are doing 2 What is mycology The study of fungi 3 How are fungi different from plants Fungi are heterotrophs They do not produce their own food through photosynthesis Fungi have cell walls made of chitin unlike plants who have cell walls made of cellulose 4 Define the following a Hyphae A filament of a fungus b Septa A partition or crosswall such as those that divide fungal hyphae into cells c Mycelium In fungi a mass of hyphae 5 How do fungi obtain nutrients Fungi obtain nutrients through external digestion in which enzymes are secreted onto food The food is digested outside of the body and the nutrients are absorbed by the fungal cells Fungi can break down the cellulose which is why they are often found growing on trees 6 Describe the ecological and commercial roles of fungi Fungi plays a key role in the environment as decomposers Commercially yeast which is a singlecelled fungi that produce abundant quantities of ethanol and carbon dioxide is use to make beer and bread 7 How are the fungal phyla distinguished from each other They are distinguished primarily by their modes of sexual reproduction 8 Describe the different phyla of fungi There are five different phyla of fungi the zygomycetes the ascomycetes the basidiomycetes the chytridiomycetes and the imperfect fungi 10 ll 12 13 Zygomycetes are unique among the fungi in that the fusion of hyphae does not produce a heterokaryon a cell with two haploid nuclei Ascomycetes are the largest of the fungal phyla with about 32000 named species and many more being discovered every year Basidiomycetes contain the most familiar of the fungi among their 22000 named species the mushrooms toadstools puffballs and shelf fungi Chytridiomycetes are mostly aquatic organisms The imperfect fungi are fungi that have lost the ability to reproduce sexually Define the following a Zygosporangium a very effective survival mechanism a resting structure that allows the organism to remain dormant for long periods of time when conditons are not favorable b Ascocarp the larger structure that differentiates the ascomycetes that are named for their sexual reproductive structure the ascus within c Basdiocarp the mycelium forms of a complex structure made of dikaryotic hypae What characteristic places a fungi in the phyla imperfecti Sexual reproduction has not been observed most are thought to be ascomycetes that have lost the ability to reproduce sexually A lichen is the symbiotic relationship between two organisms Name the two organisms and what each contributes to the relationship The two organisms are a fungus and a photosynthetic partner The fungus contributes the ability to absorb minerals and other nutrients very effectively from the environment The photosynthetic partner contributes the ability to use sunlight to power the building of organic modules What are the main characteristics of lichens Produce their own food Moss like Bushlike or leafy What is mychorrhizae What is the difference between endomycorrhizae and ectomycorrhizae Mychorrhizae is a symbolic relationship between fungi and plant roots Ectomycorrhizae is an association that take place on the surface of the roots Endomycorrhizae penetrate into the root cortex and form arbuscules within the roots Ectomycorrhizae fungi can reproduce themselves also in absence of a plant host However Endomycorrhizae fungi only reproduce themselves when in the presence of a host plant


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