HW #31 - AP Biology Period 4 #22 Liem Nguyen 2/6/10...

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AP Biology Period – 4 #22 Liem Nguyen 2/6/10 Homework #31 (090220): Chapter 31 (due Friday 090220 ) Total points: 40 for Attempt on all questions Concept Map: 10 Points Chapter 31: Fungi Objectives Introduction to the Fungi 1. List the characteristics that distinguish fungi from members of other multicellular kingdoms. they are heterotrophs digest food through exoenzymes act as decomposers Fungi are heterotrophs, thus opposing the characteristics of kingdom Plantae. Also, they digest food through exoenzymes by decomposing it, unlike those in kingdom Animalia. 2. Explain how fungi acquire their nutrients. have enzymes called exoenzymes decomposers of nonliving material break down and absorb nutrients Fungi have enzymes called exoenzymes which allow them to decompose nonliving material through food. This is because they are decomposers, which means that they acquire their energy through the break down and absorption of nutrients for food. 3. Describe the basic body plan of a fungus. hyphae (network of filaments) chitin (tubular cell walls) mycelium (surrounds/infiltrates material) Although fungi may seem small on the surface, the surface area they cover underground is immense. This is because most fungi have a network of filaments called hyphae, made up of tubular cell walls made up of chitin. Hyphae then form mycelium, which surrounds and infiltrates the material it feeds upon. 4. Describe the processes of plasmogamy and karyogamy in fungi. plasmogamy (combining of two parent mycelia) karyogamy (fusing of haploid nuclei) plasmogamy (haploid, then heterokaryotic) karyogamy (diploid) In plasmogamy, the cytoplasm of two parent mycelia combine. However, the nuclei may not fuse right away, making the mycelium a heterokayon. Eventually, the haploid nuclei fuse in karyogamy, producing diploid cells. Zygotes nd other
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transient structures form, then meiosis occurs and the new haploid cells are dispersed. 5. Explain the significance of heterokaryotic stages in fungal life cycles. advantages of diploidy compensate for harmful mutations cancel out other gene Heterokaryotic stages allow the fungus to benefit from the advantages of a diploidy condition, in that one haploid genome may be able to compensate for harmful mutations in the other. Diversity of Fungi 6. Describe the evidence that suggests that Fungi and Animalia are sister kingdoms.
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This note was uploaded on 11/06/2011 for the course AP BIO 101 taught by Professor Chan during the Fall '05 term at JFK.

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HW #31 - AP Biology Period 4 #22 Liem Nguyen 2/6/10...

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