BIOL 1030 Study Guide - Midterm Guide: Tube Feet, Chitin, Arthropod

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 1030
• Professor: Kevin G.Scott

Document Summary

Some nematodes also parasite plants and some are major pests and some parasite humans. Some are bene cial and some are not. Parasitic ones have a molecular toolkit that enables them to redirect cellular functions invading the immune system. Some of them can inject molecules to the plant which causes root cellular development therefore supplying nutrients to the parasite. Their diversity and success is related to their body plan. They are segmented, hard exoskeleton, and have jointed appendages. Lobopods are a species that is extinct which arthropods may have evolved from. Their body plan permits the division of labour among di erent body regions. They have two unusual hoxgenes, in uencing segmentation. Their evolution of their body segment was driven by changes in existing hoxgenes. Their body is covered by a cuticle, an exoskeleton constructed from layers of protein and polysaccharides chitin, can be thick and hard over some body parts and thin and exible over other.