Lecture 19

Question 1

characteristics of clade bacteria

Answer 1

-have bilateral symmetry
-varying degrees of cephalization
-triploblastic

Question 2

What are Clade Lophotrochozoa

Answer 2

-range from very simple worms to complex octopuses
-include 18 phyla

Question 3

What are Phylum Platyhelminthes

Answer 3

-flatworms
-breath through their skin
-don’t have complete digestive system

Question 4

What are Endoparasites

Answer 4

A parasite that lives inside its host (ex. tapeworm)

no digestive system, absorb nutrients through thin body wall

Question 5

what are Proglottids

Answer 5

long unit chains on tape worms devoted to reproduction

Question 6

4 steps of the lifecycle of a tapeworm

Answer 6

1. eggs consumed by intermediate host (IH)
2. eggs develop into larvae that encyst in tissues of IH
3. intermediate host eaten by definitive host (DH)
4. larvae develop into adult tapeworm in gut of DH

Question 7

Define Definitive host and Intermediate host

Answer 7

Definitive host: parasite undergoes sexual reproduction

Intermediate host: parasite undergoes asexual reproduction

Question 8

Characteristics of Annelids (segmented worms)

Answer 8

1. Segmented
2. Eucoelomate
3. gas exchange via skin diffusion
4. have complete digestive system with anus

Question 9

What are sedentarias

Answer 9

sendentary=less mobile
-burrow in soil
-free spawning: egg & sperm released into water, fertilization occurs outside body of parent

Question 10

characteristics of earthworms

Answer 10

-simultaneous hermaphrodites
-transfer sperm by copulation
-fertilization is external
-direct development (no larval)