Lecture 30 - Invertebrates I Flashcards Preview

BISC 120 > Lecture 30 - Invertebrates I > Flashcards

Flashcards in Lecture 30 - Invertebrates I Deck (24):
1

What is evo-devo?

study of evolutionary developmental biology

2

What are the 2 aspects of the Genetic Theory of Morphological Evolution?

1. Morphological diversity evolves through alterations in functionally conserved proteins
2. Changes occur through mutations in promoter sequences of regulatory genes + their target genes that participate in developmental pathways

3

What is a transcription factor?

protein that binds to specific sequences in the promoter of a gene

4

What does a transcription factor do?

o Controls transcription of genetic info from DNA to RNA

5

3 Classes of Phylum Porifera

(sponges)
1. Glass
2. Demosponges
3. Calcareous

6

How do Phylum Porifera eat?

-Suspension feeders
-Choanocytes line spongocoel to trap food in collars

7

What kind of reproductive system do Phylum Porifera have?

-Sequential hermaphrodites
(Individuals produce both sperm + eggs)

8

(Phylum Porifera) Where do gametes arise?

-choanocytes or amoebocytes

9

(Phylum Porifera) 3 steps of reproduction

1. Eggs are typically retained, sperm carried out osculum by water current
2. Sperm drawn into neighboring individuals
3. fertilize eggs in mesophyll

10

Sponges are capable of extensive ________

regeneration (replacement of lost parts)

11

(Phylum Porifera) Defense

Sponges produce variety of bioactive metabolites (antibiotics)

12

(Phylum Porifera) What cells could be rudimentary sensory organs?

-Globular cells may represent rudimentary sensory organs
-Metazoans were already in possession of proto-neural cells

13

4 classes of Phylum Cnidaria

1. Hydrozoa
2. skypozoa
3. cubizoa
4. anthozoa

14

(Phylum Cnidaria) basic body plan

-sac with central digestive compartment (gastrovascular cavity)
-single opening to cavity functions as both mouth and anus

15

(Phylum Cnidaria) What are the two variations in body plans?

1. Polyp (sessile)
2. Medusa (floating jellies)

16

What are 3 characteristics of Polyp?

1. Cylindrical, adhere to substratum by aboral end
2. Extend tentacles
3. Wait for prey

17

What are 2 characteristics of Medusa?

1. Flattened, inverted versions of polyps
2. Drift passively by contracting bell-shaped body

18

Must Phylum Cnidaria exist as either polyp or medusa?

-some exist as polyps
-some exist as medusas
-others pass sequentially through both stages in life cycle

19

How do phylum cnidaria eat?

-Cnidocytes on tentacles for defense/prey-capture
-carnivores

20

What are nomatocystes?

inject poison into pretty after chemo-mechano stimulation

21

How does symbiosis work between phylum cnidaria and anemone work?

-mutual symbiosis
-Fish defends host, uneaten food/feces feed anemone
-Avoids being stung via sugar-based mucous coating

22

Epidermal + gastrodermal cells have ______________

contractile fibers of bundled microfilaments

23

Where did true muscles appear first?

triploblastic animals

24

(Phylum Cnidaria) How are movements controlled?

-non-centralized nerve net
-Associated with simple, radially distributed sensory receptors