Ls 1 Lecture May 21 Phylum Nematoda And Arthropoda I

Front 1

common characteristic between nematodes and artropods?

Back 1

cuticle that molts (ecdysis)

Front 2

ecdysozoa evolved independently?

Back 2

only evolved once

Front 3

nematode means

Back 3

thread

Front 4

what are the most abundant animals alive today

Back 4

roundworms (nematode)

Front 5

are nematodes segmented?

Back 5

no

Front 6

true or false: nematodes have a complete digestive tract

Back 6

true

Front 7

nematodes: coelomate, acoelomate, pseudocoelomate?

Back 7

mostly pseudocoelomate, few acoelomate

Front 8

how many times do nematodes molt

Back 8

4

Front 9

nematodes have longitudinal muscle only, therefore __________________ waves

Back 9

sinusoidal, alternating contractions of muscles on dorsal and ventral surfaces

Front 10

nematode locomotion is constrained by

Back 10

rigid cuticle
turgid (firm) body wall due to hydrostatic skeleton
no locomotory cilia
no circular muscles
no appendages

Front 11

how do nematodes grow?

Back 11

eutely, grow by increasing cell size, not cell number

Front 12

how are nematodes helpful in medicine (Nobel Prize in Physiology or Medicine)

Back 12

genetic regulation of organ devt. and programmed cell death

nematode starts with 1090 cells, 131 later eliminated, ends up with 959 cells

genetic basis for cell death may be key to control of certain diseasaes like AIDS or stroke (involve excessive cell death)

Front 13

arthropoda means

Back 13

jointed foot

Front 14

arthropods= percentage of all animal species

Back 14

75%

Front 15

successful arthropod characteristics

Back 15

chitinous exoskeleton
jointed appendages
striated muscle
segmentation and tagmatization (specialized groups of segments: head/thorax/abdomen)

Front 16

arthropod circulatory system: open/closed?

Back 16

open

Front 17

do arthropods have eyes?

Back 17

yes, compound image-forming eyes

Front 18

true or false: arthropods have motile cilia

Back 18

false, they lost it

Front 19

true or false: arthropods have no respiratory or excretory systems

Back 19

false, they have novel systems

Front 20

how are molluscs and arthropods similar?

Back 20

hard outer covering

Front 21

are molluscs and arthropods homologous?

Back 21

no
shell does not = exoskeleton

Front 22

how are annelids and arthropods similar?

Back 22

legs

Front 23

are annelids and arthropods homologous?

Back 23

no, parapodia does not = jointed appendages

Front 24

how are chordates and arthropods simlar?

Back 24

hard skeletons; functionally similar

Front 25

are chordates and arthropods homologous?

Back 25

chtin exoskeleton does not = CaCo3 endoskeleton

Front 26

how are nematodes and arthropods simlar?

Back 26

molting

Front 27

are nematodes and arthropods homologous?

Back 27

yes

Front 28

homologous

Back 28

derived from common ancestor

Front 29

molting steps

Back 29

epidermis secretes new soft cuticle under old hard cuticle

sheds old hard cuticle

Front 30

which is faster and more responsive: smooth muscle or striated muscle

Back 30

striated muscle: found in arthropods and vertebrates

Front 31

in arthropods, muscles attach to

Back 31

inner surface of outer skeleton

Front 32

in vertebrates, muscles attach to

Back 32

outer surface of inner skeleton

Front 33

crustaceans are biramous/uniramous

Back 33

biramous

Front 34

insects are biramous/uniramous

Back 34

uniramous

Front 35

arthropod wings are

Back 35

saclike outgrowth of body wall
sheets of chitin and protein

Front 36

how many pairs of wings do arthropods usually have

Back 36

2

Front 37

wing up
muscle contractions/relaxations

Back 37

tergum down
vertical muscles contract
longitudinal muscles relax

Front 38

wings down
muscle contractions/relaxations

Back 38

turgum up
longitudinal muscles contract
vertical muscles relax