Teeth & Skeleton Lab

Question 1

Teeth probably evolved from ____

Answer 1

denticles

Question 2

Lamprey analogs to teeth

Answer 2

keratinized structures analogous in function to vertebrate teeth, but lacking enamel and an underlying dentin layer

Question 3

___ anchors teeth to the skin of cartilaginous fish like the shark.

Answer 3

collagen

Question 4

thecodont dentition

Answer 4

teeth in sockets in the jaw; all mammals have this

Question 5

acrodont dentition

Answer 5

teeth rest on the surface of the jaw; fish, amphibians, reptiles

Question 6

pleurodont dentition

Answer 6

broadly attached to the jaw on its rim and inner wall; fish, amphibians, reptiles

Question 7

teeth are all the same shape, as in the dogfish and alligator

Answer 7

homodont

Question 8

different tooth shapes, like in mammals

Answer 8

heterodont

Question 9

teeth in sockets in the jaw

Answer 9

thecodont

Question 10

teeth rest on the surface of the jaw

Answer 10

acrodont

Question 11

teeth broadly attached to the jaw on its rim and inner wall

Answer 11

pleurodont

Question 12

order of teeth in dental formula

Answer 12

incisors, canines, premolars, molars

Question 13

Rodent incisors experience __ growth.

Answer 13

continuous

Question 14

Rodents and many herbivores lack ___ and some _____.

Answer 14

canines

premolars

Question 15

premolars modified for cutting meat from prey

Answer 15

secodont

Question 16

carnassial pair

Answer 16

carnivore’s pair of secodont teeth

Question 17

mammal molars that are low blunt cusps covered with enamel

Answer 17

bunodont

Question 18

ungulate tooth shape

Answer 18

selenodont

Question 19

elephant tooth shape with enamel folds running between areas of dentin

Answer 19

lophodont

Question 20

areas of exposed ____ wear faster than ___ areas

Answer 20

dentin

enamel

Question 21

diphyodont

Answer 21

grow two sets of teeth

Question 22

monophyodont

Answer 22

one set of teeth, lose them and no replacements

Question 23

polyphyodont

Answer 23

lose teeth and repeatedly replace them; most non-mammalian vertebrates

Question 24

skeletons are divided into ___ and ____ components

Answer 24

axial

appendicular

Question 25

Which part of the skeleton includes the pectoral and pelvic girdles?

Answer 25

appendicular

Question 26

Later tetrapods evolved limb placement under their bodies, so that each step required __force to move forward . As a result, adductor muscle size ____, and the range of motion of the scapulae _____. The femur and humerus also rotated,

Answer 26

less decreased increased

Question 27

What decreased head jarring in the evolution of tetrapods?

Answer 27

the head was no longer connected to the pectoral girdle

Question 28

first two cervical vertebrae in mammal

Answer 28

atlas and axis

Question 29

The___ abuts with the occipital condoyle, protecting the spinal cord

Answer 29

atlas