Structural Material 2

Question 1

Collagen is a protein used by many types of animals but mainly in _

Answer 1

Vertebrates

Question 2

A third of all human protein is

Answer 2

Collagen

Question 3

Several collagen molecules come together to form _

Answer 3

Twisted fibers

Question 4

Twisted fibers used to make strong but flexible _

Answer 4

Connective tissue

Question 5

Connective tissue such as (2)

Answer 5

Cartilage

Skin

Question 6

A fibrous protein _ is found in all kinds of animals

Answer 6

Keratin

Question 7

Keratin’s properties make it perfect for creating a _ coating on body (2)

Answer 7

Flexible

Waterproof

Question 8

Keratin found in skin, _ and _

Answer 8

Scales

Hair

Question 9

Keratin also in fingernails, _ and _

Answer 9

Claws

Horns

Question 10

Keratin also in hooves and _

Answer 10

Feathers

Question 11

Hydroxyapatite is a natural form of _

Answer 11

Calcium phosphate

Question 12

Hydroxyapatite is used in vertebrate (2)

Answer 12

Bones

Teeth

Question 13

Hydroxyapatite makes up about _ percent of human skeleton weight

Answer 13

70

Question 14

Tooth enamel which contains Hydroxyapatite is _

Answer 14

Hardest biological material

Question 15

Mollusks, crustaceans, and other shellfish are hardened by _

Answer 15

Aragonite

Question 16

Aragonite is a form of

Answer 16

Calcium carbonate

Question 17

Raw ingredients of aragonite are extracted form _

Answer 17

Seawater

Question 18

Sea shell made from layers of _

Answer 18

Tiny crystals

Question 19

Sponge is protected by microscopic spikes of

Answer 19

Silica

Question 20

Bodies of some _ are constructed from particles made from silica (2)

Answer 20

Sponges

Corals

Question 21

Silica is a glasslike substance, naturally occurring form of _

Answer 21

Silicone dioxide

Question 22

In hard skeletons and shells _ in spaces between cells provides strength

Answer 22

Solid crystals