Biomaterials (Lichtenegger)- exam questions of June 2014

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Hofi
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Registriert: 07.11.2010, 11:23

Biomaterials (Lichtenegger)- exam questions of June 2014

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04.06.2014:
Special thanks to all the people from Facebook which collaborated to create this first list of questions from their exam:

-collagen:
1. primary, secondary and tertiary structures
2. sketch the staggered structure and where does mineralization occures?
-wood:
1. macro-, micro-, nano- structures
2. principal components
3. wood stiffer in compression or tension?
-insect cuticle
1. differents composites and their arrangement
2. ??
-cartilage:
1. what does it contains?
2. describe briefely the structure
3. bone/cartilage interface: strategies to prevent from delamination
4. damping mechanism
-collagen/keratin:
1. ability to recognize molecules
2. interaction that assemble the superhelices
-resilin/hair keratin:
1. ability to recognize the stress-strain diagram
2. resilin: protein or polysaccharide? Where does it occure?
control mechanisms in biomineralzation

chemical, structural, morphological, spatial...

was ist tanning?
zwei varianten die bei insekten statt finden

zwei stress-strain kurven waren aufgezeichnet, sagen was was ist
zwei beispiele fuer biomineralization nennen


17.06.2014:
Here I forgot some, but the questions had been of the same type. Those I remembered are written underneath

Given is the structure of cysteine and glycogen. Name where it occurs.
(hair keratin, collagen)

Stress- strain diagram for keratin at different humidities. Tell which one is high hydration, which one is low. Also explain why it has those three significant intersections.

What is silk? Where does it occur? Does different types of spider silk?

Name the four bases for DNA. What does DNA contain too?
Explain the process of protein syntheses. At which organel does it happens?

Role of glycogen in the binding of collagen?

Why is aragonite stable in Nagre and doesn`t transform in calcite?
Name at least 4 mechanisms in Nagre that help to increase it`s toughness.

Bone is stronger in _____ then _______ then ___________ (compr, tension, shear).

Effect of mineralization on the toughness, strength and maximal strain?

Structural elements in wood?
How does the MFA influences the mechanical properties of wood? What is the MFA?

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