Polyhydroxyalkanoate

1.Which one is not correct?

• PHA is polyhydroxyalkanoate.

• PHA consists of 2-hydroxy fatty acid monomer.

• PHA is intracellular storage material produced by bacteria.

• PHA is polyester.

2.Which one is not the condition for biosynthesis of PHA?

• Excess of carbon

• Aerobic bacteria

• Excess of essential nutrient

• Anaerobic bacteria

3.What is the result of increasing hydroxyvalerate?

• Increased Tm

• Decrease Tm

• None of these

• All of these

4.Which one is not factor affecting PHA content & its composition?

• strain of microorganism

• type of substrate

• concentration of substrate

• None of these

5.Which one is not correct for long side chain PHAs?

• Bacterial PHA with R group larger than C2

• It is produce from Pseudomonas olevorans.

• High crystallinity

• All of these

6.Which one is not disadvantages of solvent extraction method?

• Costly

• toxic of solvent

• use large amount of solvent

• use long time process

7.Which one is not correct for chemical digestion by solution hypochlorite?

• chemical method

• chain scission

• high alkalinity

• environmental friendly

8.Which one is correct?

• PHB is higher solvent resistance than PP.

• PHB is flexible than PP.

• PHB is better UV radiation than PP.

• PET has higher gas barrier than PHB.

9.Which method is not used to improve mechanical properties of PHB?

• increasing of HV

• incorporation of HV in PHB

• hot rolling treatment

• none of these

10.Which is not properties of PHA?

• biocompatibility

• thermoset

• bidegradability

• piezoelectricity