OCR Biology F212 (Molecules, Biodiversity, Food and Health)- 21st May 2012

Triglyceride
- has a glycerol bonded to three lipids through a condensation reaction forming an ester bond in which a three water molecules are released
-a polysaccharide can be converted into a disaccharide through hydrolysis in which a water molecule is used to break a glycosidic bond, catalyst required
-mRNA only forms one strand which I complimentary to the template dstrand but similar to the coding strand( uracil replaces thymine)
- MRNA only code for one gene to form a proteiN in the ribosomes where as DNA provides full instructions... Don't know the rest of the sentence lol

How many ester bonds does a phospholipid molecule have?

Hi can anyone explain this spec point: 'Describe the structure and mode of B lymphocytes and T lymphocytes, including the significance of cell sigalling and the role of memory cells.

Much appreciated, do use this is gona come up???

Thanks in advanced

4/4
3/3
1/3 - Uracil instead of Thymine was right but mention deoxyribose/ribose, helical/non-helical, single stranded/double stranded
1/2 - Your mRNA part was right, just had to say the opposite for DNA, it has many genes to code for many proteins

why 1/3 i should get 2 marks and enzyme as well are needed mentions in the book

I was looking more at Glycosidic bond and water molecules inserted but if your book says enzyme then fair enough, don't remember my Bio book mentioning that...

Explain the advantages and disadvantages of ex situ [6]

Explain the advantages and disadvantages of ex situ [6]

its the OCR text book
but anyways can i have more

Advantage
they are in their own environment
- are able to breed more freely
- less suscptible to disease
disadvantage
-hunting
-tourism throwing litters which can reduce biodiveristy/gene pool
-competition of food between species

The question was on about EX-situ not IN-situ

Advantage
they are in their own environment
- are able to breed more freely
- less suscptible to disease
disadvantage
-hunting
-tourism throwing litters which can reduce biodiveristy/gene pool
-competition of food between species

Pros
- No risk of competition
- Health can be checked and maintained
- Good food supply
- Protection from poachers and predators

Cons
- Lose ability to integrate with wild animals
- Some animals cannot breed in captivity

I think you mixed up in situ and ex situ though it would havE been right for the advantages of In situ

is phagocytosis a primary or secondary response?

Spot on 6/6

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