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

Original post by Sarabande

That's what malnutrition is... a deficiency or oversufficiency in your diet.

oh ok then so any thing ya. Like anemia, rickets, night blindness etc.

Reply 782

Sarabande

15

Name 4 characteristics associated with Fungi (4)

How does speciation occur? (5) QWC

What is variation? (2)

Reply 783

username854791

OP

Original post by AS01

you have to be specific here. Mention about how it cannot make T killer cells, B cells or memory cells. No effector B cells so no antibodies formed.

Does HIV only effect the T-helper?

Reply 784

Original post by AS01

I should have given you the marks. I am sorry to say this but the one about opportunistic infection does not worth any mark even if it was for a mark.

but i am sure is right cause u said the effect if no t helper cells and if i remeber correctly from the book saying can cause opportunistic infections on page 163

Reply 785

Original post by Future_Dr

Does HIV only effect the T-helper?

ya it does because its the only cell that initiates immune response so it attacks the main component. really cruel of it :biggrin:

Reply 786

Original post by Sarabande

Name 4 characteristics associated with Fungi (4)

How does speciation occur? (5) QWC

What is variation? (2)

1) - walls made of chitin
- consisits of mycleium hyphae
- eukaryotes
- breakdown dead organic matters digests them

2) geographical isolation
-separation
-allopatric
-sympatric
-mutation
- reproductive barrier
3) differences within species

Reply 787

username854791

OP

Original post by Sarabande

Name 4 characteristics associated with Fungi (4)

How does speciation occur? (5) QWC

What is variation? (2)

Four characteristic of fungi are that they are eukaryotic, they have cell walls made of chitin, are hetrotrophic and often have flagellem.

Speciation- is that when a species is seperated and becomes a different species? Is it to do with evolution?

Variation occurs between individuals of the same species due to both genetic or enviromental?

Reply 788

Original post by otrivine

but i am sure is right cause u said the effect if no t helper cells and if i remeber correctly from the book saying can cause opportunistic infections on page 163

Oh fine then. This question was from a paper and it did not mention anything about that point so just saying. Better to keep it as your backup point rather than one of the main point. :biggrin:

Reply 789

username854791

OP

Original post by otrivine

but i am sure is right cause u said the effect if no t helper cells and if i remeber correctly from the book saying can cause opportunistic infections on page 163

which book is that?

Reply 790

Original post by AS01

Oh fine then. This question was from a paper and it did not mention anything about that point so just saying. Better to keep it as your backup point rather than one of the main point. :biggrin:

ok

thanks
Give the role of macrophages(3)

Reply 791

aisha302

does anyone have any guesses to what might come up? did it in jan and there was nothing on enzymess ergh!

Reply 792

Original post by Future_Dr

which book is that?

the ocr text book

Reply 793

Sarabande

15

Original post by otrivine

1) - walls made of chitin
- consisits of mycleium hyphae
- eukaryotes
- breakdown dead organic matters digests them

2) geographical isolation
-separation
-allopatric
-sympatric
-mutation
- reproductive barrier
3) differences within species

1. 4/4. The word for breaking down dead organic matter is saprophytic.

2. 4/5. You got the QWC for spelling sympatric and allopatric correctly. You didn't mention that there are different selection pressures for the species and they diverge into new species.

3. 1/2. It was 2 marks. Differences in genes and physical appearance within a species.

Reply 794

arvin_infinity

3

Guys do we do "primary succession" on this unit? or am just confusing this with unit 5

Reply 795

Original post by Sarabande

1. 4/4. The word for breaking down dead organic matter is saprophytic.

2. 4/5. You got the QWC for spelling sympatric and allopatric correctly. You didn't mention that there are different selection pressures for the species and they diverge into new species.

3. 1/2. It was 2 marks. Differences in genes and physical appearance within a species.

for part 3 i should get 2 marks cause my definition is exactly the same as that in the jan 2012 paper

Reply 796

Sarabande

15

Original post by Future_Dr

Four characteristic of fungi are that they are eukaryotic, they have cell walls made of chitin, are hetrotrophic and often have flagellem.

Speciation- is that when a species is seperated and becomes a different species? Is it to do with evolution?

Variation occurs between individuals of the same species due to both genetic or enviromental?

1. 3/4. Fungi are heterotrophic (better to say they are saprophytic) and they do not have flagella (they have hyphae)

2. 1/5. Yes it is to do with evolution xD. Read otrivine's answer.

3. 2/2

edit: heterotrophic is correct

(edited 11 years ago)

Reply 797