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OCR Biology F212 Revision [3rd June 2013] (Now Closed)

Reply 640

Gotzz

13

Original post by kited4

Also In Situ can reduce genetic diversity due to inbreeding therefore increase vulnerability to disease...

Surely that'd be ex situ?

Reply 641

Ché.

Original post by lauren1brown

Does this reduce the gene pool?

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In respect to one another, they are considered the same incentive.
The mark schemes always put "genetic variation/gene pool" - so yes!
:biggrin:

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Reply 642

kited4

Original post by Gotzz

Surely that'd be ex situ?

yes sorry :P Ive been revising since 9am as i have 3 exams next week! my brain is frazzling! Think it's time to stop :rolleyes:

Reply 643

lauren1brown

Original post by Ché.

In respect to one another, they are considered the same incentive.
The mark schemes always put "genetic variation/gene pool" - so yes!
:biggrin:

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Ah great thanks :smile:

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Reply 644

Hello...

Original post by Gotzz

Surely that'd be ex situ?

Yeah Ex Situ is out of the species normal environment, in the case of an animal it would be in captivity, therfore less individuals, gene pool dramatically reduced by this fact alone, interbreeding also will take place through the generations
All the individuals in captivity could be susceptible to the same particular disease, no resistance to the disease means the captive animals will be wiped out (the disease will also spread a lot faster if in a confined space)

Reply 645

lauren1brown

What's the difference between a pathogen and parasite ?

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Reply 646

Priya08

Original post by lauren1brown

What's the difference between a pathogen and parasite ?

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A pathogen causes a disease
A parasite lives on an organism e.g headlice

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Reply 647

own

Original post by lauren1brown

What's the difference between a pathogen and parasite ?

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Pathogens are disease causing organisms
Parasites are organisms which live in or on another livining organism causing harm to its host
Parasites sometimes have pathogens in them

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Reply 648

zoep23

Original post by lauren1brown

What's the difference between a pathogen and parasite ?

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a pathogen is an organism that causes disease
a parasite is an organism that lives in or on another living thing, causing harm from its host. A parasite usually benefits from this relationship as the host provides shelter, warmth and a means of transmission to another host :smile:

Reply 649

coco_madem0iselle

9

Original post by lauren1brown

What's the difference between a pathogen and parasite ?

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also
parasites benefit from the host e.g gets nutrition, warmth, safety

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Reply 650

lauren1brown

Thanks everyone :smile:

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Reply 651

wilkes14

What to we need to know about the division in to Bacteria and Archaea?

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Reply 652

Ché.

Original post by wilkes14

What to we need to know about the division in to Bacteria and Archaea?

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In terms of the classification systems? :biggrin:

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Reply 653

jamesmact

3

Original post by R1C3W1N3

Any help with the immune response, please?

And I've gone through every exam, labelling all the questions about their subject and unit.
So you can almost "predict" what might come up in Mondays exam

That's so helpful, thanks

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Reply 654

wilkes14

Original post by Ché.

In terms of the classification systems? :biggrin:

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Yeah!

bit confused by the whole topic tbh :|

Reply 655

tssf_skye

15

Can someone explain the structures of Starch and Glycogen to me.. I don't seem to know too much.
Is this correct, and is there anything else I need to know?

Starch:
- a-glucose
- Made from Amylose and Amylopectin. Amylose is straight chained with 1,4 glycosidic bonds and Amylopectin is branched with 1,4 and 1,4 glycosidic bonds. So overall it's branched? or?
- Both are found in starch grains in chloroplasts and in amyloplasts in plants.
- Both are an energy store in plants
- Not soluble in water and therefore do not affect the water potential of the cell

Glycogen:
- a-glucose
- 1,4 and 1,6 glycosidic bonds - branched
- Energy store in animals
- Granules are found in animal cells such as liver and muscle
- Again, is not soluble in water - does not affect water potential of the cell.

I came across a question that asked why glycogen makes a good storage molecule (3) How would you answer this? Thanks!

Reply 656

kited4

Original post by tssf_skye

Can someone explain the structures of Starch and Glycogen to me.. I don't seem to know too much.
Is this correct, and is there anything else I need to know?

Starch:
- a-glucose
- Made from Amylose and Amylopectin. Amylose is straight chained with 1,4 glycosidic bonds and Amylopectin is branched with 1,4 and 1,4 glycosidic bonds. So overall it's branched? or?
- Both are found in starch grains in chloroplasts and in amyloplasts in plants.
- Both are an energy store in plants
- Not soluble in water and therefore do not affect the water potential of the cell

Glycogen:
- a-glucose
- 1,4 and 1,6 glycosidic bonds - branched
- Energy store in animals
- Granules are found in animal cells such as liver and muscle
- Again, is not soluble in water - does not affect water potential of the cell.

I came across a question that asked why glycogen makes a good storage molecule (3) How would you answer this? Thanks!

That's correct :biggrin:

Glycogen is a good storage molecule because:
It does not affect the water potential of the cell as it is insoluble
It is compact and can therefore store a lot of energy in the bonds
It is highly branched which facilitates enzyme action of hydrolysis of the glycogen into glucose for respiration

:smile:

Reply 657

Ché.

Original post by wilkes14

Yeah!

bit confused by the whole topic tbh :|

I am not quite sure what you want me to share exactly, but?
I can say what I know we need to know around the topic...

:biggrin:

- the main thing around distinguishing the systems are:
- The key differences between the (newly accepted) Domain system and the classical taxonomic hierarchy.

BINOMIAL CLASSIFICATION SYSTEM:
Taxonomy: - Illustrates the study of classification and where certain living organisms belong.
This is much more traditional in the sense that it is closely observed via Phylogeny - the evolutionary relationships and ancestral divergence between living organisms.

DOMAIN CLASSIFICATION SYSTEM:
- Relies on molecular and DNA evidence highly - the domains actually imply this, anyway.
- The lower hierarchy in this system stays the same - one of which is in the binomial system also.
- Proposed in the first instance due the new molecular evidence towards the taxonomic process.

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Reply 658

tssf_skye

15

Original post by wilkes14

What to we need to know about the division in to Bacteria and Archaea?

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I hate this topic, so much. However, I believe we just need to know that in 1990 the 3 domain system was proposed it was found out that the structure of Bacteria is fundamentally different to that of Archaea and Eukaryotae (this was based on detailed research into RNA).
Therefore the kingdom Prokaryotae was split into two groups: Archaea and Bacteria.

So bacteria shows differences e.g.
- It's cell membrane has a different structure
- It uses different enzymes for DNA replication and RNA building
- Has no proteins bound to its DNA

Reply 659

Ché.

Original post by Ché.

I am not quite sure what you want me to share exactly, but?
I can say what I know we need to know around the topic...

:biggrin:

- the main thing around distinguishing the systems are:
- The key differences between the (newly accepted) Domain system and the classical taxonomic hierarchy.

BINOMIAL CLASSIFICATION SYSTEM:
Taxonomy: - Illustrates the study of classification and where certain living organisms belong.
This is much more traditional in the sense that it is closely observed via Phylogeny - the evolutionary relationships and ancestral divergence between living organisms.

DOMAIN CLASSIFICATION SYSTEM:
- Relies on molecular and DNA evidence highly - the domains actually imply this, anyway.
- The lower hierarchy in this system stays the same - one of which is in the binomial system also.
- Proposed in the first instance due the new molecular evidence towards the taxonomic process.

- The membrane structure of the cells have varied structures;
- The usage of different enzymes for DNA replication;
- An absence of proteins that are attached to DNA strands.

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OCR Biology F212 Revision [3rd June 2013] (Now Closed)

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