HELP: BIO question.

[svenas]

Q) Using examples, explain the relationship between structure and function for:
a) Fibrous proteins
b ) Globular proteins
c) Glycoproteins

 

[veiled_fantasy]

Q) Using examples, explain the relationship between structure and function for:
a) Fibrous proteins
b ) Globular proteins
c) Glycoproteins

a) Fibrous protein
Examples: Collagen, Keratin
Fibrous proteins are hydrophobic in nature hence they are insoluble in water. Secondary structure is most important in them. They play structural roles in the body.
b) Globular protein
Examples: Haemoglobin, Enzymes
Globular proteins are spherical in shape, with the hydrophilic amino acids on the outer surface, facing the aqueous environment and the hydrophobic amino acids in the interior. Tertiary srtucture is most important in them. They are soluble in water and have functional roles in the body.
c) Glycoprotein
Example: Immunoglobulins/Antibodies
Glycoproteins are conjugated molecules consisting of polypeptides attached to carbohydrate chains. Generally soluble in water. Have both functional (in the case of antibodies) and structural (in the case of the glycoproteins present in the cell surface membrane) roles in the body.

I've just given you a rough outline. A better answer would take one example from each one of these proteins and elaborate on their structures. I would recommend explaining the structures of collagen, haemoglobin and glycoproteins since they are included in the CIE A Level syllabus.

 

[svenas]

a) Fibrous protein
Examples: Collagen, Keratin
Fibrous proteins are hydrophobic in nature hence they are insoluble in water. Secondary structure is most important in them. They play structural roles in the body.
b) Globular protein
Examples: Haemoglobin, Enzymes
Globular proteins are spherical in shape, with the hydrophilic amino acids on the outer surface, facing the aqueous environment and the hydrophobic amino acids in the interior. Tertiary srtucture is most important in them. They are soluble in water and have functional roles in the body.
c) Glycoprotein
Example: Immunoglobulins/Antibodies
Glycoproteins are conjugated molecules consisting of polypeptides attached to carbohydrate chains. Generally soluble in water. Have both functional (in the case of antibodies) and structural (in the case of the glycoproteins present in the cell surface membrane) roles in the body.

I've just given you a rough outline. A better answer would take one example from each one of these proteins and elaborate on their structures. I would recommend explaining the structures of collagen, haemoglobin and glycoproteins since they are included in the CIE A Level syllabus.

Thx so much!

 

[veiled_fantasy]

Thx so much!

Glad I could help.

 

[svenas]

Glad I could help.

WHat sybjects u r taking in AS/A levels?
I actually take BIO PHY CHEM as AS and nxt yr I may complete A2

 

[veiled_fantasy]

WHat sybjects u r taking in AS/A levels?
I actually take BIO PHY CHEM as AS and nxt yr I may complete A2

I have completed my A levels in Biology, Physics, Chemistry and Maths.

 

[svenas]

I have completed my A levels in Biology, Physics, Chemistry and Maths.

and what was ur grades?

 

[veiled_fantasy]

and what was ur grades?

They were good enough, Alhamdulillah.

 

[svenas]

They were good enough, Alhamdulillah.

plz solve for me this question plzzz

 

[veiled_fantasy]

plz solve for me this question plzzz

Here you are.

 

[svenas]

Here you are.

Thx soooooooooooooooooooooooooooooo Much. Also this if u don't mind:

 

[svenas]

Here you are.

Bro thxxxxxxxxxxx so much ...keave last question I sent and solve this : q6 part cii, the calculation part.... http://www.edexcel.com/migrationdoc...m 2000/January 2009/6BI01_01_que_20090108.pdf

 

[veiled_fantasy]

Thx soooooooooooooooooooooooooooooo Much. Also this if u don't mind:

Glad I could help. Here is a simple labelled illustration of an artery.

 

[svenas]

Glad I could help. Here is a simple labelled illustration of an artery.

Hey u r so kind.....srry this was not my question. read previous post and c my question.
Thx

 

[veiled_fantasy]

Bro thxxxxxxxxxxx so much ...keave last question I sent and solve this : q6 part cii, the calculation part.... http://www.edexcel.com/migrationdocuments/QP GCE Curriculum 2000/January 2009/6BI01_01_que_20090108.pdf

Firstly, I am not a 'bro', dude.
And the calculations are as follows:

Using the graph, the Incidence of heart disease per 1ooo population for:
a) 75 yr old men= 420
b) 18-44 yr old men= 30

Difference= 420-30=390

Increased risk= 390/30=13

 

[svenas]

Firstly, I am not a 'bro', dude.
And the calculations are as follows:

Oh I'm sooooo srry, ok btw is it possible for me to find percentage increase also?
I apologize again!

 

[veiled_fantasy]

Oh I'm sooooo srry, ok btw is it possible for me to find percentage increase also?
I apologize again!

Lol. It's alright. To find the percentage increase, you just multiply 13 by 100.

 

[svenas]

Lol. It's alright. To find the percentage increase, you just multiply 13 by 100.

yea I knw but is it ok if I calculate % increase as the answer ryt?

 

[veiled_fantasy]

yea I knw but is it ok if I calculate % increase as the answer ryt?

I don't think so. They've only asked for the increased risk, so you shouldn't calculate the percentage increase. You should check out what they say in the Examiner Report though.

 

[svenas]

I don't think so. They've only asked for the increased risk, so you shouldn't calculate the percentage increase. You should check out what they say in the Examiner Report though.

aha u r ryt!
Thx for helping aloooooooooooooot, btw this question no body understood in my class haha...thx
If I hv more I 'll post them!