AS LEVEL BIOLOGY... discuss here AS students only :)

[HubbaBubba]

what is da syllabus in short ........ anyone plz help???

What do you mean what's in the syllabus? Anything in the syllabus is in the syllabus

 

[daredevil]

what is da syllabus in short ........ anyone plz help???

Cell Structure and function
Enzymes
Biological Molecules
Plasma Memberane
Transport in Plants
Transport in Humans
Human Heart Jinkglex
Nuclear and Cell Division
Gaseous Exchange
Infectious Diseases
Ecology
Immnity


i think thats about it =)

 

[MÁťT PŭמҚ]

guys can someone pls give me the link to mary jones revision guide AS bio?

http://studyguide.pk/?p=431

 

[Jinkglex]

you missed human heart which is a seperate chapter for some reason.

Cell Structure and function
Enzymes
Biological Molecules
Plasma Memberane
Transport in Plants
Transport in Humans
Nuclear and Cell Division
Gaseous Exchange
Infectious Diseases
Ecology
Immnity


i think thats about it =)

 

[MÁťT PŭמҚ]

Cell Structure and function
Enzymes
Biological Molecules
Plasma Memberane
Transport in Plants
Transport in Humans
Nuclear and Cell Division
Gaseous Exchange
Infectious Diseases
Ecology
Immnity


i think thats about it =)

and genetic control.. ryt??

 

[daredevil]

you missed human heart which is a seperate chapter for some reason.

really?? :O well i thought it was a part of transport in humans but wth i'll add that now

 

[daredevil]

and genetic control.. ryt??

uhh i'm not sure wat u're talking about but if its immunity then sure yeah i'll add that too

 

[MÁťT PŭמҚ]

uhh i'm not sure wat u're talking about but if its immunity then sure yeah i'll add that too

naah.. its abt Dna replication,transalion and transcription stuff..!!

 

[HubbaBubba]

What do you guys think will come up in the exam this session?

 

[MÁťT PŭמҚ]

an sm1 plz tell me tht y there is a need for transport systems in multi cellular plants and animal in terms of size and surface area to volume ratio...? :s

 

[MÁťT PŭמҚ]

What do you guys think will come up in the exam this session?

immunity i guess..

 

[HubbaBubba]

an sm1 plz tell me tht y there is a need for transport systems in multi cellular plants and animal in terms of size and surface area to volume ratio...? :s

Multicellular plants and animals have a larger volume compared to their surface area, so simple diffusion would not be enough to transport nutrients, gases around the body, because since distance is too large, the process is too slow. That's why animals have blood circulatory systems while plants have a xylem/phloem

 

[MÁťT PŭמҚ]

Multicellular plants and animals have a larger volume compared to their surface area, so simple diffusion would not be enough to transport nutrients, gases around the body, because since distance is too large, the process is too slow. That's why animals have blood circulatory systems while plants have a xylem/phloem

thnkx..

 

[daredevil]

naah.. its abt Dna replication,transalion and transcription stuff..!!

yeah its in the nucleear and cell division chap

 

[MÁťT PŭמҚ]

yeah its in the nucleear and cell division chap

yeah ryt..

 

[MÁťT PŭמҚ]

explain the role of pre-capillary sphinchter muscles?? :/

 

[Mariam Mohamed SX132]

can someone explain the role of tRNa in protein synthesis?

 

[daredevil]

explain the role of pre-capillary sphinchter muscles?? :/

sphinter muscles basically contract and realax to control an opening. precapillary means that before the start of a capillary these muscles are found. so thees muscles must be to open or close the capillary openings wen needed. Although i don't get why they would be opnening or closing bcz transfer is through the walls of the capillar

 

[daredevil]

can someone explain the role of tRNa in protein synthesis?

wen the mRNA brings out the tempelate from the nucleus to the RER the next step os to make another template mirroring that one. making dna is protein synthesis basically. first a ribosome attaches to the mRNA then the tRNA comes in and starts attacthing itself as per complementary base pairs. the tRNA have an amino acid at the end opposite to their anticodon end.... as more and more tRNA get involved the amino acids on them get linked up along the way making a polypeptide chain which eventually makes up the DNA

 

[Irfan1995]

yes to deoxyibose and ribose but the bases i don't think so. just know that A and G have a double ring structure with one double bond in each ring and the uracil, thyamine and cytosine have single rings with 2 double bonds each. and yes know that G and C hav triple bond whiile A and T or U have double bonds.

There's one crucial mistake:
The bond between G and C is NOT a triple bond. It's three different HYDROGEN bonds. Same goes for the bonds between A and T/U.