HOW WAS BIOLOGY PAPER 11

[yazan1995]

so halophytes what did you rite????

what is that ? i forgot it

 

[marz_katy]

the plants growing near sea water..sea water as water potential of -2500....conditions wer..1..the root has more negative wp than sea water
2...the roots are able to accumilate salts n solute
3...stomata remains open all the tym

 

[marz_katy]

and i jst googled u wer correct about co and o2 same binding site and co2 alone

 

[yazan1995]

the plants growing near sea water..sea water as water potential of -2500....conditions wer..1..the root has more negative wp than sea water
2...the roots are able to accumilate salts n solute
3...stomata remains open all the tym

ohhh i forgot what was my answer. what is the correct answer though?

 

[marz_katy]

ohhh i forgot what was my answer. what is the correct answer though?

if i was sure about my ans being correct i wudnt ask u:$ i rote 1 and 2...any1 sure about ds ans?

 

[yazan1995]

what about the question which said where hydrogen bonds are necessary
cellulose water haemoglobin and glycogen

 

[marz_katy]

what about the question which said where hydrogen bonds are necessary
cellulose water haemoglobin and glycogen

cellose water and haemoglobin

 

[abdo ibrahim]

cellose water and haemoglobin

oh no cellulose water and glycogen cutie
hemoglobin depends on hydrophobic and hydrophilic interactions

 

[marz_katy]

oh no cellulose water and glycogen cutie
hemoglobin depends on hydrophobic and hydrophilic interactions

its a protein..for maintainig protein structure hydrogen bonding is must..

 

[yazan1995]

i choosed all except haemoglobin cause haemoglobin still has three more bonds ionic, disulfide and hydrophobic interactions while other compounds has only hydrogen bonds so it's necessary... i hope i'm correct...

 

[abdo ibrahim]

its a protein..for maintainig protein structure hydrogen bonding is must..

oh btw you are right :$
glycogen doesnt need hydrogen bonds :/

 

[marz_katy]

u can say haemglobin is an exception :$
well glycogen for sure needs hydrogen bonds as well as cellulose and certainly H2O

u have mary jones book??? chk page no. 33 and 34...haemoglobin is quartenary protein u biliv that i hope...chk its ritten dat quartenery protein nids all the 4 bonds as tertiary but associates with more than 1 polypeptide chain...and glygogen doest form hydrogen form..u knw y? cz its a storage cmpd..it is stable and compact and insoluble....so it dsnt foem hydrogen bond with water

 

[marz_katy]

oh btw you are right :$
glycogen doesnt need hydrogen bonds :/

sorryyyyy i dint c dat so i xplaind u

 

[yazan1995]

this paper was so tricky ! what do you guys think of the GT ?

 

[Mohamed123456789]

i guess the GT will be around 26-28

 

[marz_katy]

yeaa tricky i agree bt fr bio gt is usually 35 34 33 i nevr saw in 20s:/

 

[yazan1995]

yeaa tricky i agree bt fr bio gt is usually 35 34 33 i nevr saw in 20s:/

it was the lowest in nov 2011 12 and A was 27

 

[jose machado]

marz katy it makes sense to be all 3 for the halophyte: Keep stomata open constantly open to provide the gradient and a rootss to accumulate salts to lower the potential!

 

[marz_katy]

marz katy it makes sense to be all 3 for the halophyte: Keep stomata open constantly open to provide the gradient and a rootss to accumulate salts to lower the potential!

http://www.tutorvista.com/content/b...ronment/ecological-adaptations-halophytes.php....................chk ds out..it says dey have adaptation same as xerophytes...they hv sunken stomata to avoid transpiration..wch clearly shws stomata shud be closed...hope i make sense=)

 

[jose machado]

well i ur right =)