AS Biology P1 MCQs Preparation Thread

[confused123]

i believe it's disulphide, hydrogen, ionic then hydrophobic, am not sure though

no dude, disulphide, ionic, hydrophobic interactions and then hydrogen bonds.

 

[Soldier313]

no dude, disulphide, ionic, hydrophobic interactions and then hydrogen bonds.

owhkay right sorry for the mess up......thanx for correcting....and it's dudette btw

 

[rana]

plz can any explain q no 1 nov/06

 

[XPFMember]

no dude, disulphide, ionic, hydrophobic interactions and then hydrogen bonds.

u take chem?
hydrogen bonds are definitely stronger than hydrophobic interactions....arent they?

 

[XPFMember]

plz can any explain q no 1 nov/06

AsSalamoALaikum Wr Wb!

​

 

[rana]

AsSalamoALaikum Wr Wb!

View attachment 12834​

JAZAK ALLAH KHARAN

 

[rana]

AsSalamoALaikum Wr Wb!

View attachment 12834​

0.2/80 * 1ooo *4 is ths way?

 

[XPFMember]

0.2/80 * 1ooo *4 is ths way?

yup thats correct too..
waeyyakum

 

[sarah.zarrar]

why is the answer to this 4? :S

 

[Soldier313]

Hope that helps

 

[Soldier313]

what is manufactured in the nucleus and what is manufactured in the nucleolus?

 

[sarah.zarrar]

thank you soo much!

 

[XPFMember]

what is manufactured in the nucleus and what is manufactured in the nucleolus?

i think...mRNA in the nucleus...ribosomes in the nucleolous

 

[Soldier313]

please can someone help

 

[geek101]

what is manufactured in the nucleus and what is manufactured in the nucleolus?

for us, mRNA in the nucleus and ribosomes in the nucleolus.

 

[Soldier313]

for us, mRNA in the nucleus and ribosomes in the nucleolus.

thanx so much

 

[Soldier313]

i think...mRNA in the nucleus...ribosomes in the nucleolous

thanx a lot

 

[Amaryllis]

it happens. read slowly n carefully each question. simple but effective tip. hope we can apply in exam 2

thanks for the advice yes ! the easy questions are confusing sometimes

 

[Irfan1995]

please can someone helpView attachment 12839

QRS represents ventricular systole, so P and T must be ventricular diastole

 

[Irfan1995]

u take chem?
hydrogen bonds are definitely stronger than hydrophobic interactions....arent they?

Disulphide is definitely the strongest, followed by ionic. As for hydrophobic and hydrogen bonds, that depends on the sequence of amino acids. A single hydrogen bond is very weak, so unless there are several of them, then it is the weakest. Hydrophobic interactions depend on the size of the R-groups. The bigger the group, the stronger the interactions are (they're basically instantaneous dipole-induced dipole interactions)