AS Biology P1 MCQs Preparation Thread

[Nibz]

oops sorry...i saw it wrongly and i thought the correct option had a no for cellwall sorryyy

Drink a cup of coffee or something. You have your paper in an hour.

 

[Jaf]

Aoa wr wb!

isnt cell wall present throughout? ..

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Nibz Irfan1995

I don't see what is confusing you. They are also saying that the cell wall is present. What is confusing me is that they are saying there are no centrioles???? During metaphase, the centrioles are the one which produce the spindle fibres, no?

hi can anyone please help
from 2008 Mayjune q. 35
please explain !!!!!!!!

35 Which disease is treated with drugs that have a similar molecular structure to DNA nucleotides?

A cholera
B HIV / AIDS
C malaria
D tuberculosis (TB)

It's HIV. Mary Jones give an example of Zidovudine and says, "(e.g. zidovudine is similar to the nucleotide that contains the base thymine). Zidovudine binds to the viral enzyme reverse transcriptase and blocks its action. This stops the replication of the viral genetic material and leads to an increase in some of the body's lymphocytes."

 

[Nibz]

I don't see what is confusing you. They are also saying that the cell wall is present. What is confusing me is that they are saying there are no centrioles???? During metaphase, the centrioles are the one which produce the spindle fibres, no?

No, not in plant cells.

 

[XPFMember]

I don't see what is confusing you. They are also saying that the cell wall is present. What is confusing me is that they are saying there are no centrioles???? During metaphase, the centrioles are the one which produce the spindle fibres, no?



It's HIV. Mary Jones give an example of Zidovudine and says, "(e.g. zidovudine is similar to the nucleotide that contains the base thymine). Zidovudine binds to the viral enzyme reverse transcriptase and blocks its action. This stops the replication of the viral genetic material and leads to an increase in some of the body's lymphocytes."

plants do not contain centrioles i forgot that fact...and plus i mistakenly saw the wrong option...and thought that the correct answer states there's no cell wall..my mistake

 

[XPFMember]

just hope paper goes welll inshaAllah...
2 hours stilll ....

jazakAllah khairen @everyone for helping...

 

[Nibz]

It's gonna be a piece of cake. IA.

 

[XPFMember]

It's gonna be a piece of cake. IA.

inshaAllah

 

[XPFMember]

and there... Soldier313 probably started the paper may ALlah help her n make it easy for her...and everyone ofc aameen

 

[narutogirl]

Small question :3
what is the order of colors when doing the Benedict's test

 

[Nibz]

Small question :3
what is the order of colors when doing the Benedict's test

VIBGYOR. (colours in rainbow)
Violet - least
Red - most.

 

[Soldier313]

and there... Soldier313 probably started the paper may ALlah help her n make it easy for her...and everyone ofc aameen

thanx for your Du'as XPFMember Alahmdulillah am done with it

 

[Soldier313]

'Thread Unstickied'.

Thanx for 'Re-sticking' it

 

[sarasousou1996]

does haemoglobin have a higher affinity for oxygen or carbon dioxide?

 

[xyz!]

does haemoglobin have a higher affinity for oxygen or carbon dioxide?

CO2 i guess!

 

[rogue94]

does haemoglobin have a higher affinity for oxygen or carbon dioxide?

This is what Wikipedia says about HbCO2: When carbon dioxide binds to hemoglobin, carbaminohemoglobin is formed, lowering hemoglobin's affinity for oxygen via the Bohr effect Therefore, at low oxygen partial pressures and hight CO2 partial pressures, CO2 combines with Hb to give HbCO2 and this lowers Hb's affinity for O2. I guess CO2 does not directly have higher affinity for Hb, but it reduces Hb's affinity for O2.

 

[XPFMember]

thanx for your Du'as XPFMember Alahmdulillah am done with it

aoa wr wb! how was it...i found it easier than some of the hard recent papers

 

[Soldier313]

aoa wr wb! how was it...i found it easier than some of the hard recent papers

alhamdulillah it went well yea it ws better than previos yrs.....wat do u reckon the gt will be?

 

[The King XII]

This is what Wikipedia says about HbCO2: When carbon dioxide binds to hemoglobin, carbaminohemoglobin is formed, lowering hemoglobin's affinity for oxygen via the Bohr effect Therefore, at low oxygen partial pressures and hight CO2 partial pressures, CO2 combines with Hb to give HbCO2 and this lowers Hb's affinity for O2. I guess CO2 does not directly have higher affinity for Hb, but it reduces Hb's affinity for O2.

yeah and remember CO2 combined with Hb gives carbo-amino heamoglobin which is only 5 % transmitted in this form and most of the time heamoglobin is transporting oxygen so yeah answer was CO-->O2-->CO2

 

[Jaf]

^32+

 

[XPFMember]

alhamdulillah it went well yea it ws better than previos yrs.....wat do u reckon the gt will be?

since i didn't ddo many papers...and i got no idea of the previous gts....i cant predict it