AS Biology P1 MCQs Preparation Thread

[Soulgamer]

the reaction rate of salivary amylasr with starch decreases as the concentration of chloride ions reduced. which of the following describes the role of the chloride ions.
a) allosteric inhibitors
b) co factors
c) coenzymes
d) competitive inhibitors

the ans is co factors. i never read about it in the book.

It was in our O levels. Look it up.

 

[yazan1995]

LOL seriously? He can't!

He can if he have the book in the PDF form

 

[Soldier313]

Aoa wr wb! I personally would prefer solving 2011 backwards..starting with nov 2011
dunno what are all people up to..

P.S. Here's how you can manage your time preparing for Physics and/or Biology Paper:1 !

at least someone thinks like me

 

[confused123]

It was in our O levels. Look it up.

but this is an As level thread. don't talk about Olevels.

 

[Soulgamer]

but this is an As level thread. don't talk about Olevels.

So don't ask questions related to O levels? And even if you did so act upon what I just said rather than commenting like a buffoon.

 

[confused123]

So don't ask questions related to O levels? And even if you did so act upon what I just said rather than commenting like a buffoon.

Well i think you need to zip your mouth baboon. i was expecting an explanation on that. What's the point of posting here if i have to search thru my OLEVELS book to seek a clarification on one mcq. I don't have that book on the 1st place :|

 

[The King XII]

Well i think you need to zip your mouth baboon. i was expecting an explanation on that. What's the point of posting here if i have to search thru my OLEVELS book to seek a clarification on one mcq. I don't have that book on the 1st place :|

confused123 its cofactor because a cofactor can either be a coenzyme or ion (prosthetic group), in both cases enzymes need these cofactors to have a complete process of catalysis and so the answer should be B, correct me if I'm wrong.

 

[confused123]

confused123 its cofactor because a cofactor can either be a coenzyme or ion (prosthetic group), in both cases enzymes need these cofactors to have a complete process of catalysis and so the answer should be B, correct me if I'm wrong.

yes its B.
that's what i wanted to know rather then commands and hard suggestions..Thanks bro.

 

[The King XII]

yes its B.
that's what i wanted to know rather then commands and hard suggestions..Thanks bro.

My pleasure

 

[Peter Check]

epidemiological evidence = what does this mean?

 

[Soulgamer]

epidemiological evidence = what does this mean?

Epidemiology is the study of the distribution and patterns of health-events, health-characteristics and their causes or influences in well-defined populations. It is the cornerstone method of public health research, and helps inform policy decisions and evidence-based medicine by identifying risk factors for disease and targets for preventive medicine. Epidemiologists are involved in the design of studies, collection and statistical analysis of data, and interpretation and dissemination of results (including peer review and occasional systematic review).
Major areas of epidemiological study include outbreak investigation, disease surveillance and screening (medicine), biomonitoring, and comparisons of treatment effects such as in clinical trials. Epidemiologists rely on a number of other scientific disciplines such as biology (to better understand disease processes), biostatistics (to make efficient use of the data and draw appropriate conclusions), and exposure assessment and social science disciplines (to better understand proximate and distal risk factors, and their measurement).

 

[Soulgamer]

So how many past papers have ya'll done?
I'm done with

(1) O/N 02 [ ✓ ]
(2) M/J 03 [ ✓ ]
(3) O/N 03 [ ✓ ]
(4) M/J 04 [ ✓ ]
(5) O/N 04 [ ✓ ]
(6) M/J 05 [ ✓ ]
(7) O/N 05 [ ✓ ]
(8) M/J 06 [ ]
(9) O/N 06 [ ]

Will be done with 06 papers by 1pm INSHALLAH.
If anyone has any problems regarding these papers feel free to ask.

 

[Henry930821]

Hey guys, one question please. O/N/05 question number 25 why is the answer A instead of C? What is the difference? M/J/07 question 23 says water enters vacuoles in symplast pathway.

 

[rogue94]

Hey guys, one question please. O/N/05 question number 25 why is the answer A instead of C? What is the difference? M/J/07 question 23 says water enters vacuoles in symplast pathway.

In Symplastic movement water moves from cytoplasm to cytoplasm of adjacent cells via the plasmodesmata, so the option is A.
Here is what the Examiner Report says:
This was one of the few questions with poor discrimination. Too many able candidates chose option C,
apparently unaware of any difference between passage of water through the cytoplasm only and through the
cytoplasm and vacuoles.

As for the M/J/07 question, its comparison between apoplast and symplast. In apoplast there is no movement through cytoplasm or vacuole so symplastic movement is accepted as the movement in which water enters the vacuoles, since there is no other valid option.

 

[Henry930821]

In Symplastic movement water moves from cytoplasm to cytoplasm of adjacent cells via the plasmodesmata, so the option is A.
Here is what the Examiner Report says:
This was one of the few questions with poor discrimination. Too many able candidates chose option C,
apparently unaware of any difference between passage of water through the cytoplasm only and through the
cytoplasm and vacuoles.

As for the M/J/07 question, its comparison between apoplast and symplast. In apoplast there is no movement through cytoplasm or vacuole so symplastic movement is accepted as the movement in which water enters the vacuoles, since there is no other valid option.

Thanks !

 

[Peter Check]

Epidemiology is the study of the distribution and patterns of health-events, health-characteristics and their causes or influences in well-defined populations. It is the cornerstone method of public health research, and helps inform policy decisions and evidence-based medicine by identifying risk factors for disease and targets for preventive medicine. Epidemiologists are involved in the design of studies, collection and statistical analysis of data, and interpretation and dissemination of results (including peer review and occasional systematic review).
Major areas of epidemiological study include outbreak investigation, disease surveillance and screening (medicine), biomonitoring, and comparisons of treatment effects such as in clinical trials. Epidemiologists rely on a number of other scientific disciplines such as biology (to better understand disease processes), biostatistics (to make efficient use of the data and draw appropriate conclusions), and exposure assessment and social science disciplines (to better understand proximate and distal risk factors, and their measurement).

No offence, but if I wanted a formal factual obsessed answer, I would have looked at Wikipedia myself. I want an answer in relation to the AS level. But someone else helped me understand it so thnx anyways

 

[Soulgamer]

No offence, but if I wanted a formal factual obsessed answer, I would have looked at Wikipedia myself. I want an answer in relation to the AS level. But someone else helped me understand it so thnx anyways

Actually that helped me alot so was wondering if that would answer your question. No problem.

 

[Peter Check]

http://www.xtremepapers.com/papers/...nd AS Level/Biology (9700)/9700_w10_qp_13.pdf
How do we do 38? and for 40, isnt the right answer C??

 

[Peter Check]

Actually that helped me alot so was wondering if that would answer your question. No problem.

yeah kk, can u check out my new post in the thread about question 38 and 40? Perhaps you could help me out there.

 

[Soulgamer]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w10_qp_13.pdf
How do we do 38? and for 40, isnt the right answer C??

For 40. They have asked for correct pyramid of energy. We will make a pyramid of biomass as biomass is the renewable source of energy hence B.

My pdf is not showing that question, must be an error. (38)