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  1. J

    AS Biology P1 MCQs Preparation Thread

    The ans is C. The ques asked about NET. 4% is not the net. 1.75% is the net productivity. Hence, it's energy passed on divided by the net energy available :D
  2. J

    AS Biology P1 MCQs Preparation Thread

    Hope this helps and so you can relate the structure. :D
  3. J

    AS Biology P1 MCQs Preparation Thread

    Hi there. Cholera can be passed on to their children. This explanation may seem abit funny to you but it's true. Parents can prepared food for their children so there's a chance of contaminating the food :D
  4. J

    AS Biology P1 MCQs Preparation Thread

    For part 1, the ans is D because during telophase, spindle will start to disintegrate. Part 2, options 1 and 3 refers to cohesion-tension theory. So the remainings are the answer. So sorry i do not know how to explain option 2 and 4. Part 3, only trachea and bronchus have cartilage. Respiratory...
  5. J

    AS Biology P1 MCQs Preparation Thread

    Hey, what's the difference between reducing transpiration rate and reducing water potential gradient ??? For reducing transpiration rate, rolled leaves, fleshy leaves, sunken stomata and thick cuticle are needed. As for reducing water potential gradient, only rolled leaves, hairy leaves and...
  6. J

    AS Biology P1 MCQs Preparation Thread

    Yea you should.
  7. J

    AS Biology P1 MCQs Preparation Thread

    Oh i see. Thanks friend :D
  8. J

    AS Biology P1 MCQs Preparation Thread

    The question says structural. A refers to aplha-glucose (1.4-glycosidic bond). So, the thing that should come across your mind is cellulose. Cellulose provides structural support :D The monomers for cellulose is beta-glucose.
  9. J

    AS Biology P1 MCQs Preparation Thread

    THX. Btw, what does condensation and spiralisation of DNA really means ??
  10. J

    AS Biology P1 MCQs Preparation Thread

    Hi. Why does spiralisation and condensation of DNA happen during prophase ?? Why isn't it interphase ??
  11. J

    AS Biology P1 MCQs Preparation Thread

    When it's getting colder, the membrane will be less fluid. Since unsaturated bonds are less saturated, i think they'll contribute to the fluid-ness of the membrane. Erm, how about cholesterol then ?? They also maintain the fluidity of the membrane right ?? What is the difference between the role...
  12. J

    AS Biology P1 MCQs Preparation Thread

    The question is trying to troll us. Always remember, the colour changes from blue - green - yellow - brown - brick-red.
  13. J

    AS Biology P1 MCQs Preparation Thread

    In water-logged areas, there will be less amount of O2. Hence, this will contribute to anaerobic condition. Denitrifying bacteria lives well in anaerobic conditions. So, process of denitrification will increase (Y)
  14. J

    AS Biology P1 MCQs Preparation Thread

    Erm, you got it right for 2 only :( Erm, for 1, the ans is D. It can't be having the same water potential in lake water. It'll restrict the entry of water since there's a presence of cell wall. The vacuole will push against the cell wall. :) As for 3, the ans is A. For choice 1, bond breaking...
  15. J

    AS Biology P1 MCQs Preparation Thread

    Ooops, so sorry. I made a mistake over there. Disulphide bridge will only occur in tertiary and quatenary structure. Since the ques says btwn 2 amino acids, so it's a primary structure. Hence, only peptide bond is involved. Part A i'm not sure then :(
  16. J

    AS Biology P1 MCQs Preparation Thread

    Hi. The question stated only 1,4-glycosidic bonds are hydrolysed. So, only the left and right glucose are released from the molecule. Since 2 bonds are broken, two H2O molecule is needed. The middle glucose and the top glucose will remain attached as the bond joining them is 1,6-glycosidic bond...
  17. J

    AS Biology P1 MCQs Preparation Thread

    Hi. As for part (A), are you talking about cell cycle ?? If its yes, i guess it happens during interphase. There are G1,S,G2. During S phase, this is where the DNA will replicate. Hope it helps. For (B,1), the S.A.V ratio refers to the surface area of the alveolus. When there's emphysema...
  18. J

    AS Biology P1 MCQs Preparation Thread

    Hi. Need some help here :( Why is the answer for question 33 (paper 13,M/J/11) A not B ?? Oh btw, same year same paper question 40. Why is the ans C ??? Really don't understand. :unsure:
  19. J

    AS Biology P1 MCQs Preparation Thread

    Haha. Oooopss. Thanks Friend !!
  20. J

    AS Biology P1 MCQs Preparation Thread

    Thx bro !!! All the best for tomorrow !!
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