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  1. S

    A level Biology: Post your doubts here!

    Okay so: A is number if nutrients B is intensity of light C is no of producers D is no of primary consumers
  2. S

    Chemistry: Post your doubts here!

    Lol mercury is a metal and doesn't exist as a sume molecule. It's actually because there are relatively weaker electrostatic forces between its positive ions and its sea of electro s
  3. S

    Chemistry: Post your doubts here!

    Is the same difference as that between alpha and beta glucose molecules. The chlorine atom can either be above the ring or below it, and so depending on its position, it forms a different and specific compound
  4. S

    Chemistry: Post your doubts here!

    Yes with an aldehyde as the intermediate
  5. S

    A level Biology: Post your doubts here!

    Isn't the Bond between the amine and carboxylic group, the peptide bond? So isn't that the primary structure
  6. S

    Chemistry: Post your doubts here!

    Haha sorry I meant iodides...autocorrect -.-
  7. S

    Mathematics: Post your doubts here!

    So well get the same answer if we find the area collectively? Doesn't the negative sign reduce the total area?
  8. S

    Chemistry: Post your doubts here!

    I though chlorides were soluble in ammonia and that upsides weren't ..
  9. S

    A level Biology: Post your doubts here!

    Root pressure is built up due to osmosis s dthe difference in water potential. So you basically explain how water moves through the symbolist route in the endodermis and how it leaves the previous cells it moved through(including the root hair cells) having a lower water potential, so water...
  10. S

    Mathematics: Post your doubts here!

    In integration, when were determining the area or the volume and the range is following over both positive and negative values, do we have to divide the values into positive and negative sections? For example if the value are from -1 to 3, do we do f the area or the volume from -1 to 0 and 0 to...
  11. S

    Post your AS-Level Mathematics (P1 and M1) doubts here.

    But that's sime elimination. I meant how do u solve this by dividing the equations
  12. S

    Chemistry: Post your doubts here!

    Why does ammonia react with NaCl but no with NaI? Isn't iodide more reactive than chloride due to its weaker bond energy? ANYONE?
  13. S

    A level Biology: Post your doubts here!

    How is that confusing? Carrier proteins change into a conformational shape to allow ions, glucose, amino acids etc to pass through...just like you said. And channel proteins allow small ions to diffuse through their channel pores without changing their shape
  14. S

    Chemistry: Post your doubts here!

    Um for silicon chlorides reaction with water, do we write Si(OH)4 as the product, or SiO2,?
  15. S

    A level Biology: Post your doubts here!

    Kinda ..
  16. S

    A level Biology: Post your doubts here!

    Stents ions taken up by active transport?
  17. S

    A level Biology: Post your doubts here!

    That's why I said similar and not the same.. Readings up till 2 decimal place are more precise yup. Active transport takes place through only carrier protei s but facilities diffusion can occur in both channel and carrier proteins
  18. S

    Post your AS-Level Mathematics (P1 and M1) doubts here.

    But how do you solve it by dividing the equations? :S and why can't solve the equation I originally wrote through simple elimination?
  19. S

    Post your AS-Level Mathematics (P1 and M1) doubts here.

    40= 2a + 9d 23= a + 5d
  20. S

    A level Biology: Post your doubts here!

    Water has moved out of the cell in diagram 1 so solution W is more negative than X, but solution Y is less negative than X since water has moved in...so I'll have to go with A
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