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  1. R

    AS Biology P1 MCQs Preparation Thread

    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...
  2. R

    Bio p22 and 52

    nucleus, mitochondrion and rough endoplasmic reticulum.
  3. R

    Bio p22 and 52

    It was rough, although a lot of ppl wrote smooth as well.
  4. R

    Bio p22 and 52

    I guess this was the photomicrograph of the plasma cell which was given. Either this or something very similar! :)
  5. R

    Bio p22 and 52

    ATP is for energy and energy is needed for growth, similarly phospholipids are needed for the cell surface membrane of newly formed cells (for growth), DNA is needed for cell replication (nuclear division) and RNA is needed for protein synthesis, and proteins are also required for growth. I...
  6. R

    AS Biology P1 MCQs Preparation Thread

    The answer in B!!! C would have been the answer had the question asked about the transcribed strand. Since, you have to figure out the sequence of bases on the non-transcribed strand, simply replace all the U's in the mRNA sequence given with T's and you'll get your answer which is B. This...
  7. R

    Bio p22 and 52

    In the last question of the paper, about phosphate ions i wrote the following 3 uses: synthesis of ATP, formation of phospholipids and synthesis of DNA/RNA. Then i vaguely linked them to growth :confused: Basically they had asked about the uses of phosphate ions right?? :)
  8. R

    Bio p22 and 52

    how many marks did it have?? 3 i guess, anyway you had to write the name and then 2 or 3 points about the features of the inhibition you named, such as where does the inhibitor fit, what change it brings about and how it effects the enzyme catalysed reaction.
  9. R

    Bio p22 and 52

    yeah, i did the past papers before giving the paper, they accept either reversible competitive inhibition, reversible non-competitive inhibition or non-reversible non-competitive inhibition :)
  10. R

    HOW WAS PHYSICS PAPER 2 AS!!!!!!!!!!!

    I am 100% sure that force was on y-axis!!!! And the gradient would have been halved.
  11. R

    HOW WAS PHYSICS PAPER 2 AS!!!!!!!!!!!

    What about the last question of the paper, why is mass not conserved?
  12. R

    HOW WAS PHYSICS PAPER 2 AS!!!!!!!!!!!

    axes was definitely force on y axis and extension on x axis, still confused about the end point.
  13. R

    HOW WAS PHYSICS PAPER 2 AS!!!!!!!!!!!

    For the force-extension graph of Copper, it was below steel right? A straight line passing through origin, but what was the end point, i mean what was the force at .25 mm extension?? was it .65 N or 1.5 N?
  14. R

    HOW WAS PHYSICS PAPER 2 AS!!!!!!!!!!!

    KE was 1.8 J and GPE was 2.0 J
  15. R

    Bio p22 and 52

    In the question related to inhibition of respiratory enzyme of cholera, i wrote about non-competitive inhibition, but you could write about any one type of inhibition: competitive or non-competitive right??
  16. R

    Bio p22 and 52

    Yes
  17. R

    A level Biology: Post your doubts here!

    It causes cancer, by switching off the tumor supressor genes and activating proto-oncogenes to form oncogenes (genes that have the potential to cause cancer). This activation is as a result of mutation/change in DNA/damage to DNA. Also, apoptosis (programmed cell death) is inhibited. As a...
  18. R

    A level Biology: Post your doubts here!

    Epithelia line the outside of the body, since alveolar walls are in contact with air so its epithelium. Endothelia line the inside of the body such as blood vessels. Sometimes endothelium is referred to as a type of epithelium. However, you must not use these terms interchangeably in your exam...
  19. R

    A level Biology: Post your doubts here!

    yeah! :)
  20. R

    A level Biology: Post your doubts here!

    capillary wall is squamous endothelium (difference of epithelium and endothelium). Squamous cells or squames are flat cells, which are long and thin. :) Hence, squamous endothelial/epithelial cells form squamous endothelium/epithelium. Capillary endothelium is 1-2 um thick while alveolar...
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