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Biology for a-level students home work

Discussion in 'Jukwaa la Elimu (Education Forum)' started by segwanga, Mar 22, 2011.

  1. segwanga

    segwanga JF-Expert Member

    #1
    Mar 22, 2011
    Joined: Mar 16, 2011
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    BIOLOGY HOME WORKS SERIES
    For advanced level students, observe the date and day please

    MONDAY 21/03/2011

    1. A biologist isolated a sample of an enzyme called lactase from the intestinal lining of of a calf. The substrate of lactase is lactose which is broken into galactose and glucose. She prepared 2% enzyme solution with different concentrations of lactose and measured the rate of galactose production. She recorded the results as shown below.
    Lactose concentration
    0
    5%
    10%
    20%
    30%
    Enzyme concentration
    2%
    2%
    2%
    2%
    2%
    Reaction rate
    0
    25
    50
    65
    65

    (i)Sketch a graph of rate versus lactose concentration
    (ii)Explain the relationship between the rate of reaction and the substrate
    concentration.

    TUESDAY 22/03/2011
    2. (a)Define each of the following
    (i)Lipid
    (ii)Carbohydrate
    (b)Why do many organisms store lipids rather than carbohydrates?
    WEDNESDAY 23/03/2011
    3.State the role of each of the following
    (i)Enterokinase
    (ii)Columnar epithelium
    (iii)Goblet cells
    THURSDAY 24/03/2011
    4.(i)Why is photorespiration more common in C3 plants than C4 plants?
    (ii)Why are C4 plants more efficient in photosynthezing than C3

    FRIDAY 25/03/2011

    5. (a)Define each of the following
    (i)ATP
    (ii)Activator
    (iii)Coenzyme
    (b)Briefly explain the induced fit and Lock and Key model of enzyme action

    SATURDAY 26/03/2011
    6. (a)Define each of the following
    (i) Autolysis
    (ii) Outophagy
    (iii) Pinocytosis
    (b)Discuss four factors which affect the rate of enzyme catalyzed reactions.

    SUNDAY 27/03/2011
    7.(a) Describe the structure and functions of ATP
    (b)Why is ATP known as the “the common energy currency” of the cell?


    SUBMIT YOUR ANSWERS EVERY DAY FOR DISCUSSION HERE @ JF
     
  2. ndetichia

    ndetichia JF-Expert Member

    #2
    Mar 22, 2011
    Joined: Mar 18, 2011
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    i remember only one thing C6H12O6 is type of food...
     
  3. Papa Diana

    Papa Diana JF-Expert Member

    #3
    Mar 22, 2011
    Joined: Dec 21, 2010
    Messages: 304
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    Hapa naona mwalimu nitapata refresher ya biology!! muda mrefu sana sijafanya hiii...ni na digrii ya chemistry!
     
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