Turn on thread page Beta

AQA BIOL1 Biology Unit 1 Exam - 16th May 2011 watch

  • View Poll Results: Are you resitting this unit?
    YES!
    54.92%
    NO!
    45.08%

    Offline

    13
    ReputationRep:
    (Original post by Reminisce)
    - Large surface area (cilia)
    - Cilia moves (high conc. of glucose always)
    - Thin (short diffusion pathway)
    - Many carrier proteins for Facilitated Diffusion
    - Co-transporter

    And I explained them, etc. etc. etc.

    Wasn't it microvili?

    And the active transport of sodium ions, to maintain a concentration gradient towards the epithelial cells for the glucose-sodium symport.

    I also wrote "many mitochondria" considering it uses ATP for active transport of sodium.

    (Original post by liviaaa)
    What about, how was the death rate calculated? I put:

    Find out all the ages people died from breast cancer in a country, add them all together then divide by the total number (work out the mean), then equate this to per 100,000.
    Yeah I did that too, looked rational to me. :cool:
    Offline

    0
    ReputationRep:
    (Original post by Stratos)
    Wasn't it microvili?

    And the active transport of sodium ions, to maintain a concentration gradient towards the epithelial cells for the glucose-sodium symport.

    I also wrote "many mitochondria" considering it uses ATP for active transport of sodium.
    Yeah I put villi and microvilli too.

    Oh that's a good idea for mitochondria - I didn't think of that.
    Offline

    10
    ReputationRep:
    (Original post by Stratos)
    Wasn't it microvili?

    And the active transport of sodium ions, to maintain a concentration gradient towards the epithelial cells for the glucose-sodium symport.

    I also wrote "many mitochondria" considering it uses ATP for active transport of sodium.
    Yes microvilli, sorry
    Offline

    18
    ReputationRep:
    OK got some wrong, got some right.
    Offline

    13
    ReputationRep:
    Seems like my 1 day revision payed of, or it's the 3 previous times I did this exam which caused me to get used to it...
    Offline

    0
    ReputationRep:
    (Original post by Stratos)
    Wasn't it microvili?

    And the active transport of sodium ions, to maintain a concentration gradient towards the epithelial cells for the glucose-sodium symport.

    I also wrote "many mitochondria" considering it uses ATP for active transport of sodium.
    Same here a large no. of mitochondira
    I also put that it's supplied with a network of capillaries where circulation of blood transports absorbed materials away, maintaining a steep concentration gradient.
    Still, I'm not sure if that's a feature of the epithelial cell or not... :confused:
    Offline

    5
    ReputationRep:
    Ok

    1ai) hydrolysis
    ii) glucose
    iii) cant remember
    iv) two reducing sugar molecules are formed from one
    v) cant remember
    vi) the lactose stays in the lumen, lowers water potential, water enters lumen, causes diarrhoea
    Offline

    18
    ReputationRep:
    What do you think the grade boundaries will be? :afraid:
    Offline

    13
    ReputationRep:
    (Original post by questionandanswer)
    Ok

    1ai) hydrolysis
    ii) glucose
    iii) Benedict solution, sample should become red
    iv) two reducing sugar molecules are formed from one
    v) galactose structure similar to lactose dissacharide
    vi) the lactose stays in the lumen, lowers water potential, water enters lumen, causes diarrhoea
    fixed ^__^.
    Offline

    5
    ReputationRep:
    Also, did everyone say the maximum rate of reaction was 30.5 or just 30/31?
    Offline

    0
    ReputationRep:
    (Original post by questionandanswer)
    Ok

    1ai) hydrolysis
    ii) glucose
    iii) cant remember
    iv) two reducing sugar molecules are formed from one
    v) cant remember
    vi) the lactose stays in the lumen, lowers water potential, water enters lumen, causes diarrhoea
    For part iv) I also mentioned water being used... but I'm not sure
    Offline

    0
    ReputationRep:
    (Original post by questionandanswer)
    Ok

    1ai) hydrolysis
    ii) glucose
    iii) cant remember
    iv) two reducing sugar molecules are formed from one
    v) cant remember
    vi) the lactose stays in the lumen, lowers water potential, water enters lumen, causes diarrhoea
    iii) Heat with Benedicts, turns a brick red ppt if reducing present
    iv) hydrolyses into 2 molecules, so a larger surface area for the Benedicts to react with
    Offline

    0
    ReputationRep:
    (Original post by questionandanswer)
    Also, did everyone say the maximum rate of reaction was 30.5 or just 30/31?
    30
    Offline

    0
    ReputationRep:
    1aiii was to do with benedict solution and testing for reducing sugars (solution goes red)
    Offline

    0
    ReputationRep:
    (Original post by failingatm)
    What do you think the grade boundaries will be? :afraid:
    Ermm average to high? (Or high by AQA standards..)
    Offline

    14
    ReputationRep:
    (Original post by questionandanswer)
    Also, did everyone say the maximum rate of reaction was 30.5 or just 30/31?
    I put 30,
    but I reckon it will be 30-31 tbh, because the graph was pretty unclear about it.
    Offline

    10
    ReputationRep:
    (Original post by liviaaa)
    Ermm average to high? (Or high by AQA standards..)
    You could lose 9 raw marks and get full UMS in Winter 2011 and I think it's similar so perhaps the same tbh...
    Offline

    5
    ReputationRep:
    Emphysema Question
    - Elastin Permanently stretched
    - Alveolar septum broken down
    - less surface area for diffusion
    -loss of elastin makes it harder to breathe out
    - reducing concentration gradient of oxygen
    - less diffusion

    Phagocytes Question
    - Attracted to bacteria by chemoattractants
    - engulf bacteria
    - form phagosome
    -lysosome moves to bacteria and releases enzymes
    - bacteria digested
    - soluble products absorbed

    Epithelium
    - Villi, microvilli
    -large surface area
    -carrier proteins
    - co transport sytem and explanation
    - good blood supply?
    Offline

    1
    ReputationRep:
    What did people put for the time atria ventricular valves were closed ?? And why ??
    Offline

    0
    ReputationRep:
    (Original post by questionandanswer)
    Emphysema Question
    - Elastin Permanently stretched
    - Alveolar septum broken down
    - less surface area for diffusion
    -loss of elastin makes it harder to breathe out
    - reducing concentration gradient of oxygen
    - less diffusion
    Yeah I put:

    -Elastin broken down
    -Less elasticity, so lungs can't recoil/fully empty - breathing out no longer passive
    -Alveoli walls break down, less surface area
    -Thickened alveoli walls, longer diffusion pathway
    -Reducded conc. gradient
    -So all equals less diffusion
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: March 7, 2012
The home of Results and Clearing

1,274

people online now

1,567,000

students helped last year

University open days

  1. London Metropolitan University
    Undergraduate Open Day Undergraduate
    Sat, 18 Aug '18
  2. Edge Hill University
    All Faculties Undergraduate
    Sat, 18 Aug '18
  3. Bournemouth University
    Clearing Open Day Undergraduate
    Sat, 18 Aug '18
Poll
A-level students - how do you feel about your results?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.