Biology Mock Answers

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Question 1

1a) Draw Arrow Going up the Stoma with Carbon Dioxide on it and draw and arrow coming out of the stoma with Oxygen on it.

1b) Tick/ Hairs reduce air movement around the lower surface of the leaf.

      Tick/ Water vapur builds up inside the rolled up leaf.

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Question 2

6 Marker

-Refer to Lock and Key Model- it won't fit the lock and key model.

-Refer to how active site needs to be correct shape.

-Refer to substrate fitting in active site.

-Refer to changing shape of active site/denaturing.

-Refer to bond breaking.

-Substrate No longer fits.

-Reversibility

-No reaction at below pH 3 as acidic, Optimum pH is 6 as neutral

-No reaction at pH 9 as it is too alkaline

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Question 3

3a- 2880/150=19.2

3b- Type A provides a lot of energy/ Less production of lactic acid like Type B.

3c- I don't think her conclusion fits the graph. This is because in section A there is no correlationas one goes up and one stays the same. In section B there is a positive correlation as both go up. In section C one goes up and one decreses, a negative correlation. Finally in section they both go down so it is a positive correlation.

ii- Tick (Repeat the same training a number of times).

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Question 4

4a) Tick ( Genes to make Chlorophyll)

      Tick  (Genes to make a Cell Membrane)

      Tick (Genes to make Enzymes)

4b) Tick (Embryos are living things)

      Tick (Embryos can develop into human Beings)

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Question 5

Question 5: 6 marker

-DNA contains bases A T C G

-The order of the bases is coding for amino acids.

-3 bases need to code for 1 amino acid as a triplet code.

-DNA unzips.

-mRNA takes a copy of the genes with the genetic information.

-mRNA leaves the nucleas through nuclear pores.

-mRNA goes to the cytoplasm and then to the ribosome.

-The cytoplasm is where the enzyme is made.

-Amino acids are added in the correct sequence which forms an enzyme

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Question 6

6a) 10 to the power of 9

b) -Increasing auxin concentration doesn't always mean more growth

    -Stimulation deceases from 8ppm in shoots.

    -Maximum stimulation in shoots is at 8ppm

c)

    -Auxin is produced in plant tip

    -Auxin diffueses downwards and backwards to tge dark side away from light.

    -On the dark side there is more growth and the plants becomes elongated.

    -Plant then bends to grow towards light

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Question 6

6a) 10 to the power of 9

b) -Increasing auxin concentration doesn't always mean more growth

    -Stimulation deceases from 8ppm in shoots.

    -Maximum stimulation in shoots is at 8ppm

c)

    -Auxin is produced in plant tip

    -Auxin diffueses downwards and backwards to tge dark side away from light.

    -On the dark side there is more growth and the plants becomes elongated.

    -Plant then bends to grow towards light

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Question 7

7a) There is not enough information to be certain. C is not lower back and B is not upper front.

7b) Tick-SSRIs block sites where serotonin is removed from synapse.

      Tick-SSRIs stimulate the serotonin receptor sites on the second neuron

      Tick-SSRIs have a similar effect to serotonin

      Tick-SSRIs effects are due to an increaed serotonin concentration in the synapse

7c) The patient may not recieve compensation and benefit from the research. The patient will probably be unable to give consent with brain damage.

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Question 8

8a) Write C in Steve is frightened of the dentist

      Write C in A baby who was frightened by a clown cries wehn given a clown doll.

8b) -Dog sees Food --> Primary Stimulus

     -Dog produces saliva --> Final Response

     -Dog hears bell ring --> Secondary stimulus

8c) If a predator (like a bird)  eats a posionous brightly coloured animal. It learns top relate colour with poison so stops eating brightly coloured animals.

8d) Learn to send the nerve impulse to the brain instead of a reflex arc.

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Question 9

Question 9 6 Marker

-The stimulus is caught by the receptors in the squirell's eyes

-This electrical impulse goes along sensory neurones.

-These impulses are very fast.

-It reaches the CNS almost instantaneously where a response to the predator is coordinated.

-Between the neurones the impulses have to converted into chemical transmitters so they can diffuse across the synapse and then be reabsorbed into the neurones.

-The CNS then sends the impulse to the motor neurones.

-The impulse travels along the motor neurone to the effector muscles. 

-This almost instantaneous reflex arc causes the squirell to go and hide in a short lived reaction.

-This gives the squirrell a better chance of survival.

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