Responding to Change Random Retrieval

This quiz contains all the questions in the Responding to Change section. The website will pick 20 questions at random.

1 / 20

One form of muscle disease is caused by a mutated allele of a gene. This leads to production of myosin molecules that are unable to bind to other myosin molecules. If myosin molecules are unable to bind to other myosin molecules, this prevents muscle contraction. Suggest why.

It cannot pull on the actin. The myosin filaments will just slide past each other.

The actin - myosin cross bridges will not form.

The actin - myosin cross bridges will not break.

2 / 20

Which of the above diagrams represents the myofilaments an 'M line' in muscle?

A

B

C

3 / 20

In the above image, which type of protein makes up the myofilaments labelled C? type your answer in carefully.

4 / 20

What is the stimulus detected by a Pacinian corpuscle? (type your answer)

5 / 20

Can the potential difference created by a receptor have different values depending on the size of the stimulus?

Yes

No

6 / 20

If a neurotransmitter binds to the post synaptic membrane and causes potassium ion channels to open, would it be excitatory or inhibitory?

Excitatory

Inhibitory

7 / 20

Using the diagram, name C

Synaptic Gap

Synaptic Cleft

Synaptic Space

8 / 20

Axons with a wider diameter axon have...

More sodium ions for diffusion.

More resistance to the flow of ions through the cytoplasm.

Less resistance to the flow of ions through the cytoplasm.

9 / 20

Why is the speed of conduction faster on myelinated neurones?

The sheath creates a hydrostatic pressure, pushing the ions and therefore the action potential along.

The sheath keeps the axon warmer, therefore diffusion is faster.

Due to action potentials only occurring at the gaps between the sheath, so the impulse 'jumps' between them.

10 / 20

Once an action potential has been generated, why is the wave of depolarisation only in one direction?

Hyperpolarisation means potassium channels are working at capacity.

Sodium ions only ever diffuse away from the cell body.

The refractory period means that voltage gated channels are 'locked' closed.

11 / 20

Why can't a second action potential pass immediately after the first ?

During this period the Sodium-potassium pump is not operational.

During this period the voltage gated sodium channels are locked shut.

During this period the potentil difference across the plasma membrane remains positive.

12 / 20

The period of time after an action potential, when another action potential cannot pass along that section of a neurone is called the ____________ period ( Watch your spelling).

13 / 20

Which of the events ( A- F above) requires ATP ? ( Type the letter in the box)

14 / 20

What causes a change in the type of channels that are open at stage '4' ?

A change in potential difference.

The passage of 1.5ms since the stimulation occurred.

The generation of a second action potential.

15 / 20

What ion is moving during process '3' on the above diagram?

Sodium Ions

Potassium Ions

Phosphate Ions

16 / 20

In a resting neurone, why do potassium ions move out via ion channels?

Due to the greater concentration on potassium ions on the inside compared to the outside.

Due to the electrochemical gradient.

Due to the lower concentration on potassium ions on the inside compared to the outside.

17 / 20

True or False : Taxis is when an organism either moves faster in harsh conditions or turns less in harsh conditions.

TRUE

FALSE

18 / 20

What does Darwin's experiment where he placed a black cover over the tip show?

That directional light on the tip effects the direction of growth.

That directional light does not effect direction of growth.

That aluminium foil is toxic to shoot tips.

19 / 20

What does Darwin's experiment where he removed a shoot tip then replaced it show?

That the shoot tip is not needed for shoot growth.

That the shoot tip is responsible for shoot growth.

That growth is controlled below the shoot tip.

20 / 20

How does IAA become unevenly distributed?

Bright light destroys IAA.

Shade stimulates the production of IAA.

IAA moves away from light.

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