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 role of ATP in muscle contraction is to provide the energy required for the 'powerstroke' of the myosin head. What is the other use of ATP in muscle contraction?

To 'reset' the myosin head.

To break the actin-myosin cross bridge.

To release Calcium ions.

2 / 20

Breaks down ATP on myosin head

ATPase

ATP Synthase

Calcium ions

3 / 20

Name the molecule that carries out the function : Attaches to the Z line at the end of the sarcomere.

Actin

Myosin Tails

Myosin Heads

4 / 20

Which of the above diagrams represents either end of an 'A Band' in muscle?

A

B

C

5 / 20

When light falls on cells 1 and 2, only one spot of light is seen. But, when light falls on cells 2 and 3, two spots of light are seen. Say why?

1 & 2 share a neurone, and 2 and 3 share a neurone.

1 & 2 share a neurone, and 2 and 3 have separate neurones.

2 and 3 are both cone cells.

6 / 20

Whether a synapse is excitatory or inhibitory depends on what?

The concentration of the neurotransmitter released.

The type of neurotransmitter released.

The concentration of calcium ions.

7 / 20

On the diagram, which type of ion will D allow through when opened on an excitatory synapse?

Sodium ions

Potassium ions

Calcium ions

8 / 20

Why does an increase in temperature ( up to 40 degrees) cause an increase in the speed of conduction along a neurone?

Faster production of ATP.

Faster rate of enzymes.

Faster rate of diffusion of ions.

9 / 20

True or False - The speed of conduction along an unmyelinated neurone is around 5 m/s ( jogging pace).

TRUE

FALSE

10 / 20

When an action potential is generated, there is a temporary reversal of the polarity of the neurone membrane at that point. Does this mean that:

The inside becomes more negative compared to the outside.

The outside becomes more negative compared to the inside.

The outside becomes more positive compared to the inside.

11 / 20

True or false: If more sodium channels are opened by a stimulus, then the action potential which is generated is bigger.

TRUE

FALSE

12 / 20

What do we call the process happening at '3' on the above diagram?

Depolarisation

Polarisation

Repolarisation

13 / 20

Stimulation ( either by a generator potential in a receptor cell or a neurotransmitter binding to a receptor on a postsynaptic membrane) caused which type of channel to open?

Sodium Leakage Channels.

Voltage Gated Sodium Channels.

Voltage Gated Potassium Channels.

14 / 20

The plasma membrane of a neurone at rest is most permeable to which ions via facilitated diffusion?

Chlorine ions

Sodium Ions

Potassium Ions

15 / 20

Across a resting human neurone plasma membrane, what is the average potential difference?

+70mV

-70mV

-70V

16 / 20

True or false : Kinesis is a random movement

TRUE

FALSE

17 / 20

True or False : Kinesis is a directional response to a stimulus.

TRUE

FALSE

18 / 20

What would be a suitable control for Went's experiment ?

The same experiment, but with a different species of plant shoot.

The same experiment but with a gelatin block without a shoot tip having been placed on it.

The same experiment, but with light coming from the opposite direction.

19 / 20

Which of these statements about Went's experiment is NOT true?

That plant growth is probably caused by a chemical which can diffuse.

That a substance produced in the tip can move (diffuse) into gelatin, and then out again.

Gelatin blocks stimulate growth.

20 / 20

What word describes the growth response of a plant to a stimulus?

Tropism

Trophism

Tropasm

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