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

Which of the following are features of slow twitch muscle fibres:

A)Lots of aerobic respiration
B)Lots of mitochondria
C)Low levels of myoglobin

A & C

A & B

A, B & C

2 / 20

Breaks down ATP on myosin head

ATPase

ATP Synthase

Calcium ions

3 / 20

Which of the above diagrams represents the myofilaments a 'Z line' in muscle?

A

B

C

4 / 20

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

5 / 20

Doctors investigated two ways of measuring the effect of general anaesthetics. In one method they timed how long it took to stop blinking, and then repeated the investigation using a machine to record when brain activity showed they were unconscious. Blinking involves cholinergic synapses. Anaesthetic S is a similar shape to acetylcholine. Suggest how anaesthetic S stops the transmission across the synapse.

S acts as an agonist

S acts as an antagonist

S inhibits the enzymes that break down acetylcholine

6 / 20

True or False: Synapses can only transmit an impulse in one direction?

TRUE

FALSE

7 / 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.

8 / 20

Once an action potential has been generated, what causes the next section of the axon membrane to become depolarised?

Some sodium ions diffuse through the cytoplasm, and cause voltage gated sodium channels to open.

Some potassium ions diffuse through the cytoplasm, and cause voltage gated potassium channels to open.

Voltage gated sodium channels are open all the time, so the sodium ions just diffuse out.

9 / 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.

10 / 20

True or False: If too few sodium channels are opened by a stimulus on an neurone membrane, then no action potential is generated.

TRUE

FALSE

11 / 20

Name stage 5 on the above diagram ( spell it carefully!)

12 / 20

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

Sodium Ions

Potassium Ions

Phosphate Ions

13 / 20

Name protein A in the above diagram.

Sodium Ion Channel

Potassium Ion Channel

Sodium-potassium pump

14 / 20

Name protein B in the above diagram.

Sodium Ion Channel

Potassium Ion Channel

Sodium-potassium pump

15 / 20

When an neurone axon is at rest, what charge is the extra cellular fluid compared to the cytoplasm?

a) Simple Diffusion
b) Facilitated Diffusion
c) Active Transport

Positive

Negative

Neutral

16 / 20

Blow fly maggots have a light sensitive spot on their head, which they use to move away from light. Is this taxis or kinesis?

Taxis

Kinesis

17 / 20

What is the definition of a stimulus?

A change in the internal environment.

A change in the external environment.

A change in the internal or external environment.

18 / 20

What does this experiment by Went show?

That uneven distribution of a chemical from a shoot tip controls growth.

That even distribution of a chemical from a shoot tip controls growth.

That gelatin controls growth.

19 / 20

What affect does IAA have on shoot tips?

Mitosis

Elongation

Inhibition

20 / 20

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

Tropism

Trophism

Tropasm

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