Responding to Change Random Retrieval

What is the role of phosphocreatine in muscle contraction?

In the sliding filament theory, what causes the actin-myosin binding site to be exposed?

Which protein blocks the actin-myosin binding site in a relaxed myofibril?

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

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?

True or False - Axons with a narrower diameter have a faster speed of conduction.

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:

What the the tiny gaps called labelled X on the above diagram? ( Type your answer)

Put the above events ( A-F) in order for the passage an action potential.

Which direction are the ions moving during process 3 on the above diagram?

Name protein B in the above diagram.

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

The resting potential of a neurone is maintained in part, by the Sodium-potassium pump. But which of the following shows the correct movement of the ions?

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

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

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

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

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

In root tips growing parallel to the soil, where will the highest concentration of IAA be found ?

What effect does low concentrations of IAA have on root tissue?