gina_evans0312
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Year 2 Quiz on Cell & Muscle Signalling, created by gina_evans0312 on 10/20/2013.

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Cell & Muscle Signalling

Cell & Muscle Signalling

Question 1 of 22

1

What effect does extracellular homeostasis have on intracellular homeostasis?

Select one of the following:

  • It overrides it

  • It is overridden by it

  • It has no effect

Explanation

Question 2 of 22

1

What type of messenger is released by extodermal shedding?

Select one of the following:

  • Membrane bound

  • Direct diffusion

  • Vesicle bound

Explanation

Question 3 of 22

1

How are cytoplasmic formed chemical messengers released?

Select one of the following:

  • Lipophillic diffusion through the membrane

  • Dedicated passenger proteins

  • Hydrophillic diffusion through the membrane

Explanation

Question 4 of 22

1

What Mr can be passed through direct diffusion?

Select one of the following:

  • Low

  • Moderate

  • High

Explanation

Question 5 of 22

1

Which part of the myosin in the musce fibre contains the ATPase?

Select one of the following:

  • Hinge region

  • Light chain

  • Heavy chain

Explanation

Question 6 of 22

1

What make up the Troponin complex in muscle?

Select one or more of the following:

  • Troponin C

  • Troponin I

  • Troponin T

  • Actin

  • Myosin

Explanation

Question 7 of 22

1

Why is the sarcomere pronounced as a 'cell unit'?

Select one of the following:

  • Muscles are polynucleatre

  • Sarcomeres are the largest subunit

  • They are the only subunits containing both actin/myosin

Explanation

Question 8 of 22

1

What muscular receptors are effected by Ach?

Select one of the following:

  • Nicotinic Ach receptors

  • Adeninic Ach receptors

  • Adrenergic Ach receptors

Explanation

Question 9 of 22

1

How long is the half life of Ach

Select one of the following:

  • 1-2 secs

  • 10-20 secs

  • 4-5 secs

Explanation

Question 10 of 22

1

How many subunits make up Nicotinic Ach Receptors?

Select one of the following:

  • 5- 2 alpha, a beta a delta and a gamma

  • 5- an alpha, 2 beta, a delta and a gamma

  • 5- an alpha, a beta, 2 delta and a gamma

Explanation

Question 11 of 22

1

All subunits in Nicotinic Ach Receptors have a transmembrane domain of 4 helices- which one is ampipathic?

Select one of the following:

  • M1

  • M2

  • M3

  • M4

Explanation

Question 12 of 22

1

When Ach binds, the subunits twist to replace an amino acid with an inorgaic ion. Name them.

Select one of the following:

  • Leucine is replaced with Phosphate

  • Tyrosine is replace with Sodium

  • Serine is replace with Chlorine

Explanation

Question 13 of 22

1

When the impulse enters the muscle cell, what channels are opened in the T-tubule?

Select one of the following:

  • DHP

  • AHP

  • CHP

Explanation

Question 14 of 22

1

Once the DHP receptor has been opened, which receptor does it open in the Sarcoplasmic Reticulum?

Select one of the following:

  • Ryonadine

  • Acetylcholamine

  • Phosphodine

Explanation

Question 15 of 22

1

What keeps the Ca2+ concentration in the sarcoplasmic reticulum so high?

Select one of the following:

  • ATP driven Ca2+ pumps

  • Ca2+/Cl- co-transporters

  • Ca2+/Na+ exchange

Explanation

Question 16 of 22

1

Of the transmembrane helices in DHP, which do which jobs?

Select one of the following:

  • S4 - voltage sensing
    S5-6 form pores

  • S5-6 - voltage sensing
    S4-form pores

  • S2 - voltage sensing
    S3-4 form pores

Explanation

Question 17 of 22

1

What allows the DHP receptor to communicate with the Ryonadine receptor?

Select one of the following:

  • Loops II-III

  • Loops III-IV

  • Loops I-II

Explanation

Question 18 of 22

1

In the ryonadine receptor, the 6 hydrophobic helices are found in make up how many identical subunits?

Select one of the following:

  • 4

  • 5

  • 6

  • 7

Explanation

Question 19 of 22

1

The pore is formed in ryonadine receptors by what?

Select one of the following:

  • The loops between S9 & S10

  • The loops between S10 & S11

  • The loops between S8 & S9

Explanation

Question 20 of 22

1

What protein holds the Ca2+ inside the sarcoplasmic reticulum for extra security?

Select one of the following:

  • Calsequestrin

  • Calcitachin

  • Calcibindin

Explanation

Question 21 of 22

1

Which subunit of the dihydropyridine receptor contains 4 homologous transmembrane domains?

Select one of the following:

  • Alpha 1

  • Beta

  • Alpha 2

  • Gamma

Explanation

Question 22 of 22

1

How many helices make up each one of the four homologous transmembrane domains in the alpha one subunit of Dihydropyridine receptor?

Select one of the following:

  • 6

  • 4

  • 8

Explanation

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