Which of the following statement/s correctly describe the event that occurs in axoplasm as shown above.

I. 3 Na⁺ ions are pumped into the membrane by sodium ion II. Sodium potassium pump responsible to pump 2 K+ ion out from axoplasm

III. Na⁺ ion concentration is higher outside compared to inside of neuron

IV. The sum gradient of -70 mV current voltage inside of neuron is maintained by sodium-potassium pump.

To initiate an action potential, the following must occur EXCEPT .

When the axoplasm is in polarization phase, the active channels are as follows

I Na⁺ channel

II K⁺ channel

III Na-K pump

IV Voltage gated K⁺ channel

During an action potential

I Na⁺ voltage gated channel opens

II Na-K pump actively pump Na⁺ and K⁺ ions

III Voltage gated K⁺ channel closes

IV Influx of Na+ changing the axoplasm to become positively charged

The following events occurs to establish a resting potential. Choose the correct sequence

I NA-K pump activated

II Many anions remain in the axoplasm

III Na⁺ ion is pumped out of axoplasm

IV More K⁺ relatively diffuses out through K channel charged

Figure represent the changes during transmission of a nerve impulse. Choose the correct pair to identify the phases shown 6, 7, 8 and 9.

Which of the following is CORRECT during phase labeled 10

The following statements are correct regarding the relative refractory period EXCEPT

During a synaptic transmission in the limbic centre, the neurotransmitter required is

The fusion of synaptic vesicle to the presynaptic membrane is driven by the presence of __________ ion.

Which of the following is TRUE about the structure and function of components I, II, III and IV shown in the figure.

I Causing the ligand-gated Na⁺ channel to open

II Release neurotransmitters to the synaptic cleft by exocytosis

III Allow Ca²⁺ to diffuse into synaptic knob

IV Reuptake of neurotransmitter

In the presence of cocaine, the transmission of impulse is continuous and causes constant _____________ state in structure labeled B.

The substance important to regulate depolarization of postsynaptic membrane is

The following events occur during synaptic transmission with the presence of cocaine EXCEPT

The function of structure labeled X is

Which of the following statement is / are TRUE during the contraction of muscle fibres?

I Calcium ion is released into sarcoplasm from sarcoplasmic reticulum

II Tropomyosin is exposing troponin

III Hydrolysis of ATP on myosin head

IV Thin filament move to the centre of sarcomere

During contraction, the myosin head is

The correct pair of the structure

I sarcomere

II H zone

III A band

IV I band

The neurotransmitter required during an action potential of sarcolemma is

Which of the following hormone is lipid soluble ?

Which of the following correctly describe the function of cyclic AMP?

Which of the following event DOES NOT occur during gene activation mechanism?

Enzyme required to catalyze the conversion of ATP during the breakdown of glycogen is

Which of the following is the active form of phytochrome?

During a 16 hr exposure to light, which of the following truly describe the response of a short day plant

II Not flowering

II Flowering

III Flowering when darkness interrupted by flashes of 10 hour red light

IV Flowering when darkness interrupted by flashes of 0 hour far red light

The following statements correctly describe the Critical night length EXCEPT

The hormone needed in plant to stimulate flowering is

Which of the following will induce flowering in spinach?

Select the correct match of the following to differentiate between mechanism of steroid and non steroid hormone