Question: 50 of 70 What characteristic of receptors aids in...

Question: 50 of 70 What characteristic of receptors aids in the selective permeability of the cell membrane? Receptor sites match the shape of a specific chemical. Receptor sites can match a wide range of chemical configurations. Receptor sites prevent direct passage of substances. Receptor sites permit direct free passage of substances readily across the cell membrane.

Transcript

00:01 Question 8 discuss about the types of neurotransmitter receptors.

00:06 Let's denote nts for neurotransmitters and these receptors are classified based on these molecules.

00:14 Neurotransmitters are small chemical molecules which are stored in bicycles in the presynactic neuron and they get diffused into the synapses and they are taken in the post -synactic neuron to cause an action potential.

00:28 Let's see the options one by one.

00:32 So option one discuss is about the metabotropic receptors.

00:36 Metabotropic receptors are one of the two types of neurotransmitter receptors and they function using a molecule called g -proton coupled receptors, written as gpcr.

00:49 And they require a signaling cascade in order to either open or close the channel.

00:56 Hence this option is correct.

00:58 Option 2 disk is about the amino acid receptors.

01:03 So these amino acids are small molecules and they come under the category of neurotransmitters, but they are not a type of receptor.

01:13 Hence, this option is incorrect.

01:16 Option 3, disk is about the ionotropic receptors.

01:21 These ionotropic receptors are one of the two types of neurotransmitter receptors and they also, called as ligand -gated ion channel because they require a ligand molecule either to open or close the channels so these ligand molecules can also be ions at times hence this option is also correct option for disk is about the small molecules receptor here the term small molecules denote the one of the few types of the neurotransmitters hence here the term small molecules denotes the neurotransmitter type but not the receptor type.

02:05 So these amino acids and small molecules can be transported and like function as a neurotransmitter either using these metabotropic or ionotropic receptors only.

02:19 Hence the correct answer are the metabolropic receptors and ionotropic receptors which are the two types of neurotransmitter.

02:28 Receptors.

02:31 Question 9 discusses about the effects of the ionotropic receptors over the metabotropic receptors.

02:39 So let's see the option one by one.

02:42 Option one discusses about the effects being delayed in nature when compared to the metabotropic receptors.

02:50 This is actually incorrect because delayed response is a characteristic features of a metabotropic receptors.

02:57 Let's denote it as m.

02:59 Hence this option is incorrect.

03:02 Option 2 discuss about the effect being fast in nature.

03:08 This is a characteristic feature of ionotropic receptors.

03:11 Let's denote it as irr here.

03:14 The action is fast because these are small molecules and can be transported very quickly and so the action is and so the effect is fast in nature.

03:24 Hence this option is correct.

03:27 Option 3 disc is about...

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