Daily NEET MCQ- September 3, 2022 - NEET MCQ

One mole is the amount of a substance that contains as many particles as there are atoms in exactly 12 g of the carbon atom. So S.I. the system took mole as the seventh base fundamental quantity (symbol = mol).

Avogadro number denoted by N_A. Its value is 602213670000000000000000, also written as 6.022×10²³. It’s the number of entities in 1 mol of a substance. The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance.

One mole of any substance contains Avogadro’s number of particles. Its value is 6.022×10²³ atoms. But here it’s given 12.044 x 10²³ atoms, thereby dividing it by Avogadro’s number; 12.044 x 10²³ atoms/6.022×10²³ atoms = 2 moles. Hence it contains 2 moles of oxygen.

Kilogram is the standard unit of measurement of mass. Pound and gram are also units of mass nut are not standard. Dozen is a unit of measurement of quantity.

Mass is the amount of matter in a body. Amount of space covered by a body is called volume. Amount of time and weight do not have any physical significance.

Mass is used to measure matter. Hence, the units to measure matter are same as the ones used to measure mass. Among the available choices, kilogram can be used to measure mass. Therefore, kilogram can be used to measure matter.

When a neurotransmitter binds to a receptor on the post-synaptic membrane, it leads to the opening of ion channels. This allows the entry of ions which results in the generation of a new action potential.

The post-synaptic membrane contains receptors. These are receptors for the neurotransmitters which are released from the pre-synaptic membrane at the terminal end of the adjacent neuron.

During an action potential, the synaptic vesicles move towards the membrane of the neuron and fuse with the plasma membrane. This results in the release of neurotransmitters in the synaptic cleft.

Neurotransmitters are chemical compounds that help in the transmission of nerve impulses or action potentials. Nissl’s granules, Schwan cells and synaptic knobs do not participate in this process.