Explanation

Transcription is the process where DNA is used to create mRNA.

Translation then follows, where mRNA is used to synthesize proteins in the cytoplasm.

Explanation

The speed of sound in water is approximately 1500 m/s, which is slower than in most solid materials but faster than in air.

This speed can vary slightly depending on factors like temperature and salinity.

Explanation

Gears work on the principle of transmitting rotational force from one gear to another.

This helps in changing the speed, direction, or torque in a mechanical system.

Explanation

Explanation

A neutral solution (pH 7) does not affect litmus paper, so both red and blue litmus remain unchanged.

Litmus paper changes color only in acidic (red) or basic (blue) solutions.

Explanation

According to the law of conservation of mass, the total mass of reactants equals the total mass of products in a chemical reaction.

Since no atoms are lost or gained, the mass of Fe₂O₃ (product) remains 320 grams, the same as the reactants.

Explanation

Heat transfer occurs through conduction, convection, and radiation.

Condensation is a phase change process (gas to liquid).

It is not a heat transfer method.

Explanation

It is estimated that around 14 muscles are involved when a person smiles.

Major muscles include the zygomaticus major and minor, which lift the corners of the mouth.

Explanation

An electrical impulse causes the cardiac cell's resting potential to convert into an action potential.

This action potential leads to contraction of heart muscle cells, enabling the heart to beat.

Explanation

Inertia is the property of an object to resist any change in its state of rest or uniform motion.

It is described in Newton’s First Law of Motion, also called the Law of Inertia.