Explanation

Most people are born with 12 ribs on each side of the body, making a total of 24 ribs.

Some people are born with more than 24 ribs.

These extra ribs are called supernumerary ribs.

When people are born with less than 24 ribs,

it is called agenesis of the ribs.

Explanation

- The elementary charge on a single electron is -1.6 × 10⁻¹⁹ coulombs.

- It’s a fundamental physical constant.

Explanation

 Prokaryotic cells lack membrane-bound organelles like chloroplasts.

Chloroplasts are organelles found in eukaryotic cells, specifically plant cells, and are responsible for photosynthesis.

Prokaryotic cells, while simpler in structure, do possess other components such as"

• Ribosomes (for protein synthesis)
• A cell wall (for structural support)
• DNA (although not contained within a nucleus) 

Explanation

The velocity of an electron is maximum in 1st shell

because according to Bohr's model

So we have velocity of electron = 2.188 ×10^6 m/s.

By calculation, we gained velocity= 1.094×10^6 m/s.

So it is determined that the velocity is decreased as we move from lower to higher shell

Explanation

Melting ice below 0°C by applying pressure is a spontaneous physical change. 

Physical change:

This is correct because the process only changes the state of water from solid to liquid, without altering its chemical composition. 

Spontaneous:

• Under the applied pressure, the ice will naturally melt even below 0°C.
• A spontaneous process occurs without any external energy input. 

Explanation

 A buffer is a solution that resists change in its pH. 

A buffer solution is composed of a weak acid and its conjugate base (or a weak base and its conjugate acid).

When a small amount of a strong acid or base is added to a buffer,

The added ions react with the components of the buffer to maintain a relatively constant pH. 

Explanation

The increase in the rate of reaction due to an increase in temperature is due to two main factors:

• Increased energy: As temperature increases, the particles gain kinetic energy, allowing them to move faster and collide more frequently.
• Successful collisions: The increased energy also leads to a greater likelihood of successful collisions, where the particles have sufficient energy to overcome the activation energy barrier and react.

Explanation

The liver performs a relevant FUNCTION in retaining blood glucose levels.

Following intake of food, extra glucose may be saved in the liver as glycogen .

This is inspired by insulin release.

Explanation

If the activation energy is increased, the rate of reaction decreases. 

Activation energy is the minimum amount of energy needed for reactants to overcome the energy barrier and proceed to form products.

A higher activation energy means that fewer molecules have the necessary energy to react, resulting in a slower reaction rate.

Conversely, a lower activation energy means more molecules can overcome the barrier and react faster. 

Explanation

The covalent bond between glucose and fructose, forming sucrose, is called a glycosidic bond, specifically a 1-2 glycosidic linkage.

This bond is formed through a dehydration reaction where a water molecule is removed when the two monosaccharides join.