Explanation

Explanation

HIV is a reverse transcribing diploid single-stranded RNA virus that uses reverse transcriptase to convert RNA into DNA.

This mechanism is key to its replication within the host cells.

Explanation

The accumulation of 'lactic acid' in the muscles results in extreme fatigue.

This buildup occurs during anaerobic respiration when oxygen levels are low.

It leading to muscle soreness and decreased performance.

Explanation

The cell wall is the outer covering of a cell, present adjacent to the cell membrane, which is also called the plasma membrane.

As mentioned earlier, the cell wall is present in all plant cells, fungi, bacteria, algae, and some archaea.

Explanation

 Centrioles are composed of nine triplets of microtubules arranged in a cylindrical structure.

Each triplet consists of three microtubules arranged in a cylindrical fashion.

So, overall, a centriole consists of a total of 27 microtubules organized into nine triplets.

Explanation

The middle lamella is a pectin layer that cements the cell walls of two adjoining plant cells together.

It's made up of calcium and magnesium pectate.

Explanation

The common cold is caused by a viral infection, primarily by rhinoviruses.

Cholera and typhoid, in contrast, are caused by bacterial infections.

Explanation

The correct option about a chlorophyll molecule is methyl group on second pyrrole ring.

Chlorophyll molecules have a porphyrin ring structure, and in chlorophyll a, there is a methyl group attached to the second pyrrole ring.

Explanation

Lysozymes are required during the penetration step of the bacteriophage infection process.

They break down the bacterial cell wall.

It allowing the phage to inject its genome into the host cell.

Explanation

The complete, mature, and infectious particle of a virus is known as a virion.

It consists of the viral genome enclosed in a protein capsid and sometimes an envelope, making it capable of infecting host cells.