Explanation

Catalase is most active around pH 7, which is neutral and reflects its optimal working conditions.

Explanation

After an enzyme-catalyzed reaction, the enzyme is used for another reaction as enzymes are not consumed in the process.

Explanation

A motor neuron carries impulses from the CNS to muscles, causing them to contract.

Explanation

The diffusion of sodium ions across the postsynaptic membrane causes it to depolarize, initiating a new action potential.

Explanation

Spindle fibers attach to the centromere of a chromosome during cell division, specifically at the kinetochore, which is a part of the centromere.

Explanation

The peptidoglycan cell wall is a unique and defining feature of bacteria.

It provides structural support and protection, helping bacteria maintain their shape.

Peptidoglycan is not found in amoeba, protozoa, or viruses, as these organisms have different structural components.

Explanation

Steroids are lipids that do not contain fatty acids.

They have a structure composed of four fused carbon rings (steroid nucleus) and are involved in various biological functions, such as hormones (e.g., cholesterol, testosterone, and estrogen).

Other lipids like neutral lipids, phosphatidic acids, and waxes do contain fatty acids in their structures.

Explanation

Sugarcane primarily contains sucrose, which is a disaccharide made up of glucose and fructose.

It is the main sugar extracted from sugarcane.

Explanation

Sickle cell anemia is caused by a mutation in the gene that codes for the beta-globin chain of hemoglobin,

where valine is substituted for glutamic acid at the sixth position, causing the red blood cells to assume a sickle shape.

Explanation

Globular proteins are not abundantly found in hair.

Instead, fibrous proteins like keratin are found in hair.

Globular proteins are spherical in shape, have polypeptide chains, and are typically soluble in water.