Which are the special proteins in muscles that contract and relax to cause movement?

 

Sugar is a component of Carbohydrates.

Membrane bound organelles are not found in the cells of Prokaryotes whereas Eukaryotes have nucleus and membrane bound organelles.

For example : Bacteria is prokaryotic organism with lack of nucleus and membrane bound organelles whereas fungi is a eukaryotic with nucleus and membrane bound organelles.

The size of the pupil is controlled by the Iris when light enters the eye.

Aerobic respiration is the reaction takes place in presence of oxygen which quite opposite to anerobic. The direct result of aerobic repiration is ATP molecules from breakdown of glucose molecules.

Testosterone is the hormone which is associated with aggression.

The condition of blockage of the artery due to plaque deposition in the walls which can lead to stroke or heart attack is called Atherosclerosis.

Whereas,

The condition in which the stiffening or hardening of the arteries is called as Arteriosclerosis.