Which of the following contributes most directly to the hardness of bones? 1) hydroxyapatite 2) periosteum 3) articular cartilage 4) osteoid

The correct option is number 1. Hydroxyapatite contributes most directly to the hardness of bones

Explanation:

Hydroxyapatite can be described as a naturally occurring biological molecule of high importance. It provides hardness the bones and teeth. Hence, option 1 is correct.

Periosteum can be defined as the outer layer of a bone which functions as an attachment site for the skeletal muscles. Osteoid is a structure that is made before a bone occurs in its mature form. Hence all the other options 2, 3 and 4 are false.

answer: c.

explanation:

the cells uses some of the atoms of the glucose molecules to atp molecules. the atoms of the glucose molecules will then be converted into energy which will be eventually stored in atp. the energy produced which are stored in atp are coming from the glucose’s chemical bonds.