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

 

The blood protein Albumin regulates the amount of water in plasma.

Every ecosystem must have Autotrophs.

The support cells of the nervous system are Glia, also called glial cells or neuroglia. In the central nervous system, there are four types of supporting cells. They are ::

* Astrocytes

* Microglial cells

* Ependymal cells

* Oligodendrocytes

The average Life span of RBC is 120 days.

The correct pairing of DNA bases among the given options is guanine - cytosine.

A molecule of DNA is a polymer composed of nucleotides. Each nucleotide is composed of a nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group.

Chloroplasts are organelles found in plant cells and eukaryotic algae that conduct photosynthesis. Chloroplasts absorb sunlight and use it in conjunction with water and carbon dioxide gas to produce food for the plant.