Answer:
diverse proteins embedded in a phospholipid bilayer
Explanation:
According to fluid mosaic model the cell membrane is made of bilayer of phospholipid. Many proteins are embedded in this bi layer. Carbohydrate and cholesterol are also found in different forms. Carbohydrate can either be attached to the embedded protein in which case it is called as glycoprotein or it can be connected to the lipid molecule in layer and called as glycolipid.
Proteins can be found in two forms too. They can either be embedded in the layer i.e. they can penetrate single or both layers. These proteins are called as integral proteins. They can also be present on one side of the membrane and not penetrate the lipid bilayer in which case they are called as peripheral proteins.
Both types of tissues are made of differentiated cells that have a specific function.
Both types of tissues contain cells that lost the ability to divide
Answer:
Option A. amphipathic molecules
Explanation:
Amphipathic molecules have both polar and non-polar parts which means they contain hydrophilic and hydrophobic regions in their structure.
These molecules are found in lipids. More specifically, phospholipids are considered as the fundamental building block of the cell membrane. They are arranged in a bi-layer having a hydrophilic head and hydrophobic tails to maintain the fluidity of the membrane.
Answer:
Jawless fish was present before vertebrates.
Explanation:
Jawless fish has some characteristics of vertebrates and also considered as the ancestor of vertebrates on earth which is similar in appearance with the hagfish. It was present about 500 to 600 million years ago. They consist of cranium but vertebral column is absent. but with the passage of time, evolution occurs and many animals which was the descendant of this jawless fish having vertebral column or backbone in their body.
The answer is the cell membrane in animal cells.
