Answer:
The polar head groups of phospholipids interact with water while the hydrophobic hydrocarbon tails are packed away from the water.
Explanation:
A phospholipid contains glycerol to which hydrocarbon tails are bonded. These hydrocarbon tails make the hydrophobic region of the phospholipids and are packed away from the water to make the inner core of the membranes. Glycerol of a phospholipid also has a phosphate group attached to its third carbon. The phosphate and glycerol moiety together make the hydrophilic head part of the phospholipid and interact with the surrounding water.
Answer:
Saliva contain enzymes.
Explanation:
In the mouth, when chewing a bite of bread, it mixes with the saliva in the mouth which is secreted by the salivary gland. The food is broken down by chewing which is converted into Bolus through the saliva. The saliva comprises of digestive salivary amylase which help to digest carbohydrates and breakdown carbohydrates into smaller pieces.
Bread is a carbohydrate, digestive salivary amylase breakdown bread into sugars.
Therefore, digestion begin from the mouth and it contain saliva which comprises of the enzymes.
To reproduce (asexually). Most unicellular organisms only live for mere hours. The best bet for the species to survive and thrive as a whole is for them to reproduce, or replicate.
