Still for others, life is all about art. For many life is all about love. For a few, life is all about religious practices. For philosopher like Aristotle life is about happiness: "Happiness is the meaning and the purpose of life, the whole aim and end of human existence." and my life is boring ._.
Life is defined as the following, the condition that distinguishes animals and plants from inorganic matter, including the capacity for growth, reproduction, functional activity, and continual change preceding death.
Parallel venation is a kind of venation in which the veins runs parallel to the to the length of the leaves from its base of the leaf to the apex of the leaf or the tip of the leaf.
It is a characteristics of many monocot plants.
Few example of plants having parallel venation are grasses, bamboo, rice, corns, banana, musa, canna, etc.
During cell differentiation, new proteins are expressed
During cell differentiation, some genes are silenced while some or expressed. Different cells differentiate differently depending on the type of cell is going to become. This is why even though all the cells in a multcellular organism have the same DNA, they become different organ systems that look different.
Explanation:
Different differentiated cells produce different proteins because they express different genes. For example Cells of the epidermis of the skin express the genes for producing keratin (the pigment molecule) while those in the dermis do not express this protein because this gene is silenced in dermis cells. In addition, in dark-skinned people, these genes are more expressed that in people with light skin.
