Answer: The correct answers are 1) Endocytosis and 2) Receptors are specific for the cells.
White blood cells are specialized cells of the immune system. They play important role in protecting body from foreign agents like bacteria . For this, they recognize the bacteria and forms a covering around it, pinching off the vacuole. By this, the cell performs a process called as Endocytosis ( specifically phogocytosis).
The receptors present on the white blood cells are quite specific. Due to this, they recognize specific foreign particles. For example B- cells produce antibodies which bind to specific antigens ( foreign protein) and therefore mount specific immune response. In other words, specific foreign particles are recognized by specific white blood cell. This indicates that the receptors on these cells are specific.
Thus, the correct answer is 1) Endocytosis and 2) Receptors are specific for the cells.
A molecule is a chemically aggregate of at least two atoms linked to each other by covalent bonds. Almost all conventional matter on Earth is made up of molecules. Individual atoms are rarely found. A molecule is the smallest amount of a compound that can exist and still exhibit the chemical characteristics of that compound. For example, oxygen and hydrogen atoms are bonded together in a water molecule.
On the other hand, a compound is a substance containing two or more elements formed by a chemical reaction that bonds their atoms together.
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Petroleum, also called crude oil, is a fossil fuel. Like coal and natural gas, petroleum was formed from the remains of ancient marine organisms, such as plants, algae, and bacteria.
Hydrolysis is the term that when literally broken down means water splitting, splitting using water.
