The study of structures of organisms, their cells and their organelles at molecular level is known as A. Molecular biology B. Environmental biology C. Microbiology D. Cell biology

The correct answer is: A. Molecular biology

Molecular biology is the study of the structure, function, and behavior of biological molecules, including DNA, RNA, proteins, and carbohydrates. It is a multidisciplinary field that draws on chemistry, physics, and biology to understand the molecules that make up living things.

Molecular biology is a rapidly growing field with many important applications in medicine, agriculture, and biotechnology. For example, molecular biologists are working to develop new drugs and treatments for diseases, to improve crop yields, and to create new biofuels.

Here is a brief explanation of each option:

• A. Molecular biology is the study of the structure, function, and behavior of biological molecules, including DNA, RNA, proteins, and carbohydrates. It is a multidisciplinary field that draws on chemistry, physics, and biology to understand the molecules that make up living things.
• B. Environmental biology is the study of the interactions between organisms and their environment. It includes the study of the physical environment, such as climate and soil, as well as the biological environment, such as other organisms and the food web.
• C. Microbiology is the study of microorganisms, which are organisms that are too small to be seen with the naked eye. Microorganisms include bacteria, viruses, fungi, and protists.
• D. Cell biology is the study of cells, the basic units of life. Cell biology includes the study of the structure, function, and behavior of cells.