Avatar for Sourav Pan

Sourav Pan

Founder of Biology Notes Online, Biology & Microbiology Educator, M.Sc. in Microbiology
Expertise
Microbiology, Immunology, Cell Biology, Molecular Biology, Genetics, Biotechnology, Biochemistry, Botany, Zoology
Education
University of Calcutta
Profile Last Updated: August 10, 2026

Sourav Pan is the founder and sole author of Biology Notes Online. He holds a Bachelor of Science (B.Sc.) degree and an M.Sc. in Microbiology from the University of Calcutta. He creates educational resources covering microbiology, immunology, biotechnology, genetics, cell biology, botany, zoology, and other life-science subjects.

His goal is to make complex biological concepts easier to understand through well-structured, student-friendly articles based on academic textbooks, peer-reviewed research, and authoritative scientific sources. In addition to writing new content, he regularly reviews and updates articles to improve their accuracy, clarity, and educational value.

Primary vs Secondary Metabolites – Key Differences

Difference Between Primary and Secondary Metabolites

Primary metabolites are substances which are directly involved in the metabolic pathways of an organism , which are necessary to its development, growth and reproduction. They are a part of the physiological processes that occur within the organism. Primary metabolites are generated in the body during the growth phase due to the mechanism of growth. The phase of growth which is associated with the creation of primary metabolites is referred to as ‘trophophase’..

Diploid vs Haploid – Key Differences

Difference Between Diploid and Haploid - Diploid vs Haploid

In all organisms, somatic cells are diploloid, and sexual cells are typically haploid. The cells that are diploid have two homologous copies of two chromosomes inherited through two parental. The majority of mammals are diploid, with the exception of some rats. But, studies that have disproved that there is polyploidy among mammals have been conducted. Polyploidy is a condition where cells possess chromosomes which are more than diploid number of chromosomes. The majority of organisms that reproduce through mitosis have 2n DNA chromosomes, forming diploid cells.

Communicable vs Non-Communicable Diseases – Key Differences

Difference Between Communicable and non -communicable diseases

Also known as transmissible diseases, or infectious diseases, communicable diseases can also be called transmissible diseases. The infectious agent is transmitted to others by contact with bodily fluids, bodily fluids, bites of insects, and air. Infectious diseases can spread either directly or indirectly. Direct transmission means that the infectious agent is transmitted through close physical contact. In indirect transmission, it is spread through air, water or other vectors.

Breathing vs Respiration – Key Differences

Difference Between Breathing and Respiration - Breathing vs Respiration

Breathing is also known as ‘external respiration’ because it is an external procedure of bringing oxygen into the body and exchanging carbon dioxide through the respiratory organs. The breathing process in all vertebrates is comprised of a high-yielding tubes which connect the nose with the alveoli. Breathing is a continuous cycle in which the amount of respiratory cycles in a minute is referred to as breathing or the rate of breathing. Under normal circumstances the speed and the depth of breathing is controlled by various homeostasis processes to regulate the partial pressure of carbon dioxide levels in the blood.