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Communicable diseases definition Communicable diseases are the diseases that are caused by infectious agents and can be transmitted from an infected person to other people, animals, or other sources in the environment. Communicable diseases are also called infectious diseases or … Read more
Celsius scale definition Celsius scale, or centigrade scale, is a temperature scale that is based on the freezing point of water at 0°C and the boiling point of water at 100°C. The scale was introduced by and also named after … Read more
Bone Definition A bone is a connective tissue where the living cells, tissues, and other components are enclosed within hard non-living intercellular material. The two important constituents of bone are collagen and calcium phosphate that distinguish it from other similar … Read more
Breathing Definition Breathing is a biophysical process that involves the exchange of gases through inhalation and exhalation. Breathing is also called ‘external respiration’ as it is an external process of taking oxygen in and throwing carbon dioxide out via respiratory … Read more
Biotic Factors Definition The biotic factor or biotic component is the living organism that shapes an ecosystem. Biotic factors include plants, animals, bacteria, algae, and all other living forms present in an ecosystem. An ecosystem is a complex system of … Read more
Bacteria Definition Bacteria are single-celled microscopic organisms that are characterized by the presence of incipient nucleus and few membrane-less cell organelles. Bacteria are diverse in shape, size, and color, and their habitats also vary ranging from soil, water, to the … Read more
Autotroph Definition An autotroph is a group of organisms capable of producing their own food by utilizing various substances like water, sunlight, air, and other chemicals. The autotroph is made up of two words; ‘auto’ meaning self and ‘troph’ meaning … Read more
Image Source: Encyclopædia Britannica, Inc. Created using biorender.com. Archaea Definition Archaea is a group of primitive prokaryotes that based on their distinct characteristics form a separate domain from bacteria and eukaryotes. The term ‘Archaea’ is derived from a Greek word, … Read more
Angiosperm Definition Angiosperms are the flowering plants that are the largest and most diverse groups of plants in the kingdom Plantae. These plants occupy about 80% of all green plants present on earth. Angiosperms are found in almost environments ranging … Read more
Amphibians Definition Amphibians are a group of cold-blooded vertebrates that are capable of exploiting both aquatic and terrestrial habitats. The term ‘amphibian’ is derived from the Greek word ‘amphibios’ which means living a double life. The term thus reflects the … Read more
Image Source: Biology Online and Lumen Learning. Agglutination Definition Agglutination is the process of clumping of antigens with their respective antibodies. Agglutination reactions are used to particulate test antigens that are usually conjugated to a carrier. The carrier can either … Read more
Aerobic Respiration Definition Aerobic respiration is a set of metabolic reactions that take place in the presence of oxygen, occurring in a cell to convert chemical energy into ATPs. Aerobic respiration takes place in all plants, animals, birds, and humans, … Read more
Acute disease definition Acute disease is a condition or a disorder that comes on or onsets rapidly and lasts for a shorter period of time. The period of time associated with acute diseases varies with the type of illness and … Read more
Absorption Definition Absorption, in biology, is the process of taking or assimilating substances into the cell or across the tissues by the process of diffusion or osmosis. Absorption of substances into a cell or tissue usually occurs through the general … Read more
Actin Definition Actin is a group of globular proteins that are the most abundant proteins in most eukaryotic cells and help in providing shape, structure, and mobility to the body. Actin is present in all eukaryotes except for the nematode … Read more
Image Source: AB Tasty. Type 1 error definition Type 1 error, in statistical hypothesis testing, is the error caused by rejecting a null hypothesis when it is true. Type 1 error is caused when the hypothesis that should have been … Read more
Streptococcus pneumoniae can be differentiated from Viridans streptococci by various features: S.N. Properties Pneumococcus Viridans streptococci 1 Morphology Lanceolate or flame-shaped Round/oval 2 Arrangement Gram-positive cocci in pairs Gram-positive cocci in long chains 3 Capsule Present Absent 4 On blood … Read more
Cilia and flagella are cytoplasmic processes extending from the cell surface. The cell organelles are similar but are differentiated based on their size, number, function and/or mode of beating. Here are the key differences between cilia and flagella S.N. Character Cilia Flagella 1. … Read more
Difference between O Antigen and H Antigen The surface structures of bacteria have considerable antigenic heterogeneity. Often these antigens are used as part of a serologic classification system for the bacteria. The classification of the 2000 or so different Salmonellae … Read more
Five species of Plasmodium are believed to cause malaria in humans: Plasmodium vivax, P. falciparum, P. malariae, P .ovale and P. knowlesi. Of the five species that infect humans, P. vivax and P. falciparum cause 95% of the total infections. S.N. … Read more
The saprophytic organisms which simulate the anthrax bacillus closely, both in their morphological and cultural characters within the group of Gram-positive aerobic sporing bacilli are termed as Anthracoid bacilli. They have a general resemblance to anthrax bacilli such as producing … Read more