What is Simple Diffusion ? Simple diffusion is an unassisted type of diffusion in which a particle moves from a higher to a lower concentration. The directional movement through the concentration gradient is passive. Once the molecules become evenly distributed, the molecules on the either sides of the cell membrane achieve an equilibrium where no … Read more
Lysosomes Definition Lysosomes are dense granular membrane-bound structures that hold hydrolytic enzymes that are largely responsible for intracellular and extracellular digestion. The term “lysosome” is made up of two words: “lysis,” which means “breakdown,” and “soma,” which means “body.” It’s a crucial cell organelle that breaks down chemicals both within and outside the cell. Animal … Read more
What is Chromosome ? A chromosome is a thread-like structure made up of a single molecule of DNA (Deoxyribonucleic acid) and proteins that carries some or all of an organism’s genetic materials. It is found in the nucleus or nuclear region of the cytoplasm. Only during the metaphase of the cell cycle, when the chromosomes … Read more
Definition of a Simple Columnar Epithelium The simple columnar epithelium is a type of epithelium made up of a single layer of long, elongated cells found primarily in locations where absorption and secretion are important. The cells in the columnar epithelium, like those in the cuboidal epithelium, are changed to better suit the organ’s function … Read more
Meiosis Definition In sexually reproducing eukaryotes, meiosis is a type of cell division that produces four daughter cells (gametes), each with half the number of chromosomes as the diploid parent cell. The haploid cells become gametes, which determine sexual reproduction and the birth of a new generation of diploid creatures by fusing with another haploid … Read more
Definition of Aerobic Respiration Aerobic respiration is a series of metabolic events that occur in the presence of oxygen in order to transform chemical energy into ATPs in a cell. Except for certain early prokaryotes, all plants, animals, birds, and humans use aerobic respiration. In aerobic respiration, oxygen serves as an electron acceptor, allowing ATPs … Read more
Habitat Definition A habitat is a natural setting in which a certain organism lives and relies on its surroundings for survival, food, shelter, protection, and mating. The word habitat comes from the Latin word ‘habitare,’ which meaning ‘to occupy.’ The physical and biological aspects of an organism’s habitat define it. The nature of the soil, … Read more
Definition of Ribosomes The name ribosome is derived from two words: ribonucleic acid and ‘somes’, which is derived from the Greek word soma, which meaning “body.” Ribosomes are dense spheroidal particles with a diameter of 150 to 200 A0 found in most bacterial and eukaryotic cells. Protein synthesis takes place at these locations. They’re RNA … Read more
Monocot Leaves Definition Monocotyledonous plants have narrow, elongated leaves with parallel venation, which is used to distinguish them from dicots. Monocot leaves are isobilateral because the colour on both surfaces of the leaves is same. A proximal leaf base, or hypophyll, and a distal leaf hyperphyll make up the primordial monocot leaves. In dicots, the … Read more
Definition of Archaea Archaea is a group of early prokaryotes that form a unique domain from bacteria and eukaryotes based on their specific properties. The term “Archaea” comes from the Greek word “archaios,” which means “primitive” or “old,” implying the organisms’ primordial structure. Deep-sea vents, saline seas, hot springs, and even beneath petroleum deposits are … Read more