What is Photosystem 1 (PS1)? What is Photosystem 2 (PS2)? Difference between Photosystem 1 (PS1) and Photosystem 2 (PS2) Feature Photosystem I (PSI) Photosystem II (PSII) Location in Thylakoid Membrane Outer surface Inner surface Photocenter P700 P680 Absorbing Wavelength >680 nm <680 nm Photophosphorylation Both cyclic and non-cyclic Only non-cyclic Photolysis of Water No Yes … Read more
What is Golgi Body (Golgi Complex)? Definition of Golgi Body (Golgi Complex) The Golgi body, also known as the Golgi complex or Golgi apparatus, is a membrane-bound organelle found in most eukaryotic cells. It functions primarily in the processing, packaging, and distribution of proteins and lipids, which are transported in vesicles to various destinations within … Read more
What is Cellular Junctions or Cell junction? Definition of Cellular Junctions or Cell junction Cellular junctions, or cell junctions, are specialized structures in eukaryotic cells that facilitate adhesion and communication between adjacent cells or between a cell and the extracellular matrix. These junctions are essential for maintaining the structural integrity of tissues and enable coordinated … Read more
Molluscs, also known as mollusks, are soft-bodied, symmetrical, segmented and coelomate mammals. They are usually shelled with a mantle.
What is antiseptic? Types and examples of Antiseptics Antiseptics, integral to infection control, are classified into various types based on their chemical composition and specific applications. Uses of antiseptics Antiseptics play a crucial role in preventing and controlling infections in various settings. Their applications are diverse, ranging from medical procedures to everyday first aid. What … Read more
Bacteria cells. The most visible part of the majority of plants is a massive, fluid-filled vacuole.
What are Peroxisomes? Peroxisomes, identified as membrane-bound cell organelles in eukaryotic cells, were first described by J. Rhodin in 1954 and subsequently recognized as cell organelles by Christian de Duve in 1967. These organelles, small vesicles containing digestive and oxidative enzymes, play a pivotal role in cellular metabolism. They are integral in converting hydrogen peroxide … Read more
The cGMP pathway, short for cyclic guanosine monophosphate pathway, is a crucial signaling mechanism in cells. It involves the synthesis of cGMP from GTP (guanosine triphosphate) through the action of the enzyme guanylate cyclase. cGMP acts as a secondary messenger, similar to cyclic AMP (cAMP), and plays a vital role in various physiological processes. One … Read more
What is Oxidative Phosphorylation? Definition of Oxidative Phosphorylation Oxidative phosphorylation is a metabolic process that occurs in the mitochondria, where energy derived from the electron transport chain is used to produce adenosine triphosphate (ATP) from adenosine diphosphate (ADP) and inorganic phosphate, with oxygen acting as the final electron acceptor. Sites of oxidative phosphorylation in ETC … Read more
What are Centrioles? Definition of Centrioles Centrioles are cylindrical, microtubule-based structures found in most eukaryotic cells, playing a crucial role in cell division by aiding in the formation of the spindle apparatus and in cellular processes like the formation of cilia and flagella. They are typically composed of nine sets of microtubule triplets and lack … Read more
What is Yeast? Definition of Yeast Cell A yeast cell is a single-celled, eukaryotic microorganism belonging to the fungus kingdom, characterized by its ability to ferment sugars into alcohol and carbon dioxide. It is widely used in baking, brewing, and biotechnological industries. Yeast cells vary in size and shape, reproduce mainly asexually through budding, and … Read more
What are Macrophages? Definition of Macrophage A macrophage is a type of white blood cell found in the immune system, known for its ability to engulf and digest cellular debris, foreign substances, and pathogens. It plays a crucial role in both innate and adaptive immunity, aiding in defense against infections and in tissue repair. Structure … Read more
Ribosomes, sometimes referred to as Palade granules (after the discovery of George Palade and due to their granular shape) are macromolecular devices which are present in every cell, and that carry out biochemical protein synthesizing (mRNA translation).
What is the Endoplasmic Reticulum? Endoplasmic Reticulum (ER) Definition The endoplasmic reticulum (ER) is a large, membrane-bound organelle found in eukaryotic cells. It plays a crucial role in the synthesis, folding, modification, and transport of proteins and lipids. The ER is divided into two types: the rough ER, studded with ribosomes and involved in protein … Read more
Cell biology describes the nucleus is the big organelle, with a membrane-bounded structure that holds the genetic material form of numerous linear DNA molecules arranged into chromosomes, which are the structures that make up the nucleus. In the field of cell biology, the nucleus’s function is to serve as the central point of control for the cells. This is due to the fact that it holds the genetic material that code for the essential functions of cells.
What are lipids? Classification of Lipids Based on the Chemical Composition 1. Simple Lipids Simple lipids are fundamental components in the realm of biological molecules. They primarily consist of neutral fats and oils, as well as waxes. These lipids play crucial roles in various biological processes, especially in energy storage and insulation. 2. Compound Lipids … Read more
It is common to discuss fat as if it was a villainous substance that is bent to destroy our diets. However, they are beautiful tiny molecules composed of three hydrocarbon tails that are attached to a small coathanger-like molecule known as Glycerol. Similar to the other big organic molecules they perform crucial functions in the biology of both humans and other living things. (Also numerous recent diet studies suggest that sugar can cause many more health issues that fat!)
Proteins, as complex biological molecules, play an essential role in the myriad of processes in living organisms. Consisting of amino acids, proteins can be envisioned as polypeptide structures formed through long chains of these amino acid residues. Therefore, it’s not surprising that they are one of the most abundant organic molecules present in living beings. … Read more
What are Protein Synthesis Inhibitors? Types of Protein synthesis inhibitors On the basis of target organisms inhibitor of protein synthesis is categories as follows- 1. Acting only on prokaryotes 2. Acting on prokaryotes and Eukaryotes 3. Acting only on Eukaryotes Mechanism of Protein synthesis inhibitors Protein synthesis, a core biological process, occurs at the ribosomal … Read more
Proteins are the largest macromolecules in biology, found throughout every cell. They are also the most adaptable organic molecule in living system and is found in a many various kinds that range in size from small polymers to huge peptides. Proteins are polymers composed of amino acids, which are connected by peptide bonds. Proteins, the protein building blocks are the naturally occurring twenty amino acids. Proteins are, therefore, the multimers made up of amino acids.
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