Both plant and animal cells are eukaryotic, so they contain membrane-bound organelles like the nucleus and mitochondria. The nucleus of eukaryotic cells is similar to the brain of the cell. It contains the genetic information (DNA) and directs the cell how to function. What is the location and function ofRead More →
The ribosome is a complex molecule made of ribosomal RNA molecules and proteins that form a factory for protein synthesis in cells. In 1955, George E. Palade discovered ribosomes and described them as small particles in the cytoplasm that preferentially associated with the endoplasmic reticulum membrane. Where are ribosomes firstRead More →
Fuel cells can be used in a wide range of applications, including transportation, material handling and stationary, portable, and emergency backup power. Hydrogen can be used in fuel cells to generate power using a chemical reaction rather than combustion, producing only water and heat as byproducts. What is a fuelRead More →
During T cell differentiation, the naive T cell becomes a blast cell that proliferates by clonal expansion and differentiates into memory and effector T cells. Many subsets of helper T cells are created during T cell differentiation and perform vastly different functions for the immune system. Do T cells replicate?Read More →
All cells are surrounded by a cell membrane. The. cell membrane is semipermeable, allowing some substances to pass into. the cell and blocking others. What surrounds the outside of all cells? Cell membrane (plasma membrane) The thin layer of protein and fat that surrounds the cell. Do all cells haveRead More →
With less oxygen, the abnormal hemoglobin S gene can cause rigid, nonliquid protein strands to form within the red blood cell. These rigid strands can change the shape of the cell, causing the sickled red blood cell that gives the disease its name. Which clients are at high risk forRead More →
Pressure Potential Positive pressure inside cells is contained by the cell wall, producing turgor pressure. Pressure potentials are typically around 0.6–0.8 MPa, but can reach as high as 1.5 MPa in a well-watered plant. What is the osmotic pressure of a plasmolysed cell? The extent of plasmo- lysis is thusRead More →
In a galvanic cell, electrons will move in to the anode. Since electrons carry a negative charge, then the anode is negatively charged. Same thing with the cathode. It’s because the protons are attracted to the cathode, so it’s mainly positive, and therefore is positively charged. In which cell cathodeRead More →
Explanation: It is because in primitive earth , there was lack of oxygen as only the four were mainly present that include hydrogen , ammonia ,metane and water vapours . Also oxygen was only present in form of water molecule at that time . Thus we can say the firstRead More →
The descriptor can apply to objects of different types, including cells, where one mechanism of crenation is the contraction of a cell after exposure to a hypertonic solution, due to the loss of water through osmosis. … As a result, the cell shrinks and the cell membrane develops abnormal notchings.Read More →