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A pure phospholipid bilayer with its hydrophobic interior, is permeable to water and gases such as O2, CO2, N2 and small uncharged polar molecules such as urea, ethanol, but is impermeable to large uncharged polar molecules such as glucose, ions (Na+ , K+ , Cl-, Ca2+ ) and charged polar molecules instance for amino acids, ATP, glucose 6-phosphate. The initial group of molecules can cross a biological membrane unaided and without an input of energy, whereas the latter group requires the presence of integral membrane transport proteins and, in many cases an input of energy to travel by the otherwise impermeable membrane barrier. Thus the plasma membrane and the membranes of internal organelles are selectively permeable barriers and maintaining a distinct internal environment.
What are passive and active immunization? According to the duration of the protection how do these types of immunization differ? Active immunization is that in which an antigen
Q. Describe the Basic Mechanisms in Plaque Formation? In experimental models and human disease, the first morphologic phenomenon observed in plaque formation is adhesion of mon
write about asexual reproduction in mucor?
Historically what were the two main evolutionary theories? The two major evolutionary theories were darwinism and lamarckism.
Explain the Synthetic and natural materials of suturing 1. Most common are synthetic fibers: nylon, polyester, polyglactin (PG), and polyglycolic acid (PGA). 2. Natural: sil
Demonstrate the structure of mitochondria The structure of mitochondria has been examined in great detail with the aid of the electron microscope, and it is now possible to des
Restricted Food Items Foods to be avoided by diabetic patient are carbohydrate and fatty food. Carbohydrates are classified into sugars and starches. As you have studied in und
Definition of Epileptic seizures Epileptic seizures are classified as symptomatic seizures if they can be identified with a specific cause, such as infection, trauma, tumor, va
Which are the three parts of the small intestine? The small intestine is separated into three portions: duodenum, jejunum and ileum. Digestion System - Image Diversity: smal
Who first discovered eye anatomy?
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