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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.
Mention where the following are located in the human brain, and give single function of each: a) Temporal lobe b) Cerebellum c) Corpus callosum
What is Calvin Cycle? The dark reactions of photosynthesis are also known as the Calvin cycle. This process synthesizes glucose molecules using carbon dioxide from the atmosphe
Basic Structure of Heart The heart is small organ about the size of one's fist, located in the middle and slightly to the left of the mediastinum in the chest. The wider t
What is Lymphatic System in human biology? The lymphatic system maintains fluid balance and serves in protecting the body from disease. The primary organs of the lymphatic syst
Histone methyl transferases (HMTs) having a protein domain called SET. This domain is responsible to adding methyl groups to histones. Which of the following is a false statement r
What are protein hydrolysates? Proteins that have been treated with enzymes to break them down into amino acids or shorter peptides are referred to as protein hydrolysates. Pr
Mechanism of Carcinogenesis In the preceding sub-section you learnt that carcinogenesis is a multistep process. Even though cancer may be caused by many agents chemical, p
Determine Food Sources of ascorbic acid (vitamin c)? Food sources of vitamin C include: Rich sources: Amla and guava. Good sources: Drumstick leaves, other leafy ve
Q. What is the vector of Chagas' disease? How is the disease transmitted? The vector of the Chagas' disease is its intermediate host, a triatomine bug. The key species is Triat
Suppose you were planning to use liposomes in an attempt to deliver drugs to a particular type of cell in the body, for example, a fat or muscle cell. Is there any way you might be
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