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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.
Q. Explain States of matter Ans. Chemistry deals with the nature and composition of matter - anything that occupies space and has mass, and the changes which it undergoes. Matt
Nucleic acid hybridization: This is a process by which a suitably labeled DNA or RNA from a known infectious agent is used to probe its complementary sequence unique to t
Arteries - Circulation The arteries deliver blood from the heart. Figure shows the structure of arteries and the different layers of the vessel wall. The thick walls of these
Question 1 How would you perform prothrombin time (PT) test? What are the precautions to be taken while performing the test to avoid errors? List various factors that affect the a
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What is succession?
What do we mean by the term isomer? Existence of different compounds having same molecular form but dtfferent structural forms are isomers. Monosaccharides exhibit a varie
Gene expression must begin with the process of transcription a) Describe the promoter motifs commonly associated with eukaryotic protein-coding genes, and explain their influen
Q. What are the functions of the osseous tissue? The main functions of the osseous tissue that are to provide structural rigidity to the body and to delineate the spatial posit
Meaning of Behaviour Change Communication Now day's very common term used for giving health education to people and for giving information to bring change in behaviour is Behav
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