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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.
Explain some Do's and Don'ts when working in Laboratory? 1) Always wear a lab coat when working a laboratory. 2) Ensure that no harm is caused to yourself or the people work
What is Photosynthesis ? Photosynthesis is the method by which plants trap radiant energy from the sun and convert the energy into a biochemical form. This biochemical energy
Testing for urine sugars is not recommended for either diagnosis or monitoring of patients with diabetes. This is because a urine sugar is not a reliable test. When no facilities a
Q. Do plants have tissue organization and specialized organs? Plants have specialized organs (like roots, limbs, reproductive organs, leaves) and differentiated tissues (suppor
Analyse the model that highlights the factors which influence the environmental impact of a population
What part do (a) nitrifying, (b) nitrogen-fixing and (c) denitrifying bacteria play in the nitrogen cycle? a) Nitrifying bacteria in the soil change ammonia and other nitrogeno
Describe Respiratory System? The respiratory system is responsible for the transport of oxygen and carbon dioxide from outside the body to and from the blood. This process is c
What are the general symptoms of brain tumors The general symptoms of brain tumors, which result from increased intracranial pressure, include headache, vomiting, swelling of t
External factors - Factors Controlling Metamorphosis in Insects In few cases an external factor may be accountable for initiating moulting, as for instance in the blood su
Q. How Genes can be exchanged between chromatids? When two homologous chromosomes physically exchangecorresponding segments during prophase I of meiosis, geneticists call it cr
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