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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.
OSTEOPORASIS - Reduction in bone tissue mass causing weakness of skeletal strength. It leads to crush fracture. It occurs in pastmenopausal women & elderly man. Common
What is the water cycle? The water cycle represents the circulation and recycling of water in nature. Liquid water on the planet surface is heated by the sun and turns into
How are the symmetry and the nervous system characterized in echinoderms? Adult echinoderms, with cnidarians, are the animals that present radial symmetry, i.e., their body str
METHODS OF EVALUATION: The two main areas of evaluation include a) evaluation of job performance of individual b) evaluation of programme agency 1) Evaluation of the
Senescence Plants begin their development after seed germination. They grow, flower and finally senesce and die. The period from the start to death is called the longevity or
Plant Water Role of Water in Plants You know that water is the main constituent of plant cells. It performs the following major functions Water as a Solvent Water is a v
What event marks the beginning of the menstrual cycle? What is the blood concentration of FSH, LH, estrogen and progesterone in this phase of the cycle? By convention the menst
EXTERNA L EAR - It is an oval shaped, some what funnel like, skin covered flap of elastic cartilage and muscles. It's outer stiff ridge is called hellix. Lower flexibl
Q. Differentiate between adult and infant botulism? • Adult Botulism is prevalent amongst adults whereas Infant Botulism is prevalent in infants of less than one year of age.
Dendrology : This is the study of all kinds of trees. Dendrology we can also say it xylology it is the science or study of wooded plants like trees, shrubs, and lianas. There is no
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