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The internal composition of the cell is maintained because the plasma membrane is selectively permeable to small molecules. A lot of biological molecules are unable to distribute by the phospholipid bilayer so the plasma membrane develops a barrier which blocks the free exchange of molecules between the cytoplasm and the external environment of the cell. Exact transport proteins carrier proteins and channel proteins then mediate the careful passage of small molecules across the membrane, permitting the cell to control the composition of its cytoplasm.
What are the chemical elements that form most of living biological matter? The elements are:- a) oxygen (O), b) carbon (C), c) hydrogen (H) and d) Nitrogen (N).
What is the difference between the endocrine gland and the exocrine gland? Endocrine gland is a gland whose secretions (known as hormones) are collected by the blood and reach
In the preceding section we emphasised the fact that cvolution or the continuous adaptations to the environment can take place only when pheiiotypes exhibit variability. In the abs
How potassium is essential for the following physiological functions It is vital for photosynthesis. When K + ion is deficient, photosynthesis declines and respiration incr
During a routine annual physical,a patient was checked to determine the amount of glucose in the blood.After the assay,It was found that the glucose that the glucose concentration
According to the Nernst equation, the equilibrium potential for any ion (Eion) distributed across a membrane is dependent on the internal (Ionin) and external (Ionout) concentratio
What is the function of the citric acid cycle? The hnction ofthe citric acid cycle can be discussed as follows. The intermediates of citric acid cycle are used as precursor
Explain about the Vitamin D? Vitamin D is a generic term and indicates a molecule of the general structure with rings (A, B, C, D), as you may have noticed in Figure B. The ri
Q. Illustrate about Components of an Angioplasty System? 1) Guiding catheter: The ideal guiding catheter must have a lumen diameter i.e. at least twice that of the diagnostic c
Q. What is cross contamination? Cross contamination is the passage of micro-organisms from one person to another via any route direct or indirect.
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