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What is the function of keratin in the epidermis?
The epidermis is the outer layer of the skin made of epithelial tissue. In the epidermis there are keratin-secreting cells (keratinocytes). Keratin is an insoluble protein that impregnates the surface of the skin providing protection and impermeability. In mammals keratin also forms the hairs.
The keratinized cells of the skin surface make the corneal layer. These cells die and are continuously changed by others.
Q. (a) In droplet infection (i) where do the droplets come from, (ii) what infective agents might they contain? (b) Give two examples of diseases normally spread
Endocytosis is the uptake of extracellular macromolecules across the plasma membrane into the cell. The objects to be ingested is progressively enclosed by a small portion of
Some of the characteristics of Bt cotton are: 1. Long fibre and resistance to aphids 2. Medium yield, long fibre and resistance to beetle pests 3. High yield and produ
Which are the groups of living beings that form the protist kingdom? The protist kingdom contains protozoans and algae. (Two groups of fungi with same characteristics to protoz
Algae Advantages a) Produces proteins which have almost all the Essential Amino acids. b) Rich in tyrosine and serine, low in sulphur containing amino acids.
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Define Functions of sodium and chloride? So far you have learnt that most minerals participate in important functions of body as they support the activity of specific enzymes.
Explain the Skeletal System? Skeletal System: The support framework, or skeleton, in the human body is composed of mostly hard mineral substances. Unlike crustaceans or insec
Structure of the Sperm The spermatozoa in different animal groups display a wide variety of shapes and sizes but all share a. basic morphological plan. The sperm in most anim
Access through the crown Advantages : -Allow for better isolation with the rubber dam -Better esthetic anf functioning. -Good coronal seal between visits Limitations : -Proc
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