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Photoreceptors
Photoreceptors are concerned in absorption of light by photosensitive pigments. The chemical change involved produces the impulse concerned in the nerve cells. The pigments involved are carotenoid derivatives containing retinine (vitamin A aldehyde) combined with a protein (opsin). Rhodopsin is one of the general pigments. Simple eyes are extremely common; extremely differentiated compound eyes have evolved in many arthropods, and well differentiated camera type eyes, as comparable to vertebrate eyes occur in cephalopods. You will see among several non-chordates a variety of eyes ranging between these extremes. Simplest eyes in Platyhelminthes and annelids are in the form of pigment spots containing sensory cells associated with pigment cells. They serve differentiation of light from darkness. In several polychaetes they reach higher level of organization. The cup may often secrete a lens. The cephalopod eye is the result of highest elaboration of vesicular eye. Actually the eye in Octopus reaches the structural complexity of that of vertebrate eye, resembling it in considerable details. Though, the cephalopod retina is direct type with sensory ends of the receptor cells directed towards the source of light whereas the retina of vertebrate eye is inverted with the sensory ends turned away from the source of light.
What is adaptive convergence? The Adaptive convergence is the phenomenon by which living beings facing the same environmental pressure (problems) and undergoing genetic variabi
Shapes of viruses Viruses occur in a wide variety of shapes. Some are spherical or polyhedral . Some are helical appearing cylindrical or rod-like and other are complex. Virus
Most forms of cardiac diseases, like hypertension, valvular diseases and coronary artery diseases manifest as low output heart failure. Systemic vasoconstriction with cold extremit
Nutrient Availability You have seen that cation exchange plays an important part in nutrient availability to plants. Cation exchange functions in two ways as nutrients are rele
Most of the water taken up by a plant passes through it and is evaporated to the atmosphere.What use is made of the tiny fraction of this water which is retained by the plant?
You now want to express the gene in E coli, but unfortunately it has an intron in it that will not be processed out in bacteria, hence it must be removed. (a) Design P
Bacteria: Bacteria have a protective covering called 'cell wall'. Beneath this. there is a plasma membrane which encloses protoplasm of the bacterium containing various types
DEXTRIN Intermediate product of hydrolysis of starch. It consists of maltose & glucose. It is found in yeast & some bacteria.
How do homeotic genes regulate development in Drosophila? Homeotic genes code for regulatory proteins that are thought to control the rate of cell division in various body area
What are the processes that autotrophic beings use to produce organic material from inorganic substances? Autotrophic beings make organic material by photosynthesis or by chemo
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