Albinism is a recessive trait characterized by an absence of pigment melanin responsible for skin and hair color. Actually, albinism is caused by a defect in gene for enzyme which synthesizes melanin. The central dogma of molecular biology explains that the sequence of DNA specifies the sequence of mRNA, which, further, specifies codes for the sequence of proteins. Since a gene is a segment of DNA, altered gene will cause altered mRNA which will cause altered protein. Thus, <span>defect in gene for enzyme which synthesizes melanin will cause the absence of melanin and consequently, albinism.</span>
In coniferous forests, the terrestrial biome receives precipitation of up to 300 to 900 millimeters (mm) each year.
Coniferous forests mainly consist of conifers and grow trees that produce thick needles and cones instead of growing flowers and leaves.
These are evergreen plants and stay green, healthy, and sustainable all year long.
In spite of flowers, these trees bear needles annually.
Moreover, conifers are very adaptive trees that can grow in very cold and dry climate zones.
It is due to their adaptability that they can survive all year long without losing a life.
Siberian fir, Dahurian, and Siberian larches are examples of confer forests.
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<span>Nicotinic acetylcholine receptors (nAChR), are <span>ligand-gated ion channels and they can be a Na+, K+ and Ca2+ ion channel. Since nifedipine is a Ca2+ channel blocker (Ca2+ channel antagonist), it might inhibit the response of acetylcholine (if its receptor is Ca channel).</span></span>
The answer is
D. another natural disturbance
