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What is the phenomenon known as "red tide"? Which ambiental harms can it cause?
Red tide is a phenomenon that happens when dinoflagellates (algae from the pyrrophyte group) proliferate excessively in the ocean. These algae liberate toxins that affect the nervous system and can cause death when ingested by marine animals and by humans that eat infected animals.
How can coacervates be formed of phospholipids or polypeptides? Phospholipids are amphipathic molecules, i.e., they present a polar portion and a nonpolar portion. In contact w
Explain Polio Adults who have not previously been immunized against polio should receive a primary series of inactivated polio vaccine (IPV) if traveling to areas where polio i
Use of micro-organisms to control insect pests, pathogens or weeds constitutes biological control, and the biological agents employed are called biocontrol agents. Micro-organis
A decrease in blood plasma levels of parathyroid hormone A. occurs in response to an increase in the levels of calcium ions in blood plasma. B. leads to an increase in the a
Write two functions of proteins in biological systems. The important functions of proteins in biological systems are as follows: enzymes membrane carriers anti
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
Meroblastic or partial cleavage The egg does not divide totally because divisions are restricted to only a part of the egg where as the rest of the egg remains completely uncl
What is the evolutionary advantage of the occurrence of sperm cells and larval stage in the life cycle of sponges? The sexual reproduction in sponges, in addition to contributi
Why is the skin on worms, the gills in fish, and the lungs in humans good epithelial surfaces for respiration. Be specific.
Nature defences against viral infections 1. Interferons - In 1957 Issue and Lindenmann discovered that vertebrate cells infected with viruses, produce a diffusible antiv
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