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Q. Which other phylum of the animal kingdom present species with exoskeleton?
Arthropods present exoskeleton made of chitin. Echinoderms do not have exoskeleton but they present a calcareous endoskeleton. Some chordates also have an external carapace.
Oxides of nitrogen: These include nitrogen monoxide (NO) and nitrogen dioxide (NO2). NO is a colourless, odourless and inert gas but like CO it can also combine with
Q. What are the major parts of ferns? Ferns are constituted by small roots that come downwards from the rhizome stem and often horizontalized. The fronds also arise from the rh
Describe a. the factors responsible for promoting lactation, and b. the mechanism responsible for the cessation of lactation when a mother weans her baby.
Which of the following are true for ventilation? A. The problems with ventilation induced by injection of curare occur because of the drug's direct action on nicotinic ACh Rec
explain protozoa taxonomy
What is genotype? What is the difference between phenotype and genotype? The Genotype is the genes, DNA nucleotide sequences contained in the chromosomes of an individual, whic
How much ampicillin (sodium sal, mw=371.40) would you dissolve in 400 mL of water to make 80 mg/ml solution of ampicillin?
Endothelium is a source of vasoconstrictor factor also. The best characterized of these are the endothelins. Endothelium produces only ET1. Unlike NO, which is released rapidly in
Beta decay is the type of radioactive decay in which the radioisotope emits a little negatively-charged and fast-moving particle from its nucleus. A beta particle is almost simila
Q. What are some important neurotransmitters? The following are some neurotransmitters: serotonin, noradrenaline (norepinephrine), histamine,acetylcholine, adrenaline (epinephr
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