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Enzymes work to speed up a chemical reaction by: a. attaching coenzymes to the substrate b. heating up the substrate c. lowering the activation energy of the reaction d. supplyi
How do plants solve the problem of transporting substances throughout their tissues? In bryophytes the substance transport is completed by diffusion. In tracheophytes (pteridop
Closed Type of Circulatory Systems Some non-chordates, like cephalopods (octopuses, squids), earthworms, polychactes and all vertebrates have a closed circulation along with b
Which is the vertebrate class that is considered the first entirely terrestrial? The first totally terrrestrial vertebrate class, totally independent from the aquatic habitat,
a) What is 'vaso-constriction'? b) What are the effects of vaso-constriction in the skin? a) Vaso-constriction is the reduce in diameter of small arterioles an
Mechanism of Phloem Transport The efficiency and magnitude of translocation of food material are evident from the annual yields of various crops and fruits. Now, the question
Hormone s . The thyroid gland secretes following hormones. Thyroxine (tetraiodothyronine or T 4 )' and tri-iodothyronine or T 3 are secreted by the thyroid follicular cells.
Sickling occurs in deoxyhemoglobin, but not in oxyhemoglobin. Normal deoxyhemoglobin (HbA and HbS) molecules have a small hydrophobic "pocket" on the surface of a ? chain. In oxyhe
Phenomenon of embryogenesis is not confined to the reproductive system
Q. What is schistosomiasis? The Schistosomiasis is a worm infection caused by schistosomes, a species of flatworms (platyhelminthes). The disease is common in Latin America and
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