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Which type of cell came first in evolution - the eukaryotic cell or the prokaryotic cell?
This is an interesting problem of biological evolution. The most accepted hypothesis asserts that the simpler cell, the prokaryotic cell, appeared earlier in evolution than the more difficult eukaryotic cell. The endosymbiotic hypothesis, for instance, affirms that aerobic eukaryotic cells appeared from the mutualist ecological interaction among aerobic prokaryotes and primitive anaerobic eukaryotes.
Q. How is excretion done in amphibians? Adult amphibians have kidneys that filter blood. Nitrogen waste is excreted as urea so amphibians are ureotelic beings. The aquatic, lar
CIRCUL A T O R Y SYSTEM IN COCKROACH Type is open or lacunar. i.e. b.v. absent. Organs are dipped in haemolymph. 1 . HAEMOLYMPH - Blood and lymph are mixed.
Osmoregulation in Freshwater Metazoans Freshwater and brackish water animals that are live in hypoosmotic(of lower osmotic pressure) environment and keep a hyperosmotic (of h
Microtubule assembly: A) generally originates in the centrosome. B) occurs only during mitosis. C) occurs randomly throughout the cell. D) is regulated by myosin. E) is inhibited d
Why would the O-H bond in C=O-H and the OH bonding with a water molecule be considered weak?
Regulation of pyruvate kinase, pyruvate carboxylase and PEP carboxykinase A) In liver, pyruvate kinase is inhibited by high levels of ATP and alanine so which glycolysis
Exterrral and Internal Environment Let us try to understand the concept of environment with some examples. Can you identify the environment of a single carp fish in the pond? It
W A TER Occurence Water is the most abundant substance, covering 70% of earth's surface. It constitutes 60-90% of living cells. 5-6% in tooth e
Advantages of Autonomous Transactions An autonomous transaction, once started is fully independent. It shares no locks, resources, or commit-dependency with the main transacti
A balanced diet must have enough energy to meet the body's needs. What else must it have? In addition to sufficient energy, a balanced diet must have proteins, car
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