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Q. Which type of cell came first in evolution - the eukaryotic cell or the prokaryotic cell?
This is an interesting problem of biological evolution. The majorly accepted hypothesis asserts that the prokaryotic cell, the simpler cell, appeared earlier in evolution than the more complex eukaryotic cell. The endosymbiotic hypothesis, for instance, affirms that aerobic eukaryotic cells appeared from the mutualist ecological interaction between aerobic prokaryotes and primitive anaerobic eukaryotes.
Sensory Receptors Sensory information received by these receptors is transmitted through sensory fibres of peripheral nerves to sensory areas at different levels of spinal cord
PARATHYRIOD GLANDS - They develop from the endoderm of the embryo. The parathyroid glands consist of four separate glands located on the posterior surface of the lobes of
Define Rhizoids - Types of Hyphae? Rhizoids - These are brown slender root like structures which arise in cluster from each node of the stolon. These penetrate the substratum
steps involved in glycolysis
Defective extra-preputial protrusion of the penis This defect is a result of hypoplasia or a defective penile erection due to a congenital mucosal fold – the frenulum - betwee
Protein structure is determined solely by a protein amino acid sequence. Should a genetically engineered protein in which the order of all amino acids is reversed therefore have th
What do we mean by the term isomer? Existence of different compounds having same molecular form but dtfferent structural forms are isomers. Monosaccharides exhibit a varie
living organisms and their excretory products
Define Procedure for use Microbiological Laboratory Equipments? Now carry out this activity following the steps given herewith: 1. Observe each instrument (as mentioned abov
what is tissue
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