The four sentences (labelled 1, 2, 3, 4) below, when properly sequenced would yield a coherent paragraph. Decide on the proper sequencing of the order of the sentences and key in the sequence of the four numbers as your answer:1. In the central nervous systems of other animal species, such a comprehensive regeneration of neurons has not yet been proven beyond doubt.2. Biologists from the University of Bayreuth have discovered a uniquely rapid form of regeneration in injured neurons and their function in the central nervous system of zebrafish.3. They studied the Mauthner cells, which are solely responsible for the escape behaviour of the fish, and previously regarded as incapable of regeneration.4. However, their ability to regenerate crucially depends on the location of the injury.

ExplanationQuestion 14:The four sentences (labelled 1, 2, 3, 4) below, when properly sequenced would yield a coherent paragraph. Decide on the proper sequencing of the order of the sentences and key in the sequence of the four numbers as your answer:Complex computational elements of the CNS are organized according to a “nested” hierarchic criterion; the organization is not permanent and can change dynamically from moment to moment as they carry out a computational task.Echolocation in bats exemplifies adaptation produced by natural selection; a function not produced by natural selection for its current use is exaptation --feathers might have originally arisen in the context of selection for insulation.From a structural standpoint, consistent with exaptation, the living organism is organized as a complex of “Russian Matryoshka Dolls” -- smaller structures are contained within larger ones in multiple layers.The exaptation concept, and the Russian-doll organization concept of living beings deduced from studies on evolution of the various apparatuses in mammals, can be applied for the most complex human organ: the central nervous system (CNS).Show Answer

Question 121 ptsIn the mature brain, new neurons:Group of answer choicesare never producedare produced only when there is disease or injuryare normally produced in small numbers in all brain regionsare primarily produced to replace neurons lost during ageingare normally produced in only a few locations PreviousNext

2. These neurons bring impulses to the CNS

Roger Sperry's chemoaffinity hypothesisGroup of answer choicesarises from the fact that frog axons are able to regenerate.is supported by the orderly reinnervation of the frog optic tectum by regenerating retinal ganglion cells.correctly predicted that each optic tectal neuron–retinal axon pair would have a unique molecular lock-and-key recognition signal.was based upon his discovery of cell adhesion molecules in the optic tectum.relies on the random innervation of the optic tectum by retinal neurons

Power of regeneration is lowest in :-A Brain cell B Liver cell C Bone cell D Muscle cell