A microtubule is a hollow cylindrical structure built from 13 parallel protofilaments, each composed of αβ-tubulin heterodimers stacked head to tail and folded into a tube.

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#Id: 4013

#Unit 7. System Physiology – Animal

SA node has Prepotential or pacemaker potential which is the gradual potential rise from the resting membrane potential to threshold  ( -40 mV) & this occur spontaneously

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#Id: 8686

#Unit 1. Molecules and their Interaction Relevant to Biology

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#Id: 5868

#Unit 10. Ecological Principles

The richness of some areas is increased by the presence of corridors

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#Id: 6695

#Unit 3. Fundamental Processes

Deamination of the human apolipoprotein B mRNA takes place by an enzyme called APOBEC1

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#Id: 1482

#Unit 4. Cell Communication and Cell Signaling

Neurofibromatosis, a benign tumor of the sheath cells that surround nerves, is caused by loss of both alleles of NF1, which encodes a RAS GAP-type protein.