Most microtubules in a cell consist of a simple tube, a singlet microtubule, built from 13 protofilaments. 

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#Id: 5415

#Unit 7. System Physiology – Animal

Fibrous astrocytes, contain many intermediate filaments are found primarily in white matter.Protoplasmic astrocytes are found in gray matter and have a granular cytoplasm.

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#Id: 7312

#Unit 12. Applied Biology

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#Id: 2329

#Unit 3. Fundamental Processes

Once DNA has been melted, the trajectory of the individual strands within the enzyme is no longer constrained by the rigidity of the double helix, allowing DNA to make its 90° turn at the active site.

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#Id: 4837

#Unit 13. Methods in Biology

The type I error significance level or rate level is the probability of refusing the null hypothesis given that it is true.

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#Id: 2098

#Unit 8. Inheritance Biology

Chromosome duplications are one way in which new genes evolve.