There are two principal modes of neurulation: 

1. Primary neurulation

2. Secondary neurulation

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#Id: 2140

#Unit 9. Diversity of Life Forms

Darwin have agreed that all animals with vertebrae form a single phylogenetic branch of species that share a common ancestor.

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#Id: 6045

#Unit 10. Ecological Principles

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#Id: 8467

#Unit 1. Molecules and their Interaction Relevant to Biology

polylysine is a random coil at pH values below about 11, where repulsion of positive charges prevents helix formation. At pH 12, where polylysine is a neutral peptide chain, it readily forms an a-helix.

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#Id: 92

#Unit 5. Developmental Biology

In Autonomous Specification

Prospective potency is equal to prospective fate.

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#Id: 8226

#Unit 2. Cellular Organization

I-cell disease

• almost all of the hydrolytic enzymes are missing from the lysosomes of many cell types.

• mis-sorting has been traced to a defective or missing GlcNAc phosphotransferase.