Three mechanisms for LOH of tumor-suppressor genes:

Inactivating mutation or deletion

Chromosome missegregation

Mitotic recombination

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#Id: 1179

#Unit 7. System Physiology – Animal

Blind spot 

There are no visual receptors over the optic disk.

 

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#Unit 3. Fundamental Processes

Class I enzymes attach the amino acid to the 2’-OH of the tRNA and are generally monomeric. Class II enzymes attach the amino acid to the 3’-OH of the tRNA and are typically dimeric or tetrameric.The amino acids for which the Class I synthetases are specific tend to be larger and more hydrophobic than those for Class II synthetases.

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#Unit 4. Cell Communication and Cell Signaling

Lectin pathway

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#Unit 3. Fundamental Processes

A pre-tRNA intron is excised in one step 

Finally, hydrolysis of GTP and ATP is required to join the two tRNA halves generated by cleavage on either side of the intron.

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#Id: 4317

#Unit 11. Evolution and Behavior

The Theory of Spontaneous Generation

The Greek philosopher Aristotle (384–322 BC) was one of the earliest recorded scholars to articulate the theory of spontaneous generation, the notion that life can arise from nonliving matter.