PTS1 signals are recognized by the peroxin Pex5 receptor

PTS2 signals are recognized by the peroxin Pex7 receptor

Neither targeting sequence is cleaved after import.

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#Id: 126

#Unit 5. Developmental Biology

The prospective lens cells secrete paracrine factors that instruct the optic vesicle to form the retina. 

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#Id: 9381

#Unit 11. Evolution and Behavior

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#Id: 7893

#Unit 2. Cellular Organization

A human cell has about 1000–2000 mtDNA molecules

A human egg has about 500,000 mtDNA molecules

A sperm has only about 100 mtDNA molecules

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#Id: 633

#Unit 3. Fundamental Processes

Transition and Transversion showed up during replication only.

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#Id: 7818

#Unit 10. Ecological Principles

In many endotherms, shivering occurs in cold conditions whereby the body undergoes rapid muscle contractions without any locomotion.

When the body temperature falls, brown fat cells increase their metabolic rate, and hence heat production.