The SRP is made up of six proteins bound to a 300-nucleotide RNA, which acts as a scaffold for the hexamer.

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#Id: 492

#Unit 2. Cellular Organization

The metaphase scaffold consists of a dense network of fibers. Threads of DNA emanate from the scaffold, apparently as loops of average length 30 to 90 kb.

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#Id: 6742

#Unit 8. Inheritance Biology

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#Id: 166

#Unit 5. Developmental Biology

Foregut endoderm and cardiac mesoderm cause the synthesis of the Otx2 transcription factor in the head ectoderm during the late gastrula stage

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#Id: 7989

#Unit 10. Ecological Principles

Marine turtles and seabirds ingest seawater when consuming prey or drink it, having no access to fresh water.

These animals have specialized structures called salt glands located around the eyes and nostrils.

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#Id: 7098

#Unit 3. Fundamental Processes

In about half the polypeptides, the methionine at the terminus is removed by an aminopeptidase, which creates a new terminus from R2 (originally the second amino acid incorporated into the chain). When both steps are necessary, they occur sequentially. The removal reaction(s) occur rather rapidly when the nascent polypeptide chain has reached a length of 15 amino acids.