Consider 1000 bp DNA.

500 bp is sequence a, present in a single copy.

500 bp is sequence b (100 bp) repeated 5 times:

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#Unit 11. Evolution and Behavior

Observational learning

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#Unit 2. Cellular Organization

phosphoserine/threonine-binding F-box protein is Skp2, which uses a series of leucine-rich repeats to bind to target proteins only when they are phosphorylated.

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#Unit 3. Fundamental Processes

Ultraviolet irradiation causes dimer formation between adjacent thymines. The dimer blocks replication and transcription. 

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#Unit 8. Inheritance Biology

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#Unit 6. System Physiology – Plant