Arrestin binds tightly to rhodopsin only when rhodopsin kinase has phosphorylated a sufficient number of C-terminal serines and threonines.

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#Id: 6989

#Unit 5. Developmental Biology

Totipotency

the ability of a single cell to divide and produce all of the differentiated cells in an organism (embryonic and extra embryonic cells).

Eg- spores and zygotes 

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#Id: 8664

#Unit 10. Ecological Principles

The Enemy release hypothesis is the idea that invasive species are less impacted by enemies than native species.

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#Id: 6372

#Unit 2. Cellular Organization

lacZ encodes for b-galactosidase,a tetramer of 500 kD. The enzyme breaks lactose is cleaved into glucose and galactose.  This enzyme also produces an important byproduct, b-1,6-allolactase.

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#Id: 892

#Unit 13. Methods in Biology

CCG and CGG are the rarest trinucleotides in most A+T-rich bacterial genomes and CTAG is the rarest tetranucleotide in G+C-rich bacterial genomes.

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#Id: 810

#Unit 3. Fundamental Processes

The 12-bp promoter sequence need not be contiguous. 

If a specific number of base pairs separates two constant shorter sequences, their combined length could be less than 12 bp, because the distance of separation itself provides a part of the signal (usually 16-17 bp)