TyrRS distinguishes between tyrosine and phenylalanine through hydrogen bonding with tyrosine’s OH group. Since no other amino acid resembles tyrosine, the enzyme can do without an editing function.

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#Unit 10. Ecological Principles

Natural selection will favor those individuals that allocate their resources in a way that achieves maximum fitness.

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#Unit 3. Fundamental Processes

RNA polymerase III transcribes a set of short genes. The classical class III genes (types I and II) have promoters that lie wholly within the genes.

 

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#Unit 2. Cellular Organization

APC/C core is organized into three modules: 

1. a scaffold module 

2. a catalytic module

3. a substrate recognition module

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#Unit 3. Fundamental Processes

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#Unit 13. Methods in Biology

Ion-exchange chromatography is frequently chosen for the separation and purification of proteins, peptides, nucleic acids, polynucleotides and other charged molecules, mainly because of its high resolving power and high capacity.