A replicated region appears as a bubble within nonreplicated DNA.

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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.

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#Id: 7035

#Unit 11. Evolution and Behavior

Neo-Lamarckism - August Weismann cut off the tails of mice for many generations and showed that this mutilation had no effect on the tail length of their descendants

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#Id: 3973

#Unit 7. System Physiology – Animal

The action potential spreads throughout the myocardium in the following sequence: SA node  Atrial internodal tracts and atria  AV node  Bundle of His  Purkinje system  Ventricles

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#Id: 8376

#Unit 2. Cellular Organization

Myosin 

Actin-based motors powered by ATP hydrolysis.

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#Id: 4673

#Unit 13. Methods in Biology

A related quantitative technique, rocket electrophoresis, does permit measurement of antigen levels. In rocket electrophoresis, a negatively charged antigen is electrophoresed in a gel containing antibody. The precipitate formed between antigen and antibody has the shape of a rocket, the height of which is proportional to the concentration of antigen in the well.