There are 4 genes (I, Z, Y, A), 2 Promoters and 3 lac operators in Lac operon

The major O1 lac operator lies adjacent to promoter

The O1 operator extends from position -5 just upstream of the mRNA start point to position +21 within the transcription unit.

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#Id: 9590

#Unit 11. Evolution and Behavior

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#Id: 2881

#Unit 13. Methods in Biology

In electrophoresis because of the varying charges and masses, of different molecules

and particles of a mixture will migrate at different velocities under uniform force and

will thus be separated into single fractions.

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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. 

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#Id: 5322

#Unit 7. System Physiology – Animal

Isovolumetric Ventricular Relaxation

Left ventricle is relaxed

Left ventricular pressure decreases

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#Id: 5371

#Unit 10. Ecological Principles

Pitfall traps set into the ground catch wandering species such as beetles and spiders. These have rain covers to prevent the animals from drowning