Degeneracy of the Genetic Code

TLS Online TPP Program

#Id: 2475

#Unit 13. Methods in Biology

IEF takes place in a pH gradient and can only be used for amphoteric substances such as peptides and proteins. The charged molecules move toward the anode or the cathode until they reach a position in the pH gradient where their net charges are zero. This pH value is the “isoelectric point” (pI) of the substance.

TLS Online TPP Program

#Id: 2987

#Unit 13. Methods in Biology

During differential sedimentation the largest class of particles forms a pellet on the
bottom of the centrifuge tube, leaving smaller-sized structures within the supernatant.

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#Id: 5303

#Unit 7. System Physiology – Animal

Atrial systole 

Increase in atrial pressure is reflected back to the veins, it appears on the venous pulse record as the a wave.

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#Id: 2529

#Unit 13. Methods in Biology

The duration of primer extension is usually 2 min at 72°C

TLS Online TPP Program

#Id: 6059

#Unit 10. Ecological Principles

Tundra:   Tundra is found at high latitudes, adjacent to ice margins, where insolation is low.  Tundra is the youngest of all biomes as it was formed after the retreat of glaciers 10000 years ago.  Lack of light and rainfall mean (25 cm per year) that rates of photosynthesis and productivity are low. Large part of the year, water can be locked away in permafrost, a layer of permanently frozen soil below 0.5–1 m.