Kinetochores assemble on regions of chromosomal DNA marked by a centromere-specific H3 histone variant called CENP-A.

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#Id: 2616

#Unit 13. Methods in Biology

Type I restriction endonucleases are complex endonucleases and have recognition sequences of about 15 bp; 

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#Id: 7207

#Unit 5. Developmental Biology

IL-4 increases expression of class II molecules in resting B cells, turning them into more efficient APCs.

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#Id: 10153

#Unit 6. System Physiology – Plant

Strigolactone promote symbiotic interactions with arbuscular mycorrhizal fungi, facilitating phosphate uptake from the soil.

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#Id: 2936

#Unit 3. Fundamental Processes

Deletion of dat causes initiation to occur more frequently. This significantly increases the amount of DnaA available to the origin.

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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