Dictyostelium has evolved developmentally regulated systems of cell-cell adhesion that are necessary for the morphogenesis of individual cells into a coherent organism

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#Id: 2113

#Unit 8. Inheritance Biology

Haploinsufficiency- One copy of the gene is missing, a mutant phenotype is produced.

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#Id: 5180

#Unit 7. System Physiology – Animal

Serum has a higher serotonin content because of the breakdown of platelets during clotting.

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#Id: 2447

#Unit 3. Fundamental Processes

The enzymes DNA gyrase, which introduces negative supercoils into DNA, and DNA topoisomerase I, which removes negative supercoils in DNA, are required to prevent topological stresses from building up in the course of transcription and replication. 

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#Id: 5299

#Unit 7. System Physiology – Animal

Period of relaxation called diastole, during which the heart fills with blood A period of contraction called systole

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#Id: 2392

#Unit 3. Fundamental Processes

Trans-splicing is rare in multicellular eukaryotes, it occurs as the primary mechanism to process precursor RNA into mature, translatable mRNAs in some organisms, such as trypanosomes and nematodes.