In a covalent bond, electrons are shared between atoms. In an ionic bond, electrons are transferred between atoms.

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#Section 2: General Biology

In a covalent bond, electrons are shared between atoms. In an ionic bond, electrons are transferred between atoms.

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#Section 3: Genetics, Cellular and Molecular Biology

Labile factors called cyclins drive the progression of cells through different stages of the cell cycle by binding to CDKs.

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#Section 3: Genetics, Cellular and Molecular Biology

Cells commit to a new cell division at a specific point in G1 known as START or the restriction point.

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#Section 3: Genetics, Cellular and Molecular Biology

R-factor 

In mammalian cells - cyclin D 

In yeast - Cln3

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#Section 3: Genetics, Cellular and Molecular Biology

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#Section 3: Genetics, Cellular and Molecular Biology

cyclin-CDK complexes preferentially phosphorylate

serine and threonine residues when they are found within the consensus sequence:

[S/T]PX[R/K]K 

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#Section 3: Genetics, Cellular and Molecular Biology

G1 Cyclin–CDKs

In human - cyclin D-CDK 4 

cyclin D-CDK 6

In budding yeast - CIn 3-Cdc 28