A second class of CKIs found in metazoan cells is the Cip/Kip family of CKIs, consists of three proteins—p21CIP, p27KIP1, and p57KIP2. 

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#Section 3: Genetics, Cellular and Molecular Biology

Lysosomes are membrane-enclosed organelles filled with soluble hydrolytic enzymes that digest macromolecules.

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#Id: 9210

#Section 3: Genetics, Cellular and Molecular Biology

Genetic bottleneck

Genetic drift arises is through a genetic bottleneck, which develops when a population undergoes a drastic reduction in size

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#Id: 2236

#Section 3: Genetics, Cellular and Molecular Biology

Highest rates of substitutions in regions of the gene that have the least effect on function, such as the third position of a codon, flanking regions, and introns.

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#Id: 8598

#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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#Id: 8057

#Section 2: General Biology

Cysteine, tryptophan, and methionine are not common amino acids: together, they constitute approximately 5 percent of the amino acids in a typical protein. Four amino acids—leucine, serine, lysine, and glutamic acid—are the most abundant amino acids, constituting 32 percent of all the residues in a typical protein.