A single D loop is found as an opening of 500 to 600 bases in mammalian mitochondria.

TLS Online TPP Program

#Id: 8572

#Unit 2. Cellular Organization

Soft keratins, or cytokeratins, are found in epithelial cells and make up the skin.

TLS Online TPP Program

#Id: 8573

#Unit 2. Cellular Organization

In all epithelia, keratin filaments associate with: Desmosomes (cell–cell contact)

Hemidesmosomes (cell–matrix contact)

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#Id: 8574

#Unit 2. Cellular Organization

when defective keratins are expressed in the basal cell layer of the epidermis, they produce a disorder called epidermolysis bullosa simplex

TLS Online TPP Program

#Id: 8575

#Unit 2. Cellular Organization

Vimentin, found in mesenchymal cells;

GFAP (glial fibrillary acidic protein), found in glial cells

Desmin, found in muscle cells

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#Id: 8576

#Unit 2. Cellular Organization

In smooth muscle, desmin filaments link cytoplasmic dense bodies to the plasma membrane to ensure that cells resist overstretching.

TLS Online TPP Program

#Id: 8577

#Unit 2. Cellular Organization

In skeletal muscle, 

The desmin filaments encircle the Z disk and are cross-linked to the plasma membrane.