A clathrin molecule,

called a triskelion, is composed of : 

Three heavy chains

Three light chains

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#Section 3: Genetics, Cellular and Molecular Biology

Vertebrate skeletal muscle contraction, also depends on set of specialized accessory proteins that are closely associated with the actin thin filaments:

a) Tropomyosin

b) Troponin

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#Section 3: Genetics, Cellular and Molecular Biology

3 isoforms of actin-

α - expressed only in muscle cells

β and γ - found together in almost all non-muscle cells

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#Id: 8398

#Section 3: Genetics, Cellular and Molecular Biology

In the presence of ATP and Ca+2 , the myosin heads extending from the thick

filaments walk toward the (+) ends of the thin filaments.

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#Id: 10341

#Section 2: General Biology

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#Section 3: Genetics, Cellular and Molecular Biology

Type of natural selection

1. Stabilized natural selection

2. Directional Natural selection

3. Disruptive Natural selection

4. Balance natural selection