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TLS Online TPP Program

#Id: 8469


The RHH (L amino acids) α helix, which ideally has ϕ = −57° and ψ = −47°

#Unit 1. Molecules and their Interaction Relevant to Biology #Conformation of proteins #Part B Pointers
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TLS Online TPP Program

#Id: 8395

#Unit 2. Cellular Organization

Sarcomere
Within each skeletal muscle cell are many myofibrils consisting of a repeating array of a specialized structure

TLS Online TPP Program

#Id: 8396

#Unit 2. Cellular Organization

Each sarcomere contains two major types of filaments: 
Thick filaments (myosin II)
Thin filaments (actin and associated proteins)

TLS Online TPP Program

#Id: 8397

#Unit 2. Cellular Organization

Z disk 
Thin actin filaments are assembled with their (+) ends embedded in a densely staining structure

TLS Online TPP Program

#Id: 8398

#Unit 2. Cellular Organization

In the presence of ATP and Ca+2 , the myosin heads extending from the thick
filaments walk toward the (+) ends of the thin filaments.

TLS Online TPP Program

#Id: 8399

#Unit 2. Cellular Organization

The structure of the sarcomere is maintained by a number of accessory proteins: 
1. CapZ 
2.Tropomodulin
3.Titin 
4.Nebulin

TLS Online TPP Program

#Id: 8400

#Unit 2. Cellular Organization

In skeletal muscle cells, 
a low cytosolic Ca+2 level is maintained by a unique Ca+2 ATPase that continually pumps Ca+2 ions from
the cytosol containing the myofibrils into the SR, establishes a reservoir of Ca+2 in the SR.

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