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TLS Online TPP Program

#Id: 6155

Human member of the Y family of translesion polymerases (DNA Pol n) correctly inserts two A residues opposite a thymine dimer. 

#Unit 3. Fundamental Processes #Mutation and Repair #Part B Pointers
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TLS Online TPP Program

#Id: 1512

#Unit 2. Cellular Organization

In a microtubule,
The end with exposed β-subunits is the (+) end
The end with exposed α-subunits is the (−) end

 
TLS Online TPP Program

#Id: 1513

#Unit 2. Cellular Organization

Microtubules exist in three forms:
Singlet
Doublet
Triplet
TLS Online TPP Program

#Id: 1514

#Unit 2. Cellular Organization

Most microtubules in a cell consist of a simple tube, a singlet microtubule, built from 13 protofilaments. 
TLS Online TPP Program

#Id: 1515

#Unit 2. Cellular Organization

Doublet contains one complete 13-protofilament microtubule (A tubule) and one additional tubules (B tubule) consisting of 10 protofilaments.
 
TLS Online TPP Program

#Id: 1516

#Unit 2. Cellular Organization

Triplet contains one complete 13-protofilament microtubule (A tubule) and two additional tubules (B & C tubule) consisting of 10 protofilaments each.
TLS Online TPP Program

#Id: 1517

#Unit 2. Cellular Organization

All microtubules are nucleated from structures known as microtubule-organizing centers, or MTOCs.