In microtubules, the end with exposed β-subunits is the ___?___, while the end with exposed α-subunits is the __?____.

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#Question id: 151

#Unit 1. Molecules and their Interaction Relevant to Biology

The isoelectric point of alanine is pH = 6.15. It is mixed with proline (pHCOOH = 2.0; pHNH2= 10.6), and the mixture is placed in an electric field at pH 6.15. Which statement is true?

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#Question id: 2116

#Unit 2. Cellular Organization

When a cell is in equilibrium with its environment, which of the following processes occurs for substances that can diffuse through the plasma membrane?

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#Question id: 27407

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following  reason is most accurately satisfying that archaebacteria can live in harsh environment

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#Question id: 26440

#Unit 3. Fundamental Processes

Choose the correct statement 

a. Long patch repair system is accomplished by Lig1, FEN1, Pol ζ ε, and APE1 

b. Long patch repair system is accomplished by Lig3, FEN1, Pol ξ β ,APE1 & lyase action

c. Short patch repair system is accomplished by Lig3, FEN1, Pol  ξ β,APE1 & lyase action

d. Short patch repair system is accomplished by Lig1, FEN1, Pol ζ ε, , and APE1

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#Question id: 1298

#Unit 4. Cell Communication and Cell Signaling

As fibroblasts form a three-dimensional structure in contact with the ECM, the cells bound to ECM: