A mutated strain of E. coli replicates DNA normally at 25°C, but replication stops immediately when the temperature is raised to 37°C. Which protein is likely to be non-functional at the higher temperature?

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#Question id: 10972

#7. System Physiology – Animal

What is the proper pathway for the extrinsic clotting pathway?

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#Question id: 562

#1. Molecules and their Interaction Relevant to Biology

Phenyl-methane-sulfonyl-fluoride (PMSF) inactivates serine proteases by binding covalently to the catalytic serine residue at the active site; this enzyme-inhibitor bond is not cleaved by the enzyme.  This is an example of what kind of inhibition?

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#Question id: 5230

#11. Evolution and Behavior

Homeotic genes

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#Question id: 437

#1. Molecules and their Interaction Relevant to Biology

Which thermodynamic quantity is used to determine if a reaction in a cell is spontaneous?

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#Question id: 4589

#11. Evolution and Behavior

Darwin used the phrase "descent with modification" to explain ________.