Cells of Escherichia coli take up lactose via lac permease, glucose via the phosphotransferase system, and maltose via an ABC- type transporter. For each of these sugars describe: (1) the components of the transport system and (2) the source of energy that drives the transport event.
Answer to relevant QuestionsCalculate the surface-to-volume ratio of a spherical cell 15 mm in diameter and of a cell 2 mm in diameter. What are the consequences of these differences in surface-to-volume ratio for cell function? What are aminoacyl-tRNA synthetases and what types of reactions do they carry out? How does a synthetase recognize its correct substrates? Why are errors in DNA replication so rare? What enzymatic activity, in addition to polymerization, is associated with DNA polymerase III and how does it reduce errors? Concerning the pH of the environment and of the cell, in what ways are acidophiles and alkaliphiles different? In what ways are they similar? Describe how new peptidoglycan subunits are inserted into the growing cell wall. How does the antibiotic penicillin kill bacterial cells, and why does it kill only growing cells?
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