In a highly turbid environment (eg. A rapidly flowing stream), which of these ce
ID: 45320 • Letter: I
Question
In a highly turbid environment (eg. A rapidly flowing stream), which of these cell shapes do you think would be most beneficial (rank from 1 = best to 4 = worst)? Explain the reasoning behind your ranking. In an environment with many larger single-called predators, which of these cell shapes do you think would be most beneficial (rank from 1 = best to 4 = worst)? Explain the reasoning behind your ranking. Constructing a hypothesis about optimal environment from cell shape. In your small groups, you will receive a microscopy photo of an organism with an Active transport of lactose into E. coli: Active transport is the movement of ions or molecules against a concentration gradient. This movement requires energy and the assistance of a membrane protein. In some cases, ATP is directly hydrolyzed to form ADP and pi. Facilitated transport is not a very common type of transport in bacteria. Can you think of at least one reason why this is the case (hint: why is active transport generally more useful?)? In the space below, draw a model of diffusion, facilitated diffusion and active transport (draw the definition). Include an example of an appropriate compound for each figure. Active Transport Facilitated Diffusion DiffusionExplanation / Answer
4. the cell with flagella is ranked as 1, The bent shped is ranked as 2, The spherical shaped cell is ranked as 3. The cell attached to surface is ranked as 4. This is because the cell ranked 1 exhibits propelling movement against the flow of water and can move forward. The cell ranked 2 because of angular shape can move against water flow. The spherical cell being small in size can move forward. The cell attached to surface cannot move because it is sedentary by being attached to a surface.
6. Single cells large predators can easily capture the cells being small in size than them and hence, the large sphrical cell is ranked as 1, the angular or bent shaped cell is ranked as 2, the cell with flagellum can move and escape the predator is ranked as 3 and the small spherical cell becomes target or prey to the predator is ranked as 4.
3. The larger molecules like lactose need energy for their transport across the membrane. The ATP hydrolysis provides the energy and phosphate groups containing negative charge that can easily enable the lactosemolecules pass through the membrane. Hence, active transport or facilitated diffusion enables the lactose molecules to transport across the membrane against the concentration gradient.
4. Active transport requires energy for the transport of substance across the membrane and the energy isprovided by ATP. Example: transport of lactose molecule.
Facilitated diffusion is exchange of ions across the membrane against the concentration gradient. Example: Two Na+ ions are exchanged for three Cl- ions.
Diffusion is the simple passing of substances across the membrane. Example : Glucose.
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