BIOL 1000 Lecture Notes - Lecture 3: Slime Mold, Atp Hydrolysis, Active Transport

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apricotoyster734

16 May 2016

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Active transport requires energy and is against the concentration gradient. Secondary active transport uses an ionic concentration gradient to move another molecule against its concentration gradient. Symport: both ion and molecule move in same direction (co-transport. Antiport: ion moves in one direction and molecule in the opposite direction (exchange diffusion) Membrane potential (or potential difference) refers to the difference between the inside charge and outside charge. In summary, membrane crossing mechanisms are diffusion, facilitated diffusion and. Cells need to communicate in order for action to take place (cell communication = Intracellular communication: communication between internal parts of the cells. Cells communicate with one another through: direct channels of communication (gap junctions/plamodesmata, specific contact between cells (touch and communicate via extracellular protrusions) Cells aggregate to survive when food is scarce. Dictyostelium discoideum (slime mold) aggregation in amoeba release a chemical intro the extracellular environment. It is detected, and therefore movement towards each other is initiated.

Related Questions

Read the following scenarios and indicate which of the following processes they describe.

11. Sodium molecules move randomly around a solution of sodium chloride in water, frequently colliding with other sodium ions and chloride ions. secondary active transport diffusion osmosis facilitated diffusion primary active transport

12. Sodium ions (Na+) move through sodium channels in a synthetic membrane. primary active transport secondary active transport facilitated diffusion osmosis

13. Water molecules move into the cytosol of a cell placed in a hypotonic solution. primary active transport secondary active transport facilitated diffusion osmosis

14. Water molecules move into the cytosol of a cell placed in pure water. facilitated diffusion osmosis secondary active transport primary active transport

15. Water molecules move out of a cell placed in a hypertonic solution. facilitated diffusion primary active transport secondary active transport osmosis

16. The action of sodium-potassium pumps moves sodium ions (Na+) out of a cell and potassium ions (K+) into a cell. facilitated diffusion secondary active transport osmosis primary active transport

17. Glucose molecules move into cells lining the intestine against their concentration gradient driven by the movement of sodium ions (Na+) into the cells down their concentration gradient. osmosis secondary active transport primary active transport facilitated diffusion

18. A beaker of water is separated by a selectively permeable membrane that allows the passage of water but not ions. A solution of 4% sodium chloride (NaCl) is placed on one side of the membrane and pure water is placed on the other side of the membrane. The solutions are allowed to equilibrate. At this point, which process is going on? facilitated diffusion osmosis secondary active transport primary active transport

amaranthelk944

TRUE OR FALSE? Correct the statement if it is false.

1.) A shallow concentration gradient limits the rate of facilitated diffusion

2.) Symport and antiport are coupled transport systems in which energy released by moving an ion from a region of high concentration to low concentration is used to move a solute against its concentration gradient

3.) Transport of siderophore-ion complexes into the cell requires the hydrolysis of PEP

4.) Both ABC transport and PTS transport are modular systems which ceoncentrate the substrate in the cell

Match each term

1.facilitated diffusion 2. Hypertonic solution
3. Hypotonic solution
4. Active Transport
5. Secondary acive transport
6. Simple Diffusion

A.	The transport of a nonpolar molar across a biological membrane from the compartment with a high concentration to one with low concentration.
B.	A process that utilizes energy to move compounds against a concentration gradient, i.e., from the compartment with lower concentration to one with a higher concentration.
C.	a solution that would cause blood cells to swell and burst
D.	a solution that would cause red blood cells to shrink
E.	The transport of a hydrophilic molecule across a biological membrane using an ion gradient created by an electrogenic pump.
F.	A process by which compounds are transported from a region of high concentration to one of lower concentration using membrane proteins as transporters.

BIOL 1000 Lecture Notes - Lecture 3: Slime Mold, Atp Hydrolysis, Active Transport

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