List the steps associated with the cohesion-tension model of xylem transport.
What will be an ideal response?
1. Transpiration in the leaves causes water to evaporate.
2. As the water leaves the leaves it creates tension.
3. Tension pulls the water column upward from the root to the leaves.
4. Cohesion between water molecules causes one water to pull another water upwards.
5. Water enters the xylem at the root system from the surrounding environment.
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Ecological pyramids can be upright or inverted, depending on the ecosystem. If the numbers pyramid is inverted, what information does this portray?
a. extinction event b. ecosystem recovering from catastrophe c. lower populations in producers than consumers d. excessive nutrients in the system
Describe the evolutionary relationship of lancelets to tunicates and to hagfishes. Are lancelets more closely related to tunicates or to hagfishes, or are they equally related?
What will be an ideal response?
Which statement best describes the activity of the sodium-potassium pump?
a. It transports hydrogen ions out of the cell. b. It transports water directly out of the cell. c. It transports 2 sodium ions into the cell in exchange for 3 potassium ions. d. It transports 3 sodium ions out of the cell in exchange for 2 potassium ions. e. It transports 2 sodium ions out of the cell in exchange for 2 potassium ions.
During metaphase, ________
A) the nuclear envelope breaks up B) sister chromatids separate C) centromeres divide D) chromosomes line up in the middle of the cell