Imagine that you are managing a large ranch. You know from historical accounts that wild sheep used to live there, but they have been extirpated. You decide to reintroduce them. After doing some research to determine what might be an appropriately sized founding population, you do so. You then watch the population increase for several generations, and graph the number of individuals (vertical axis) against the number of generations (horizontal axis). The graph will appear as
A) a diagonal line, getting higher with each generation.
B) an ?S,? increasing with each generation.
C) an upside-down ?U.?
D) a ?J,? increasing with each generation.
E) an ?S? that ends with a vertical line.
Answer: D) a ?J,? increasing with each generation.
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True or false. Look at the figure above to answer the questions below. _______ Resting potential is generated only by the movement ions. _______ The voltage differences shown above are measured across the plasma membrane (not deep within the cell). ______
The changes in voltage seen at #2 and #4 in the figure caused by movement of the same types of ions across the membranes. _______ _______ _______ The trace above is following the voltage change as down the axon. The voltage change above is an all-or-nothing response. Different membrane proteins are responsible for generating the voltage change seen at #2 and #4 in the figure. _______ _______ All voltage changes in a neuron's plasma membrane characteristic shape shown above. The changes in voltage shown above are due to the of ions right through the plasma membrane phospholipids bilayer (without the presence accessory protein). What will be an ideal response?
A researcher is working to generate a new cancer drug. Thus far, he has identified a compound that can reduce the size of tumors in the lung. However, in order for the drug to work, the lung tumor has to be small. In addition, the tumor cannot have metastasized (spread to other areas of the body). Furthermore, he knows that the drug acts to prohibit the signaling from one tumor cell to another
tumor cell. Given the above information, this new drug prohibits: A. synaptic signaling between tumor cells. B. autocrine signaling between tumor cells. C. paracrine signaling between tumor cells. D. endocrine signaling between tumor cells.
How many hydrogen molecules are released in glycolysis?
What will be an ideal response?
Which of the following statements about plant reproduction is incorrect?
A. Dioecious plants have male and female flowers on different plants. B. Monoecious plants can have male and female flowers on the same plant. C. Self-pollinated plants must be visited by pollinators for fertilization to occur. D. Outcrossing promotes genetic diversity. E. Self-pollinating angiosperms are usually adapted to stable habitats.