The operation of the sodium-potassium "pump" moves _____
A) sodium and potassium ions into the cell
B) sodium and potassium ions out of the cell
C) sodium ions into the cell and potassium ions out of the cell
D) sodium ions out of the cell and potassium ions into the cell
D
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The most developed sense in humans is
(a) hearing. (b) vision. (c) taste. (d) smell.
A scientist found an unweathered igneous rock that contained 0.025 g of potassium-40 and 0.075 g of argon-40. The half-life of potassium-40 is 1.3 billion years. Using the table from figure 22.8 the age of the rock would be estimated to be
A. 2.6 billion years old.
B. 0.050 billion years old.
C. 1.3 billion years old.
D. 0.001875 billion years old.
E. 1.69 billion years old.
How do Rhizobia bacteria colonize root cells to conduct N fixation?
What will be an ideal response?
Suppose that in a population you are studying you find the sex ratio is different from what you predicted in your model
Using simple proportions of male and female offspring, show how over a few generations, natural selection should move the sex ratio to the value you predicted in your model. What will be an ideal response?