Natural Experiments
What will be an ideal response?
the dependent variable (typically a measure of organism health) is measured under differing contexts that are not manipulated
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Plant hormones generally ____ concentrations to be effective, and usually have ____ on different plant
tissues.
a. are effective only in extremely large; the same effect b. require only low; different effects c. require only low; the same effect d. are effective only in extremely large; different effects e. require moderate; the same effect
Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma. This damage will most directly affect the _____
A) splitting of water B) flow of electrons from photosystem II to photosystem I C) synthesis of ATP D) reduction of NADP+
Imagine you are performing a cross involving seed color in garden pea plants. What F1 offspring would you expect if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over green.
A. 100 percent yellow-green seeds B. 100 percent yellow seeds C. 50 percent yellow, 50 percent green seeds D. 25 percent green, 75 percent yellow seeds
Predict the change in surface area and volume of a spherical cell if the diameter of the cell doubles.
A. The surface area will increase by a factor of 2 and the volume will increase by a factor of 4. B. The surface area and volume will both increase by a factor of 4. C. The surface area will increase by a factor of 4, while the volume will increase by a factor of 8. D. The surface area will increase by a factor of 8 while the volume will increase by a factor of 4.