A student is collecting the gas given off from a plant in bright sunlight at a temperature of 27C. The gas being collected is probably
a) oxygen.
b) carbon dioxide.
c) ATP.
d) vaporized water.
Ans: a) oxygen.
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When bone tissue first evolved in vertebrates, it was found within _____
A) an endoskeleton B) an exoskeleton C) a vertebra D) a skull E) a jaw
Hormone receptors are comprised of two domains, the hormone binding domain and the ____, which triggers the
cellular response.
a. gene activation domain b. DNA-binding domain c. phosphorylation domain d. kinase domain e. phosphatase domain
What is the water potential of phloem relative to the water potential of the surrounding xylem?
a. lower b. higher c. about the same d. exactly the same
Much research is being done to increase the nitrogen-fixing ability of plants with root nodules. Why is this an important goal for agricultural researchers?
A) Decreasing the size of nodules will allow plants to fix more nitrogen into their own molecules. B) Nitrogen is an essential component of the amino acids used to form protein. C) Increasing the nitrogen-fixing ability of plants will allow them to make better use of nitrogen fertilizers. D) Removing the bacteria from the root nodules will allow more fixed nitrogen to be available to the plants.