Double fertilization occurs when
A. the polar nuclei fuse with the egg after it has fused with the sperm.
B. the sperm and tube nuclei fertilize the egg.
C. two sperm cells fertilize the two polar nuclei.
D. one sperm fuses with the egg and the other sperm fuses with both polar nuclei.
Answer: D
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If the antenna complex did not exist in a particular plant mesophyll cell, what effect would that have on photosynthesis?
A. There would be no expected effect on photosynthesis B. These cells would be unable to absorb any light energy C. These cells would have a reduced capacity to generate glucose D. These cells would be able to fix more carbon dioxide Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the light reactions, photo systems, and antenna complexes? What other information is related to the question? Choose Answer Do you have the necessary information to dissect the problem? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The growth hormone is called
a. prolactin. b. adrenalin. c. thyroxine. d. ACTH. e. somatotropin.
?-Glucose is present in potatoes and ?-glucose is present in wood. Both are glucose molecules but one can be used by humans to synthesize ATP and one cannot. Based on this information, what is the best explanation on why humans can only digest one of the glucose types?
A. ?-Glucose and ?-glucose are stereoisomers with OH groups oriented differently. B. ?-Glucose is C6H12O6 and ?-glucose is C5H12O6. C. Only ?-glucose can form polysaccharides. D. ?-Glucose is a chain and ?-glucose is a ring.
Which site on the ribosome is never occupied by a tRNA linked to a nascent polypeptide chain?
A. the A site B. the P site C. the E site