Which of the following best supports the hypothesis that the difference in leaf color is genetically controlled?
(A) The number of yellow-leaved seedlings in dish A on day 7
(B) The number of germinated seeds in dish A on days 7 and 14
(C) The death of all the yellow-leaved seedlings
(D) The existence of yellow-leaved seedlings as well as green-leaved ones on day 14 in dish B
Ans: (D) The existence of yellow-leaved seedlings as well as green-leaved ones on day 14 in dish B
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Which of the following is NOT true of LINEs and SINEs?
A. Both are non-LTR transposons. B. Both require reverse transcriptase. C. Both transcribe RNA in the nucleus. D. Both are nonautonomous elements. E. LINEs and SINEs both reintegrate by the same mechanism as all non-LTR transposons (target primed).
One generalization of the cell theory is that
a. all cells have a nucleus. b. all cells have cell walls. c. the cell is the smallest unit that displays the properties of life. d. cells can arise from nonliving matter. e. all cells are microscopic.
Thoughts, memories, and the ability to understand begin in the ____
a. cerebral cortex b. hypothalamus c. brain stem d. association areas e. language centers
Generally speaking, vaccinations are effective in combating future infections because they induce the production of
A. helper T cells. B. neutrophils. C. prostaglandins. D. mutations in the host genome. E. memory cells.