What is the role of the histone proteins of the chromatin?
A) They contain the instructions to build a protein.
B) They act as a spool around which the DNA is wrapped.
C) They help assemble ribosomes.
D) They maintain the nuclear membrane.
B
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Which of the following is NOT a process of aerobic respiration?
A. citric acid cycle B. glycolysis C. acetyl CoA formation D. oxidative phosphorylation E. lactate fermentation
How is pollentube elongation facilitated?
a. Pollen tube growth relies onchemical signals released by the pollen grain. b. Pollentube elongation will occur as long as the pistil provides moisture and energy. c. Chemical cues from female tissues help guide pollen tube growth, but the identity of these chemicals is not known. d. All the details of the chemical interactions between the pollen tube and pistil tissue have been elucidated and are well-described. e. Pollentube elongation occurs only in the absence of chemical cues from the female tissues.
What is the process that can lead to photosynthetic population explosions?
a. Dead zones b. Algal bloom c. Eutrophication d. Water runoff
If a plant species exhibits maternal inheritance for leaf pigmentation, what is the phenotype of the parents of a variegated (green and white leaves) plant?
A. The maternal plant must be white and the paternal plant must be green. B. The maternal plant must be green and the paternal plant must be white. C. Both the maternal and paternal plant must be variegated. D. The maternal plant must be variegated and the paternal plant can be any color. E. The maternal plant must be variegated and the paternal plant must be white.