What do seeds contain?
A. embryo and nutritive tissue
B. male gametophyte and nutritive tissue
C. female gametophyte and nutritive tissue
D. mature sporophyte and nutritive tissue
Answer: A. embryo and nutritive tissue
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As electrons are passed through the system of electron carriers associated with photosystem II, they lose energy. What happens to this energy?
A) It excites electrons of the reaction center of photosystem I. B) It is lost as heat. C) It is used to establish and maintain a proton gradient. D) It is used to phosphorylate NAD+ to NADPH, the molecule that accepts electrons from photosystem I.
The observations and research on aphid color changes can most directly be summarized in that
A. Koga and Fugatsu proved that the color change from red to green in aphids was ecologically favorable to survival. B. the method of paper fiber separation of pigment molecules showed that Ricketsiella bacteria were the source of the green coloration of aphids. C. species of organisms can be chemically diverse and affect each other, even among similar groups of aphids and bacteria. D. it turned out that the green appearance of aphids was because of the large amount of green Ricketsiella bacteria coating their bodies. E. All of the answer choices are correct.
Which of the following plants was used as a
bioremediator at the Aberdeen Proving Grounds?
a. hemlock b. poplar trees c. maple trees d. sawgrass e. oak trees
Through the process of cell differentiation ________.
A) each cell develops a characteristic set of structural features B) each cell becomes capable of performing all vital functions C) cells in nearby locations become unable to work together D) each cell becomes able to change its function throughout its life cycle E) None of the answers are correct.