What is the difference between the heartwood and sapwood of a tree?
A) Heartwood contains xylem, and sapwood contains phloem.
B) Sapwood contains xylem, and heartwood contains phloem.
C) Heartwood no longer transports water and minerals, and sapwood still conducts xylem sap.
D) Heartwood contains old phloem that no longer functions, and sapwood contains functioning phloem.
Answer: C
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a. Mollusca. b. Annelida. c. Arthropoda. d. Platyhelminthes.
The highest concentration of cones is in the
a. fovea. b. blind spot. c. sclera. d. iris. e. choroid.
The early experiment by Van Helmont (1600s) describes how he grew a tree in a large pot and found that after five years, the amount of soil in the pot had not changed. He concluded that the increase in weight was due to the addition of water. At that time, the compounds in air had not yet been identified. Today, you know that he only discovered half the story. Which additional experiment would provide evidence for the rest of the story?
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Figure 8.12 In the accompanying figure, the green rectangular shape represents__________.
A. DNA transferase B. DNA helicase C. RNA polymerase D. DNA polymerase E. DNA hybridization