DRAW IT On this cross section from a woody eudicot, label a growth ring, late wood, early wood, and a vessel element. Then draw an arrow in the pith-to-cork direction.

What aspect of DNA structure makes it possible for the proteins of nucleotide excision repair to recognize many different types of DNA damage? (d) the regularity of DNA's structure

What aspect of DNA structure makes it possible for the proteins of nucleotide excision repair to recognize many different types of DNA damage? (c) the energy differences between correct and incorrect base pairs

What aspect of DNA structure makes it possible for the proteins of nucleotide excision repair to recognize many different types of DNA damage? (b) the antiparallel orientation of strands in the double helix

You attached a birdfeeder to a tree 5 years ago at a position 6 feet above the ground. The tree has grown since at a rate of 1 foot per year. What is the current height of the birdfeeder?

In the late 1950s, Herbert Taylor grew bean root-tip cells in a solution of radioactive thymidine (a precursor to one of the deoxyribonucleotides in DNA) and allowed them to undergo one round of DNA replication. He then transferred the cells to a solution without radioactive thymidine, allowed them to replicate again, and examined their chromosomes for the presence of radioactivity. His results are shown in the following figure, where red indicates a radioactive chromatid. (b) What would the results of Taylor's experiment be if eukaryotes used a conservative mode of DNA replication?

In the late 1950s, Herbert Taylor grew bean root-tip cells in a solution of radioactive thymidine (a precursor to one of the deoxyribonucleotides in DNA) and allowed them to undergo one round of DNA replication. He then transferred the cells to a solution without radioactive thymidine, allowed them to replicate again, and examined their chromosomes for the presence of radioactivity. His results are shown in the following figure, where red indicates a radioactive chromatid. (a) Draw labeled diagrams of double-stranded DNA molecules that explain the pattern of radioactivity observed in the sister chromatids after the first and second rounds of replication.

Place these tissues in order, starting at the center of a woody stem. (Hint: Review Figure 31.8A). a. vascular cambium b. primary phloem c. epidermis d. primary xylem

Trees can be killed by girdling—the removal of bark and vascular cambium in a ring all the way around the tree. Explain why.