How does water pass from the root epidermal cells to the xylem in the center of the root?
What will be an ideal response?
Water moves into the epidermal root hairs by diffusion, and the majority of the water moves between cells of the cortex (along the cellulosic cell walls), although some doies flow from cell to cell, through the plasmodesmata. Once it reaches the endodermis, the Casparian strip forces both water and minerals to pass through the endodermal cytoplasm. Minerals are then actively pumped into the xylem, and water follows by osmosis.
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RNA editing by nucleotide insertion and deletion is catalyzed by the:
A. spliceosome. B. editosome. C. deletosome. D. RNase A enzyme.
How does the structure of the cardiac chambers reflect their different functions?
What will be an ideal response?
Why don't the grafted hybrids produce apples with a blend of traits from the scion and the rootstock?
A) The rootstock suppresses activation of the scion genes, which alters fruit production. B) The rootstock is unable to perform photosynthesis and so can't produce fruit. C) Transplanted nuclei from scion cells regulate gene expression in the rootstock. D) The rootstock regulates gene expression in the scion but contributes no genetic information for fruit production.
The generation of a knock-out organism generally requires all the following EXCEPT ________
A) a selectable marker B) embryonic stem cells C) a targeting vector D) knowledge of the sequence product E) knowledge of the target sequence