How do translocation and transpirational flow differ?
What will be an ideal response?
Transpirational flow occurs in xylem cells, which are dead, while translocation occurs in phloem cells, which are alive. Transpirational flow moves water and minerals from root to shoot, while translocation moves dissolved organics from source to sink. Transpirational flow is dependent on evaporation of water, mainly from the leaves, while translocation is dependent on osmotic pressure built up by the active transport of materials into the phloem cells.
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What happens during depolarization?
A. Potassium ions flow out of the cell. B. Sodium ions flow into the cell. C. The sodium/potassium pump protein reverses itself. D. Potassium ions flow out of the cell AND sodium ions flow into the cell.
Which of the following biotechnology applications of site-specific recombination deletes DNA from the target?
A. gene activation by removing a transcriptional stop site B. gene insertion C. allele replacement D. gene activation by adding an enhancer sequence E. gene repression by disrupting transcription with an insertion.
In this step in the identification of the colony that
contains a targeted gene, a. bacterial cells are cloned. b bacterial colonies are transferred. c. bacterial cells are ruptured. d. DNA is lysed. e. cells with the targeted gene are identified.
Which of the following statements is correct? Kinesins and dyneins ____________________
(a) have tails that bind to the filaments. (b) move along both microtubules and actin filaments. (c) often move in opposite directions to each other. (d) derive their energy from GTP hydrolysis.