Abscisic acid synthesized in the root travels to different parts of the shoot where it regulates transpirational water loss. What is the most likely way that ABA travels from the root to the various locations within the shoot?
A. sieve tubes
B. from cell to cell through the plasmodesmata
C. vessels and tracheids
D. between cell walls
Answer: C
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The Hardy-Weinberg principle is applicable provided that migration:a
does not occur. b. is limited to adults. c. is limited to juveniles. d. only occurs during nonreproductive periods. e. occurs at the beginning of the breeding season
The fluid-mosaic model considers the cellular membranes to consist of ________ layer(s) of phospholipid molecules and that the individual phospholipids are able to move about within the structure of the membrane.
A. 1 B. 2 C. 3 D. 4
Nearly all echinoderms are found in which habitat?
A) beaches B) rivers C) ocean floor D) ocean surface E) lakes