Were predators present in every pond?
a. yes
b. no
b
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Consortia of a phototrophic green sulfur bacteria and motile heterotrophs are found worldwide in freshwater stratified sulfidic lakes
Indicate whether the statement is true or false.
Which of the following is true about telomeres and immortality?
A. Immortal cell lines lack telomeres. B. Immortal cell lines lack telomerase. C. Reactivation of telomerase in humans will cause them to become immortal. D. Tumor cell lines can be immortal if their telomerase gene is reactivated. E. Immortal cell lines have telomerase activity but cannot form t-loops and don't have protective proteins to prevent recombination repair.
Which of the following structural motifs promotes dimerization?
A. Zinc finger B. Leucine zipper C. Helix-turn-helix D. Helix-loop-helix
The transpiration pull is due to the ________ that causes water to move up through the xylem that begins at the surface of mesophyll cells.
Fill in the blank(s) with the appropriate word(s).