Which of the following is not true about histone modification and the enzymes that create them?
A. The enzymes responsible are often part of multiprotein complexes that include transcription factors.
B. The enzymes responsible can work with chromatin remodeling complexes to alter specific regions of chromatin in response to environmental signals.
C. The modifications can be passed on by epigenetic inheritance.
D. The enzymes responsible can create histone variants.
E. All of these choices are correct.
D
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Explain why the presence of many Archaea has been confirmed only by community sampling of rRNA genes and not by culture in the laboratory. How has metagenomics helped to solve this problem?
What will be an ideal response?
Minerals move through the tissues of the plant root from the epidermis to the xylem in the center primarily by
a. passive transport with no expenditure of ATP. b. active transport with expenditure of ATP. c. active transport with no expenditure of ATP. d. facilitated diffusion with expenditure of ATP. e. facilitated diffusion without expenditure of ATP.
Which of the following is INCORRECT concerning
Radiolarians? a. They have perforated shells of calcium carbonate. b. They form part of the plankton. c. They use pseudopods for feeding. d. They have vacuoles that impart buoyancy. e. They are heterotrophic protists.
Distinguish between diurnal, nocturnal, and crepuscular animals, and give an example of each. What will be an ideal response?