Experiments involving nuclear transplantation in amphibians indicate that nuclei derived from blastula are more likely to support development of complete and normal adults compared with those derived from later stages of development. What do these
experiments tell us about the process of development?
What will be an ideal response?
Development occurs as a series of cascades, with early genes influencing late genes, at times with stability. Such progressive determination, if stable, may be irreversible and fail to support development of an entire organism from a single cell. A number of epigenetic factors such as chromatin remodeling and DNA methylation are also likely to come into play.
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Enzymes are
a. biological catalysts. b. agents that speed up cellular reactions. c. proteins. d. all of the above.
Chemical interaction competition in plants is called ________
Fill in the blank(s) with correct word
Removal of the 5' G-cap of mRNA transcripts
A) prevents transcript transport. B) leads to degradation by exonucleases. C) extends mRNA half-life. D) leads to polyadelylation. E) reduces mRNA half-life.
Glacier ice occupied about ____% of Earth's land during the last Ice Age, then began retreating about 17,000 years
ago. Today, glacier ice occupies about ____% of the land surface. a. 30; 10. b. 50; 10 c. 73; 50 d. 80; 50 e. 15; 1