An activator is to an enhancer as a(n) ________ is to a silencer.
A. repressor
B. transcription factor
C. mediator
D. inducer
E. RNA polymerase II
Answer: A
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The formation of polyploids in plants is an example of which model of cladogenesis?
A. Parapatric speciation B. Allopatric speciation C. Sympatric speciation
Which have a collagen cuticle, a pseudocoelom, a tubular digestive system and no respiratory or circulatory organs?
a. roundworms b. cnidarians c. flatworms d. annelids e. porifera
You have discovered a gene that appears to be crucial to the development of the nervous system in C. elegans. However, you have been unsuccessful in creating embryos in which this gene is knocked out. How might you study the function of this gene in C
elegans without creating a "knockout" mutant? A) CRISPR/Cas targeted gene disruption B) RNAi gene knockdown C) transcriptional activator-like effector nucleases (TALENs) targeted gene disruption D) next-generation sequencing. E) restriction endonuclease mapping.
Why can some plants be cloned from a single cell?
A) Plant cells do not differentiate even when mature, so any cell can grow into an entire plant. B) Plant cells can dedifferentiate and give rise to all of the specialized cells required to produce an entire plant. C) Plant cells can produce genes to replace those lost during development. D) Plant cells are capable of self-renewal by utilizing cellular components from adjacent cells.