Thinking of the examples in your book of adaptive radiation, in which of the following environments might you be most likely to find adaptive radiation?
A) in earthworms feeding on detritus
B) among insects that are generalist feeders
C) in fruit flies that feed on different yeast strains specific to different species of cacti in the desert
D) among houseflies living in a garbage dump
Answer: C
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For multicellularity to develop, there must be a mechanism of communication among cells in the multicellular organism. Which of the following structures present in the cell membrane receives signals from the environment?
A. plasmodesmata B. receptors C. gap junctions D. cadherins
Products of tumor-suppressor genes act at control points in the cell cycle. Indicate whether the statement is true or false
If you want to prevent rho-dependent transcription, which sequences would you target to mutate the rho utilization (rut) site?
A) coding region B) start codon C) promoter sequence D) terminator sequence E) stop codon
If two solutions have unequal concentrations of a solute, the solution with the lower concentration is called
A. hypertonic. B. osmosis. C. hypotonic. D. isotonic.