Which group of fishes evolved first (in other words, is most ancient)?
A. Bony fishes
B. Cartilaginous fishes
C. Lobe-finned fishes
D. Jawless fishes
Answer: D
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In a study of Arabidopsis thaliana researchers determined that:
A. the levels of CO mRNA did not follow a circadian pattern. B. the levels of CO mRNA were high and in sync with the light period when day-lengths were long. C. CO proteins accumulated only in the dark. D. CO proteins are stabilized by dark periods when day lengths are short. E. photoreceptors show no indication of stabilizing CO protein.
Explain the advantages of using recombinant DNA technology to produce human proteins in transgenic plants, animals, or cultured cells
What will be an ideal response?
At equilibrium, the gas molecules that dissolve in solution and those that remain in the gaseous phase are, by definition, at the same
A) concentration. B) temperature. C) volume. D) humidity. E) partial pressure.
You are studying the effects of specific transcription factors on the activation of gene expression. You notice that one particular transcription factor binds far away from the promoter of its target gene. What can explain this?
A. DNA looping brings the transcription factor closer to the promoter and initiates gene transcription. B. The transcription factor transcribes small RNAs that then bind to the promoter and activate the gene's expression. C. The transcription factor tags the enhancer with ubiquitin to stimulate transcription. D. RNA looping brings the transcription factor closer to the promoter and initiates gene transcription.