A process that results in individuals of two populations losing the ability to interbreed is referred to as
a. stabilizing selection.
b. fusion.
c. speciation.
d. differential migration.
c
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You are investigating a particular cell type, and you notice that a protein normally found in the lysosome ends up being secreted from the cell. This appears to be the only thing wrong with these cells
Of the following conditions, which is the most likely cause of this defect in these cells? A. The lysosome leaks the protein out of the cell. B. The signal sequence on the lysosomal protein is defective. C. Transport vesicles responsible for sorting in the cell are defective. D. The pH of the lysosome is not low enough for the protein to remain in it.
A similarity between regulation of the lac operon in bacteria and the regulation of galactose utilization in yeast is that both pathways
A) transcribe all the genes necessary as one polycistronic mRNA. B) use feedback inhibition to stop making their sugars. C) use a modified version of their sugars as inducers. D) are subject to catabolite repression. E) C and D only
Which one of the following is typically removed from the blood by the tubular secretion process?
A) drugs such as marijuana and cocaine B) urea C) protein D) red blood cells E) water
Carbon-12 and carbon-13 are different in the number of their _________.
A. protons B. electrons C. protons and electrons D. neutrons