A radioactively labeled protein is made by cells and followed through the various organelles in the secretory pathway. After six hours, all of the radioactivity is still primarily in the Golgi apparatus. This suggests that the
A) protein was not translated by the ribosomes.
B) protein does not possess a signal peptide for localization within the lumen of the rough endoplasmic reticulum.
C) protein possesses a signal for localization within the Golgi apparatus.
D) all of the above
C) protein possesses a signal for localization within the Golgi apparatus.
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Some tentative patterns that are emerging from the study of complex traits are that:
A. some genes involved in complex traits are pleiotropic. B. many genes involved in complex traits show epistasis. C. most genes affecting complex traits have major effects; few have minor effects. D. genes involved in complex traits can show pleiotropy or epistasis. E. genes involved in complex traits can show pleiotropy or epistasis, and most have major affects.
In a food web, which of the below organisms converts the carbon in animal carcasses or waste back to atmospheric CO2? Select all that apply
A. primary producers B. algae C. fungi D. decomposers
Which of the following gives the correct rank order for relative toxicity (most to least) of the primary nitrogenous wastes used by different animals?
A. ammonia ? urea ? uric acid B. uric acid ? ammonia ? urea C. urea ? uric acid ? ammonia D. ammonia ? uric acid ? urea E. urea ? ammonia ? uric acid
DNA is found in every cell of an organism. What subset of DNA changes would be most useful to molecular biologists to determine evolutionary relationships?
A) DNA changes that occur in genes specific to organisms in one kingdom B) DNA changes in genes that are shared by a common ancestor C) DNA changes in genes that occur in body cells and cannot be passed to offspring D) DNA changes in genes that do not generally code for any function