You examine cells with a microscope and detect two Barr bodies in each cell. What is the most likely genotype of the cells?
A) XX
B) XY
C) XO
D) XXY
E) XXX
E) XXX
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Living organisms are members of all of the levels
listed below; however, rocks are components of a. the community. b. the population. c. the ecosystem. d. the biosphere. e. both the ecosystem and the biosphere.
In order to increase blood glucose levels, what hormone is secreted by the pancreas to stimulate the liver to convert stored glycogen into glucose?
A) insulin B) gastrin C) glucagon D) cholecystokinin
Which point mutation would be most likely to have a catastrophic effect?
A) The deletion of three bases near the start of the coding sequence B) A base insertion near the end of the coding sequence C) A base deletion near the end of the coding sequence D) A base substitution E) A base deletion near the start of the coding sequence
In the tryptophan operon, low level of tryptophan nutrient results in the following events EXCEPT
A) that the synthesis of leader peptide is stalled. B) continuous transcription of the trp operon. C) that tryptophan repressor cannot bind to trp operator in the trp operon. D) synthesis of polycistronic mRNA of tryptophan structural genes. E) that regions 3 and 4 form a stem-loop.