Blanks "A" and "B" should be labeled respectively ____
a. does not gulp; loss
b. does not gulp; gain
c. gulps; loss
d. gulps; gain
e. does not gulp; pump
ANSWER: c
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Gene regulation during development is _____, which means that _____
A. restrictive; genes are successively lost over time B. restrictive; genes lose developmental potential over time C. hierarchical; genes expressed at each stage control the expression of genes that act later D. hierarchical; genes are turned on in a specific sequence, starting with totipotent and ending with multipotent E. combinatorial; genes expressed at each stage control the expression of genes that act later
In desertification ________
a. lands are deserted because chemical contamination makes them unsafe for human habitation b. marginal agricultural lands are deserted to permit the re-establishment of native communities c. large regions of land capable of supporting agriculture are degraded to a desert-like condition d. marginal desert-like tracts of land are rehabilitated and put back into agricultural production
What molecular precursor is converted into l-citrulline by ornithine transcarbamylase at the beginning of the urea cycle?
a. l-arginine b. arginosuccinate c. carbamoyl phosphate d. fumarate
What sort of human cells rely solely on glycolysis as a source of ATP?
a. macrophages b. simple squamous epithelium c. red blood cells d. myocytes