Future kidney cells and heart cells can differentiate into their respective specialized cell types because
A. they express a different set of genes during development.
B. they possess different genes.
C. they arise from different embryonic stem cells.
D. they express different transcription factors.
E. they express different genes and different transcription factors during development.
E. they express different genes and different transcription factors during development.
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Animal cells are permeable to water and urea but NOT to sucrose. The inside of a cell contains 1 M sucrose and 1 M urea and the outside 1 M sucrose and 2 M urea. The solution inside with respect to outside the cell is
A. hypotonic. B. turgid. C. isotonic. D. saturated. E. hypertonic.
Old man's beard (Usnea trichodea) and yellow Evernia lichens are sensitive to elevated levels of ____
a. sulfur dioxide b. nitrogen oxides c. nitrate d. sunlight e. fluoride salts
The first evidence of a connection between genes and metabolism came from studies of alkaptonuria
conducted by ____.
a. Beadle and Tatum b. Griffith c. Watson and Crick d. Garrod e. Nirenberg and Leder
Each end of a long bone is called a(n)
a. diaphysis. b. metaphysis. c. osteons. d. epiphysis. e. lacuna.