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 utilize different transcription factors
E. they express different genes and utilize different transcription factors during development
E. they express different genes and utilize different transcription factors during development
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An embryo with no SRY gene develops into a
__________. Fill in the blank(s) with the appropriate word(s).
Changes in what frequencies are at the core of how evolution occurs?
What will be an ideal response?
The half-life of carbon-14 is 5,600 years. A fossil that has one-eighth the normal proportion of carbon-14 to carbon-12 is probably
A. 5,600 years old. B. 11,200 years old. C. 22,400 years old. D. 2,800 years old. E. 16,800 years old.
Figure 8.4
What type of virus particle is illustrated in the figure?
A. Rhinovirus B. Adenovirus C. Bacteriophage D. HIV E. Rotavirus