How does determination relate temporally to differentiation?
What will be an ideal response?
Determination occurs when a cell's developmental fate is set, whereas differentiation is the expression of that determined state. Determination occurs before differentiation.
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The common ancestor to snails, insects and vertebrates lived approximately ________ years ago
a. 85 million b. 275 million c. 500 million d. 110 million e. 400 million
Muscle cells are produced by
a. the ectoderm. b. the endoderm. c. the mesoderm. d. the ectoderm and endoderm. e. all of the germ layers.
Which of the following trophic levels would contain the lowest quantity of energy (kcal per m2)?
a. secondary consumers b. tertiary consumers c. herbivores d. producers e. primary consumers
Which of the following is related to an increase in the chance of breast cancer?
A) breast-feeding B) early first menstruation C) early menopause D) pregnancy