An embryonic stem cell has the potential to differentiate into any cell or tissue type. Is it differentiated, pluripotent, or totipotent?
What will be an ideal response?
totipotent
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The vessels that carry blood away from the heart in a closed circulatory system are referred to as
A. arteries. B. veins. C. capillaries. D. sinuses. E. auxiliary hearts.
Why are steroid hormones bound to carrier proteins in the blood?
a. to prevent them from entering non-target cells b. to keep them in an inactivate state c. to mask hydrophobic groups on the steroids to allow for circulation in the blood d. to help them bind to surface receptors and trigger a cellular response e. to help them bind to surface receptors and trigger endocytosis
Without _____, humans might have a tail
a. differentiation b. epigenetics c. cell migrations d. apoptosis e. the maternal gene effect
Two new species of plants that are morphologically similar (same leaf type, similar reproductive structures, etc.) are discovered. The botanist who discovers these plants determines that one species possesses sixteen chromosomes and the other species has thirty-two chromosomes. Both plants contain multiple sets of the same eight distinctly different chromosomes. The most probable explanation for these findings is that the second plant evolved from the first by
A. divergent evolution. B. convergent evolution. C. adaptive radiation. D. polyploidy.