SCI 115 SCI115 Chapter 3 Quiz Solutions (St. Leo)
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Saint Leo SCI 115 Chapter 3 Quiz Answers
Q. Compare the genetic recipe that builds our hands with the recipe that build’s a fish’s fins. [this question covers the entire chapter – perhaps consider it last!]
Q. What causes a skin cell to be different from, say, a bone cell?
Q. At conception, we start out as a single cell (a sperm cell which has merged with an egg cell). Explain how the plan for our entire body unfolds from the DNA in that single fertilized egg cell (called a zygote).
Q. What are limb buds and what will they develop into?
Q. What happens to development of limbs when the ZPA (zone of polarizing activity) in the limb bud is removed during embryonic development? How does the timing of removal effect development of the limb?
Q. What happens when the ZPA is transplanted to the other side of the limb bud? What happens when a tiny piece of foil is placed between the ZPA patch and the rest of the limb? What conclusion can be made from this experiment?
Q. TRUE or FALSE: The DNA recipe to build upper arms, forearms, wrists and digits is virtually identical in chickens (birds), frogs (amphibians), and mice (mammals). Is the recipe that builds our hands new, or does it have deep roots in ancient ancestral creatures? Explain.
Q. TRUE or FALSE: All of the cells of our bodies – nerve cells, skin cells, bone cells, etc. – contain exactly the same DNA as each other.
Q. TRUE or FALSE: Sharks are the most ancient surviving fish that have paired fins and a skeleton (cartilage) inside.
Q. Explain: How did scientists create “fingers” on skates using a protein from a mouse? What is significant about the results?
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