Crabs have claws on their front legs and many sets of walking legs (which lack claws) on segments posterior to the claws
Crabs can regenerate legs if they are lost. A walking leg was removed and tissue from the claw was trans-planted onto the stump. If homeobox genes are responsible for the differentiation of leg types, what would you predict would happen to the regrown claw? What might be an analogous experiment from this chapter?
What will be an ideal response?
ANS:
The walking leg was transformed into a claw because of signals from the claw tissue. This is analogous both to what happened with the neural crest transplantation experiment and the homeotic transformation experi-ments.
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a. 102 b. 103 c. 104 d. 105
These bacteria can live in water of very high salt concentration.
A woman develops liver inflammation, a high fever, and a severe decline in red blood cell numbers. Her blood is filled with a parasitic, single-celled organism
When asked about any recent travel, she tells the nurse about her trip to a tropical rain forest. It was a great trip except for the huge number of mosquitoes that bit her. She is probably infected with A) Trichomonas. B) Trypanosoma. C) Euglena. D) Giardia. E) Plasmodium.
The location of translation in prokaryotic cells is
A. on mesosomes. B. on chromosomes C. on ribosomes. D. in the nucleoid. E. on the plasma membrane.