Provide an explanation of the differences between differentiation and determination. Provide examples of each process and indicate how each is involved in development
What will be an ideal response?
Determination is the early commitment of a cell to an eventual developmental fate. Differentiation is the set of functional and structural changes associated with the expression of that developmental fate. When nuclei of the developing Drosophila embryo reach the blastoderm stage, they become determined. Differentiation of the cells in Drosophila occurs during metamorphosis. Development, therefore, probably depends first on the determination of cells, then on the differentiation of cells.
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After returning from a trip to Africa, Tom feels tired and weak and has severe anemia. A blood smear reveals a protozoan in his blood and the health care provider diagnoses malaria. Which of the following could be the causative agent of this disease?
A. Taenia solium B. Plasmodium vivax C. Trichophyton rubrum D. HIV E. Giardia lamblia
Explain why radiation affects cancerous cells to a greater degree than noncancerous cells
What will be an ideal response?
Taste buds contain clusters of _____ and supporting cells inside special epithelial papillae
1.chemoreceptors
2.mechanoreceptors
3.photoreceptors
4.thermoreceptors
Refer to the accompanying figure. What will occur when an electrical impulse travels along the neuron labeled as 2?
a. The hand will be extended. b. The hand will be withdrawn. c. The fingers will flex. d. The fingers will extend. e. The hand will remain stationary.