What are the characteristics of stem cells? Check all that apply.
_____ Totipotent stem cells are part of a committed pathway within one cell lineage that will give rise to one specific cell type.
_____ Pluripotent stem cells are descendants of the totipotent stem cells of the embryo.
_____ A fertilized egg is a type of totipotent stem cell.
_____ Pluripotent stem cells can differentiate into any cell type, except for totipotent stem cells and the cells of the placenta.
_____ Totipotent stem cells are part of a committed pathway within one cell lineage that will give rise to one specific cell type.
__X__ Pluripotent stem cells are descendants of the totipotent stem cells of the embryo.
__X__ A fertilized egg is a type of totipotent stem cell.
__X__ Pluripotent stem cells can differentiate into any cell type, except for totipotent stem cells and the cells of the placenta.
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Diabetes mellitus results from a disorder of glucose uptake by systemic cells and can result in a number of symptoms including high levels of blood glucose and the presence of glucose in the urine . Which of the following is a reasonable explanation for the presence of glucose in the urine?
A. The reabsorption capacity of the kidney for glucose is exceeded. B. A lack of sodium in the filtrate blocks the function of the Na+/glucose symport protein. C. High levels of glucose interfere with ADH function. D. The high levels of glucose induce a "dehydrated" state that promotes production of a large amount of dilute urine. E. None of the choices given are a logical explanation for this observation.
Which of the following human bones is not
necessary for normal functioning?
a. tibia b. ulna c. radius d. fibula e. more than one of these bones is not necessary for normal functioning
Gas exchange in terrestrial insects is accomplished through:A
the use of gills. B. the use of book lungs. C. the use of tracheae. D. diffusion across the epidermal layer. E. a closed circulatory system.
Transgenic bacteria are presently used to make ________ to protect from a possible infection by a disease-causing organism
Fill in the blank(s) with correct word