Body parts derived from endoderm include
A) epidermis and dermis of the skin as well as hair and nails.
B) the urinary bladder epithelium, pancreas, and digestive tract lining.
C) all connective tissues, including blood, bone, and cartilage.
D) the linings of the blood vessels, trachea, and body cavities.
B) the urinary bladder epithelium, pancreas, and digestive tract lining.
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A pathologist claims it's much easier to determine the causative agent of meningitis than an infection of the skin or intestines. Is this true? Why or why not?
A. It's not true-an infection is an infection, and it's always difficult to track down the exact causative agent. The organ system involved in the illness has nothing to do with identification of the causative agent. B. It's true-because the central nervous system (CNS) is generally microbe free, whereas the skin and intestines have a diverse normal flora. Separating out a pathogenic causative agent from the normal microbiota in these areas would be much harder to do than in the central nervous system (CNS). C. It's not true-the ventricles of the brain can provide a direct route for microbes to enter the central nervous system (CNS) from the bloodstream/extracellular fluid. Therefore, it would be just as likely to find a pathogenic microbe in the central nervous system (CNS) as it would be in the skin or intestines. D. It's true-there are only 1 or 2 microbes that can cause meningitis, yet there are hundreds (if not thousands) that can cause skin/intestinal infections. This makes it much easier to determine the causative agent for a case of meningitis.
What do you know about the signaling pathway activated by a receptor tyrosine kinase? What other information is related to the question?
What will be an ideal response?
The first human gene therapy was approved for patients suffering ADA (adenosine deaminase) deficiency. In this therapy, lymphocytes were removed from the patient, the normal ADA gene was put into the cells, and the cells were returned to the bloodstream. How was the normal ADA put into the lymphocytes?
A. Via the polymerase chain reaction. B. By fusing normal lymphocytes with deficient lymphocytes. C. Microinjection. D. Via a plasmid vector. E. Via a viral vector.
Use the following graph to answer the following question(s).
The cookies with the least amount of fat had more cells around 500 ?m in size than did the cookies with the most amount of fat.
Answer the following statement true (T) or false (F)