The basement membrane of epithelial tissues produces a waterproof barrier of cells to protect the tissue above it
Indicate whether the statement is true or false
FALSE
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Answer the following statements true (T) or false (F)
1. Red blood cells are derived from endoderm. 2. The posterior end of the neural tube will develop into the brain. 3. Cleavage occurs after implantation into the lining of the uterus. 4. The probability of the immune system attacking a transplanted organ as opposed to transfused blood is higher.
The most definitive test to diagnose a helminth infection is
A. a good medical history of the patient, including recent foreign travel. B. an ova and parasite smear for microscopy. C. a serological test for the presence of anti-helminthic antibodies. D. a blood cell count to look for elevated levels of eosinophils.
In a certain variety of plants, a cross between a red-flowered plant and a white-flowered plant
produced an all-red flower F1. In the F2 there were 140 red, 50 cream, and 65 white. (a) Offer an explanation for this F2 ratio. (b) What ratio would be produced in a testcross of the F1 hybrid? (c) What ratio would be produced if all the white F2 plants were crossed among themselves? What will be an ideal response?
The part of the stomach designated by the letter “A”
in the above figure is called a. pyloric sphincter. b. esophagus. c. mucosa. d. duodenum. e. none of these.