The disease sickle cell anemia is an example of what can happen if
A) the diet is deficient in iron.
B) there is insufficient heme in the hemoglobin.
C) a gene for adult hemoglobin is abnormal.
D) red blood cells bind too much oxygen.
E) hemolysis is prevented by a mutated gene.
C
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When solution concentration is measured in moles of solute per kilogram of solvent, that measurement is known as _________
Fill in the blank with correct word.
The five functional types of epithelia are listed below. Match each type with its location and/or description.
1. Found in the epidermis, esophagus, and mouth, these stacked layers of cells prevent exchange, while they resist chemicals, bacteria, and other destructive forces. 2. This tissue actively and selectively regulates the exchange of nongaseous material, such as ions and nutrients, and can be regulated in response to various stimuli. 3. These thin, flattened cells allow the rapid passage of O2 and CO2 through the cells of the lungs and of certain blood vessels. 4. These cells produce a substance and release it, either onto a surface or directly into the blood. 5. This tissue is composed of cells with membrane extensions that beat in a coordinated fashion to move fluid and particles across the tissue. A. exchange B. transport C. ciliated D. protective E. secretory
Which structures create the blood brain barrier (BBB)?
A. Gap junctions between ependymal cells and endothelial cells that form the capillary walls B. Tight junctions between endothelial cells that form the capillary walls C. Gap and tight junctions between astrocytes and endothelial cells that form the capillary walls D. Gap junctions between endothelial cells that form the capillary walls E. Desmosomes and tight junctions between astrocytes and ependymal cells that form the capillary walls
What is the glutamic acid made from transamination used for?
A. It enters the citric acid cycle. B. It is used to make other nonessential amino acids. C. It is used to produce ATP. D. None of the choices are correct.