Eric goes to the doctor to determine the cause and source of the pain. The physician orders a CT scan, which shows that Eric has an enlarged and inflamed appendix (an organ associated with the digestive system). Eric asks the physician why she didn't just take an x-ray of his belly region. She explains an x-ray would not be the best diagnostic imaging tool in this case because:
a. x-ray images are more expensive to produce than CT scans.
b. soft-tissue structures don't show up well on basic x-rays.
c. the x-rays could inflame the appendix further and cause it to burst.
d. x-rays now are used primarily for bone injuries only
b. soft-tissue structures don't show up well on basic x-rays.
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Phospholipase C cuts membrane phospholipids into
A) PIP2 and DAG. B) PIP2 and IP3. C) Ca2+ and DAG. D) DAG and IP3.
Which of the following is CORRECTLY matched with its description?
A. Cell identity molecules - are primarily steroids B. Carrier proteins - move bound ions or molecules from one side of the membrane to the other C. Channel proteins - catalyze chemical reactions inside the cell D. Peripheral proteins - penetrate the lipid bilayer from one surface to the other E. Receptor proteins - move specific ions or molecules using ATP
Which of the following is a characteristic of mature red blood cells?
A. They have numerous mitochondria. B. They lack a nucleus. C. They play an important role in immune defense. D. They carry most of the carbon dioxide that is transported in the blood. E. They are able to undergo mitosis.
Blood flows from the fetus to the placenta through paired
A) umbilical vein. B) iliac veins. C) umbilical arteries. D) uterine veins. E) uterine arteries.