A newly identified bacterial pathogen has been shown to cause disease in humans, disrupting the production of some proteins by interfering with the function of the endoplasmic reticulum of liver cells. Under specific growth conditions, this bacterial strain secretes a protein that appears to be responsible for the pathology of the disease. This protein is composed of two polypeptide chains, one of which binds to a receptor on the surface of liver cells, stimulating the uptake of the protein by endocytosis. Once inside the cell, the other polypeptide component interferes with the activity of ribosomes bound to the endoplasmic reticulum. This bacterial protein will most likely be classified as a/an __________.
A) superantigen
B) A-B toxin
C) invasin
D) membrane-disrupting toxin
E) bacterial kinase
Ans: B) A-B toxin
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The most common isotope of carbon has an atomic number of 6 and a mass number of 12, while the
most common isotope of oxygen has an atomic number of 8 and a mass number of 16. A molecule of CO2 made up of these common isotopes has a molecular weight of ____.
a. 28 b. 44 c. 56 d. 14 e. 22
Is it possible to be a "carrier" for achondroplasia (phenotypically normal but capable of passing the allele to one's offspring)?
a. Yes b. No
How does the digestion and absorption of fat differ from that of carbohydrates?
A. Processing of fat does not require any digestive enzymes, whereas the processing of carbohydrates does. B. Fat absorption occurs in the stomach, whereas carbohydrates are absorbed from the small intestine. C. Fat must be partially digested by bacteria in the large intestine before it can be absorbed, which is not the case for carbohydrates. D. Most absorbed fat enters the lymphatic system, whereas carbohydrates directly enter the blood. E. Carbohydrates need to be emulsified before they can be digested, whereas fats do not.
Which of the following is not an arbovirus?
A) West Nile B) La Crosse C) dengue D) Rabies E) Lyme disease