Cancer can originate in any area of the body. However, death rates are often highest for those cancers involving organs within the digestive, cardiovascular, and respiratory systems. This is most likely because
A. these organs play vital roles in maintaining homeostasis.
B. there are no treatment options for these types of cancer.
C. these organs are larger and therefore harder to treat.
D. these organs are all involved in processing food, which is vital to our survival.
Answer: A
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In bacteria, fungi, and plants the high internal pressure generated by osmosis is counteracted by the mechanical strength of their
A. plasma membranes. B. organelles. C. cytoskeletons. D. cell walls.
Which of the following is not a characteristic of lipid A?
A. Toxic in nanogram amounts B. Heat stable C. Weakly immunogenic D. Neurotoxic
In chordates, which mesoderm structure forms during gastrulation and provides structural rigidity along the dorsal anterioposterior axis of the embryo?
A. neural tube B. archenteron C. notochord D. intestinal tract E. epidermis
Which of the following statements regarding the association of hepatitis B with liver cancer is FALSE?
A. Geographic areas with a high incidence of liver cancer also have a high prevalence of hepatitis B. B. The HBV genome has been found integrated into hepatic cancer cells. C. Hepatic cancer cells typically express HBV antigen. D. Chronic carriers of the virus are 200 times more likely to develop hepatic cancer. E. Vaccination does not provide protection against the development of hepatic cancer.