With regard to cancer cells in the process of metastasis to secondary sites, which of the following statements is not correct?
A) If they enter via lymphatics, cancer cells may multiply in regional lymph nodes.
B) Many cells from the primary mass may enter circulation.
C) The population of cancer cells in the bloodstream is monoclonal.
D) Very few cancer cells survive the bloodstream.
E) The population of cancer cells is heterogeneous.
C) The population of cancer cells in the bloodstream is monoclonal.
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Annual influenza vaccinations are important for all individuals because
A. the virus is stable so once the vaccine is administered, protection from antibodies is lifelong. B. the highly contagious nature of the virus means that transmission from a robust individual to those with a weaker immune system, such as the young or the elderly, is facilitated in crowded winter conditions. C. the oral-fecal transmission route makes it easy to pass to others. D. the vaccine prevents secondary infections in individuals with influenza.
Which of the following does NOT lead to development of penicillin resistance?
a) acquisition of a beta-lactamase gene b) direct binding to the bacterial ribosome c) loss of transpeptidase affinity for penicillin d) a modification in the cell wall that blocks penicillin entry
Examine Figure 48.2 in your text. According to this figure, __________ are the top two energy consuming countries in the world, whereas __________ are the bottom two
A. Canada and the United States; Bangladesh and Kenya B. Kuwait and the United Arab Emirates; Mozambique and Sierra Leone C. Bangladesh and Kenya; the United States and Canada D. Mozambique and Malawi; Australia and the United States E. None of the above.
From earliest to latest, the overall sequence of early development proceeds in which of the following sequences?
A) first cell division ? synthesis of embryo's DNA begins ? acrosomal reaction ? cortical reaction B) cortical reaction ? synthesis of embryo's DNA begins ? acrosomal reaction ? first cell division C) cortical reaction ? acrosomal reaction ? first cell division ? synthesis of embryo's DNA begins D) acrosomal reaction ? cortical reaction ? synthesis of embryo's DNA begins ? first cell division