Which of the following statements about cancer is incorrect?
A. Cancers are the direct result of mutations in growth-regulating genes.
B. Benign cells are those that have metastasized.
C. Cancer cells can sometimes spread into the bloodstream.
D. Malignant tumors are not encapsulated.
E. Malignant tumors are invasive.
Answer: B
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In analyzing microarray data if the ratio of mRNA present before and after a particular treatment is 1 it indicates that
A. there was no change in mRNA levels before and after treatment B. the gene was not expressed either before or after treatment. C. gene expression could not be detected. D. mRNA was not detected before treatment.
The exotoxin produced by Corynebacterium diphtheriae
A. causes an inflammatory response. B. may destroy cardiac and kidney tissue. C. causes the formation of a pseudomembrane on the respiratory mucosa. D. All of the choices are correct.
The rate of catalysis is proportional to the concentration of the enzyme
Indicate whether the statement is true or false.
Disease-causing viruses or organisms are called ____
a. pathogens b. vaccines c. mast cells d. macrophages e. memory cells