An oncologist (a physician who specializes in cancer) compares two biopsy samples by looking at the percentage of cells in mitosis. Sample 1 has 15% of cells in mitosis, and sample 2 has 8% of cells in mitosis
These samples are of the same tissue type. Which sample is likely to be cancerous, and why? Why is it important that the two samples being compared came from the same tissue type?
Sample 1 is more likely to be cancerous because of the elevated level of mitosis. The samples must be of the same variety in order to make a comparison because different types of tissues have different rates of mitosis.
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The type of contraception that prevents implantation
(even after successful fertilization) is a. tubal ligation. b. spermicidal jelly. c. birth control pills. d. morning-after pills. e. a diaphragm.
In the formation of biofilms, such as those forming on unbrushed teeth, cell signaling serves which function?
A) formation of mating complexes B) aggregation of bacteria that can cause cavities C) secretion of substances that inhibit foreign bacteria D) digestion of unwanted parasite populations
The best contraceptive device to prevent the spread of sexually transmitted diseases is the
A. condom. B. diaphragm. C. IUD. D. contraceptive pill.
Please match the diseases with their most common portal of exit.
Infectious mononucleosis A) Respiratory tract (aerosols) B) GI tract (saliva droplets) C) Exudates from skin lesions D) GI tract (diarrhea) E) Reproductive tract (semen) F) Blood through a contaminated needle