You are asked to participate in a clinical trial for a new drug that can activate telomerase. Which of the following is a likely risk of such a drug?
A. decreased capacity for tissue repair
B. decreased telomere length
C. increased vulnerability to cancer
D. premature aging
Answer: C
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Which of the following protists causes a sexually transmitted disease that can result in infertility?
a. Trichomonas vaginalis b. Trypanosoma cruzi c. Giardia lamblia d. Euglena gracilis
What does the progressive hypothesis of virus evolution state?
a. Viruses originated from self-replicated entities similar to transposons. b. Viruses originated from free-living cells or intracellular parasites. c. Viruses originated from RNA and DNA molecules that escaped from a host cell. d. Viruses originated from alien DNA that was carried to Earth by a meteor.
The chorion of amniotic eggs functions in:
a. supply of food. b. removal of wastes. c. gas exchange. d. protection of the egg. e. absorbing toxins.
Cell surface markers involved in immune reactions
A. are the result of genetic expression. B. aid in cellular development. C. receive and transmit chemical messages among other cells of the system. D. function in recognition of self molecules. E. All of the choices are correct.