Which one of the following pairings of an aneuploidy and the syndrome it causes is incorrectly
matched?
A. X-chromosome monosomy (X and no Y) causes Turner syndrome.
B. X-chromosome trisomy causes Klinefelter syndrome.
C. Trisomy 21 causes Down syndrome.
D. Trisomy 13 causes Edwards syndrome.
E. Uniparental disomy causes Prader-Willi syndrome.
D
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Tropic hormones:
A. act on other endocrine glands. B. are released from the thyroid gland. C. regulate the metabolic state of the body. D. suppress the immune system. E. suppress the appetite.
Many bacterial pathogens can resist the action of penicillin by
A) Inactivating it with the enzyme penicillinase B) Pumping it out with efflux pumps C) Preventing the entry into the cell D) Using an alternate metabolic pathway drug
Why is there a need to produce Okazaki fragments on the lagging strand, but not on the leading strand of DNA?
A. By having one leading strand and one lagging strand the cell can limit the amount of DNA polymerase used for chromosomal replication. B. There is not enough cellular DNA ligase for bonding Okazaki fragments together if they were produced from both parental strands. C. The two parental strands of DNA are antiparallel and DNA polymerase makes DNA in the 5? to 3? direction only. D. The leading strand opens first, and so Okazaki fragments are not needed. The lagging strand unwinds second resulting in the need to produce Okazaki fragments. E. It is substantially more efficient to make several shorter strands rather than one longer strand of DNA.
Which of the following statements concerning infection with Toxoplasma gondii is FALSE?
A. It is one of the world's most widely distributed protozoan parasites in humans. B. It is typically contracted by eating undercooked meat. C. Even though it can be transmitted across the placenta, it is harmless to the fetus. D. The majority of infected people are asymptomatic. E. It usually results in no permanent damage and is self-limiting.