Paul was an orphan found wandering a city street when he was 2 years old. At age 52, he began to experience muscle spasms and was having difficulty walking. Which of the following genetic disorders is most probable?
A) Marfan syndrome B) Huntington's disease
C) PKU D) CF
Answer: B
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Repeated sequences make DNA sequencing challenging for of all of the following reasons EXCEPT:
A. repeated sequences are typically longer than the short sequences obtained by automated sequencing. B. there is no easy way to determine how many copies of the same repeat are present within one chromosome. C. short repeats may fold back upon themselves to form a double-stranded structure that is not easily sequenced. D. the long repeats often have mutations that are not easily sequenced. E. All of the answer options are challenges to DNA sequencing due to repeated sequences.
Which of the choices best describes macroevolution?
A) Individuals with one genotype reproduce more than individuals with another genotype in a population. B) Mutation creates new alleles that are dominant. C) A new species emerges. D) Dominant and recessive allele frequencies are in equilibrium in a population.
All of the following apply to the deep sea except:
a. temperatures vary greatly in deep waters. b. pressures are very high. c. light is dim or nonexistent. d. the water is extremely cold.
Deserts caused by global patterns of air
circulation are dry because
a. as the moist air above deserts rise, all of the water evaporates b. dry, descending air above deserts draws moisture from the soil c. the moist air above deserts is absorbed by the sandy desert soils d. because of the warm temperatures, all the moisture in the deserts is drawn away and is transported by air currents to the tropics e. all of the air currents above deserts have no contact with bodies of water