Normal fruit flies have red eyes. Flies with mutations that block the function of the X-linked white gene have white eyes. The wild-type allele is completely dominant to mutant alleles. A white-eyed female fruit fly is mated to a red-eyed male. One of their hundreds of female progeny is white-eyed. What is the likely karyotype of this white-eyed daughter?
A) XX
B) XXY
C) XO
D) XXX
E) XYY
B) XXY
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Which of the following statements best describes the habitats of Acidovorax, Sphingobacterium, and Sphingomonas?
a. Habitats are limited to the upper respira-tory tract of various mammals. b. Habitats are unknown. c. Habitats are limited to the soil and water environment. d. Habitats are limited mostly to water sources.
If an isotope's half-life is 100 years
A. in 50 years, only half of the atoms in a sample of that isotope will remain. B. that isotope will no longer exist in 50 years. C. that isotope will no longer exist in 200 years. D. in 200 years, only half of the atoms in a sample of that isotope will remain. E. in 100 years, only half of the atoms in a sample of that isotope will remain.
If you were asked to genetically modify cows to increase their production of macrophages, you would want to increase the production of
A. lymphocytes. B. basophils. C. eosinophils. D. monocytes. E. neutrophils.
On a lab bench, there are four balloons filled with identical volumes of different salt solutions: 0% (balloon
A), 5% (balloon B), 10% (balloon C), and 15% (balloon D). There are also four beakers each filled with identical volumes of a 10% salt solution. The balloons are semi-permeable; that is, only water can enter and exit the balloon. All four balloons are placed in separate beakers at the same time and are allowed to come to equilibrium. Which is the correct order of balloon volumes at equilibrium, from largest to smallest? A) A < B < C < D B) D < C < B < A C) D < B < A < C D) All balloons will be of equal volume at equilibrium.