You buy a pie that contains a mixture of cherries and blueberries. When you cut the pie up, you notice that some slices have more blueberries than cherries and other slices have more cherries than blueberries. This uneven distribution of cherries and blueberries is most like the uneven distribution of
A) nuclei in a zygote.
B) nuclei in an early embryo.
C) nuclei in an egg.
D) cytoplasmic determinants in a zygote.
E) cytoplasmic determinants in an early embryo.
Answer: D) cytoplasmic determinants in a zygote.
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Which of the statements best describes the function of telomerase?
A. Telomerase stabilizes the RNA polymerase during bacterial protein transcription. B. Telomerase uses internal RNA as a template for lengthening the DNA single strand and preventing information loss. C. Telomerase is responsible for forming the Okazaki fragments that allow for non-continuous replication. D. Telomerase binds to specific DNA sequences that are not to be replicated and blocks polymerases.
What will be the immediate action of an allergen when it enters the body for a second time?
A. Binding of allergen to adjacent IgE binding sites on mast cells and basophils B. Binding of IgE by the Fc region to mast cells and basophils C. Prostaglandins cause vasodilation and increased vascular permeability D. Degranulation E. Histamine acts on smooth muscle
The 30,000 elephant seals alive today are genetically very similar due to
A) artificial selection. B) natural selection. C) random mutation. D) the bottleneck effect. E) the founder effect.
During cytokinesis in an animal cell, a constricting ring pinches the dividing cell into the two daughter cells. This contractile ring is formed by which of the following structures?
a. Centrioles b. Microtubules c. Microfilaments d. Z discs e. The spindle apparatus