Which of the following flagellates has a single nucleus in the cyst and the typical curved, cytostomal fibril, which is called a shepherd's crook?
a. G. duodenalis
b. C. mesnili
c. D. fragilis
d. E. hominis
B
C. mesnili contains a cytostome with supporting fibrils, which are usually visible in a stained preparation. A curved fibril along the side of the cytostome is usually referred to as a shepherd's crook.
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Which eukaryotic organelle(s) contain its/their own DNA?
a. chloroplasts only b. endoplasmic reticulum only c. mitochondria only d. mitochondria and chloroplasts e. mitochondria and endoplasmic reticulum
The underlying problem in Gaucher disease is ____
a. the spontaneous breakdown of red blood cells b. the accumulation of fat in white blood cells c. the breakdown of the myelin sheath around nerves d. a hypertrophied spleen e. the lack of critical liver enzymes
In an experiment on the effects of deforestation of a portion of a northern temperate deciduous forest, all the trees were removed from a small mountainside watershed area and herbicides were applied for three years to prevent regrowth. Measurements of the concentration of calcium (an important nutrient) in runoff water were taken both before and after the deforestation. Monthly measurements also were made in a similar watershed in another part of the same forest that had been left undisturbed. The findings are displayed in the graph below. (There is an image in your packet #101-105) 2002 test Which of the following factors affecting the hydrologic cycle would have the LEAST impact on calcium loss from the disturbed watershed?
(A) Total precipitation (B) Surface runoff (C) Evaporation (D) Transpiration (E) Porosity of soil
When Mendel used true-breeding white flowers and true-breeding purple flowers as the parental generation, what were the results? (Purple flower is dominant over white.)
A) All of the offspring had purple flowers. B) Three-quarters of the flowers produced were white and one-quarter were purple. C) One-half of the flowers produced were white and one-half were purple. D) Three-quarters of the flowers produced were purple and one-quarter were white. E) All of the offspring had white flowers.