Cystic fibrosis (CF) is an autosomal recessive disorder caused by faulty chloride ion channels in cells lining of the lungs and the pancreas. A man and woman, with no CF symptoms, have an unaffected boy and a daughter with CF. The gene responsible for CF is located on:
a. The X-chromosome
b. The Y-chromosome
c. One of the human chromosomes 1=12
Ans: c. One of the human chromosomes 1=12
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The trace amounts of micronutrients needed by microorganisms are usually supplied as inadvertent contaminants in water and regular media components.
Answer the following statement true (T) or false (F)
Lead is known to undergo biomagnification and accumulate in bones. What do you predict will happen to lead taken up by a tiger after it dies in the wild?
A. The lead will reenter the food web via detritivores and decomposers. B. The lead will be broken down to a non-toxic form. C. The lead will reenter the food web via evaporation and precipitation. D. The lead will be eliminated from the food web because no species prey upon the tiger.
Why are fungi used to clean oil spills?
A. Fungi store the hydrocarbons in their large central vacuoles. B. Fungi use the hydrocarbons in oil instead of CO2 during photosynthesis. C. The chemicals in oil kill off the fungus's competitors. D. Fungi use the organic molecules in the oil as food.
Due to character displacement, two closely related species may differ most morphologically when they
A. occupy the same niche. B. are sympatric. C. occupy different niches. D. share a common ancestor. E. are allopatric.