Cultivated wheat is descended from three distinct species, each with a diploid set of 14 chromosomes. Thus, it is
A) an allotriploid with 21 chromosomes.
B) an allotriploid with 42 chromosomes.
C) an allohexaploid with 84 chromosomes.
D) an allohexaploid with 42 chromosomes.
E) an autotetraploid with 28 chromosomes.
D
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What is not an ecological role of mangals? a. They stabilize sediments with their root system
b. They provide detritus for food chains to occur. c. They are direct subjects of herbivory. d. They serve as a nursery and refuge to animals.
Consider a typical food chain. Which level would be at the greatest risk of suffering from exposure to
a toxin based on the concept of biological magnification? What will be an ideal response?
Which of the following molecules is not grouped with the lipids?
a. prostaglandins. b. steroids. c. cholesterol. d. carotenoids. e. glycoproteins
A 0.01 M solution of a substance has a pH of 2. What can you conclude about this substance?
A) It is a strong acid that dissociates completely in water. B) It is a strong base that dissociates completely in water. C) It is a weak acid. D) It is a weak base.