Transposons are
A) proteins that are stable.
B) proteins that are unstable.
C) DNA segments that are stable.
D) DNA segments that are unstable.
E) DNA segments that code for proteins.
D
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A straight-line diagram illustrating the flow of food energy from prey to predator is referred to as a food ________
Fill in the blank(s) with correct word
A botanist identifies a new species of plant that has 32 chromosomes. It grows in the same habitat with three similar species: species A (2n = 14), species B (2n = 16), and species C (2n = 18). Which of the following is a possible mechanism by which the new species could have arisen from the others?
a. Either autopolyploidy due to a nondisjunction in the formation of gametes of species B or allopolyploidy associated with hybridization between species A and C b. Allopatric divergence by development of a mechanical reproductive isolating mechanism c. Autopolyploidy due to a nondisjunction in the formation of gametes of species B d. Allopolyploidy associated with hybridization between species A and C e. Change in a key developmental gene that causes the plants to flower at different times
Which group of organisms are likely to live in the low tide zone?
a) Hermit crab, rock weed, sea lettuce b) Rock louse, periwinkle, limpet c) Buckshot barnacle, striped shore crab d) Sea star, brittle star, sea urchins
An ecologist who focuses on the individual could study all of the following, except
A) morphology. B) physiology. C) behavior. D) death rate.