Temporal isolation and mechanical isolation are reproductive isolating mechanisms that are classifiedas:a
homozygotic barriers.
b. prezygotic barriers.
c. heterozygotic barriers.
d. postzygotic barriers.
e. homozygotic barriers.
B
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Which of the following foods are highest in naturally occurring sugars?
If one strand of DNA has the nitrogenous base sequence ATTCGACGCTA, then the complementary strand has the nitrogenous base sequence
A. TAAGCTGCGAT. B. ATCGCAGCTTA. C. UAAGCUGCGAU. D. ATTCGACGCTA.
Courtship for Anolis lizards involves the male displaying a dewlap (skin under the throat area) that varies in appearance based upon the species. Lizards that are found in darker, more shaded environments will have dewlaps that are lighter in color because they are more noticeable by potential mates. Which of the following mechanisms best explains how speciation is at work in this example?
A. Genetic drift B. Postzygotic isolation C. Natural selection D. Reinforcement
Respond to the following statements with reference to the five plant macronutrients listed below.
A. This nutrient is an important component of proteins and nucleic acids. B. This nutrient helps to maintain turgor pressure in stomata. C. This macronutrient is a main component of all biological molecules. D. This nutrient is essential to formation of chlorophyll and acts as a cofactor for many enzymes. E. This nutrient is a component of ATP.