This type of lipid is found in pigments such as chlorophyll, in the visual pigment retinal, and in rubber:
A. terpene.
B. prostaglandin.
C. wax.
D. steroid.
E. phospholipid.
Answer: A
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Acute viral gastroenteritis is the leading cause of death in
A. children in the United.States. B. children in developing countries. C. children in day care centers. D. children worldwide.
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 of the following statements is true?
A. Lactic acid is a product of aerobic respiration; ethyl alcohol is a product of fermentation. B. Oxygen is a product of cellular respiration; carbon dioxide is a product of photosynthesis. C. Glucose is a product of aerobic respiration; lactic acid is a product of anaerobic respiration. D. Oxidation is the loss of electrons; reduction is the gain of electrons.
d. response to a stimulus
a. order b. sensitivity to stimuli c. reproduction d. adaptation