Why would a photosynthetic organism have more than one type of pigment within their cells?
a. To provide a backup source of energy if the main pigment type fails
b. To direct light towards the primary pigment
c. To optimize the amount of energy that can be harvested in specific environments
d. To provide structural support for the primary pigments
e. To allow photosynthesis to occur at any time of the day
c
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Mitochondria are proposed to have evolved before chloroplasts based on which observation?
A. All organisms have mitochondria and conduct cell respiration. B. Mitochondria are larger, with more complex structures than chloroplasts. C. Mitochondria produced the oxygen found in the atmosphere. D. All eukaryotes have mitochondria, but not all eukaryotes have chloroplasts. E. All prokaryotes have mitochondria, but not all prokaryotes have chloroplasts.
ATP contains
a. alanine. b. arginine. c. phosphate. d. tyrosine. e. glucose.
Long term, heavy drinking can lead to ____, a disease characterized by inflammation and destruction of the liver
a. hepatoblastoma b. gall stones c. fatty liver disease d. jaundice e. hepatitis
What key factor limits the number of trophic levels in an ecosystem?
a. maximum solar radiation b. energy loss c. herbivore size d. predator size e. climate