Which of the following are NOT found within the photosynthetic gene cluster of Rhodobacter (a purple phototrophic bacterium)?
A) genes encoding reaction center and light-harvesting photocomplexes
B) genes encoding proteins involved in phycobiliprotein biosynthesis
C) genes encoding proteins involved in bacteriochlorophyll biosynthesis
D) genes encoding proteins involved in carotenoid biosynthesis
Answer: B
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The ____________________ provides protection from discrimination based on one's genetic information
Fill in the blank(s) with correct word
Genes are precisely copied during the process of DNA replication and never undergo any change
a. True b. False
Africa, Asia, South America, and Antarctica share some patterns of primitive (fossil) plants and early reptiles, but do not have similar mammal populations. These findings
A. suggest that a pattern of land bridges existed at different times in geological history. B. suggest that the mammals evolved earlier while continents were joined, but plants and reptiles radiated into diverse groups after separation. C. cast serious doubts upon the theory of continental drift and fused land masses. D. are an unsolved puzzle probably due to the random nature of biological evolution. E. suggest that the earlier plants and reptiles evolved while continents were joined, but mammals radiated into diverse groups after separation.
Aphids pierce the tissues of plants with their tubular mouthparts and suck out the phloem juices
Because this food is mostly sugar water with a low concentration of protein, the aphids have to process large volumes of it to obtain sufficient protein. Most of the excess sugar and water passes right through the aphids' digestive tracts and is defecated as "honeydew," which is actively sought out and eaten by some ants. The ants will even "milk" honeydew by stroking the aphids. In return, ants protect their aphids from predators, even going so far as taking them inside overnight. The relationship between the aphids and ants is called A) predation. B) parasitism. C) competition. D) mutualism.