Normal cells die in a nutrient medium containing thymidine and methotrexate, whereas mutant cells defective in thymidylate synthase survive and grow. The mutant cells grow because the medium contains the they are unable to make normal cells, however, continue to synthesize their own and thereby convert their limited supply of to . The methotrexate inhibits , so cannot be regenerated. Without a supply of for the synthesis of nucleotides and amino acids, the cells die.
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Biology, 21.06.2019 20:20
2. what process do mrna and trna work together to complete? (3 points)
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Biology, 21.06.2019 22:20
Put the following steps of the convection process in the correct order. 1. gravity pulls cooler matter downward. 2. the matter expands and decreases in density. 3. an up-and-down flow of matter produces a convection current. 4. matter is heated. 5. warmed matter is forced upward. question 2 options: a) 4, 2, 5, 1, 3 b) 2, 4, 3, 1, 5 c) 3, 2, 5, 4, 1 d) 1, 4, 2, 5, 3
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Biology, 21.06.2019 22:20
Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?
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Normal cells die in a nutrient medium containing thymidine and methotrexate, whereas mutant cells de...
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