How can a replication error become a permanent mutation?
What will be an ideal response?
When proofreading and repair mechanisms fail, an error becomes a mutation, a permanent change in the DNA sequence of a cell's chromosome(s). Repair enzymes cannot fix a mutation after DNA replication has occurred, because they do not recognize correctly paired bases. Therefore the mutation is permanent and passed on to descendants of the cell.
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Humans with mutations in the AQP1 (aquaporin-1) gene do not produce the AQP1 protein. The absence of AQP1
causes an inability to ____ in these individuals.
a. produce concentrated urine b. recognize thirst c. make large volumes of dilute urine d. control sweating e. salivate
Which of the following is NOT a characteristic of the world’s great forests?Which of the following is NOT a
characteristic of the world’s great forests? a. They produce greenhouse gases. b. They absorb and release water. c. They control soil erosion. d. They control flooding. e. They control sediment buildup in fresh water sources.
Which of the following best describes the effect of cancer-causing mutations on the cell cycle?
A. The mutations increase the speed of the cycle. B. The mutations cause the cell to bypass checkpoints in the cycle. C. The mutations eliminate one or more stages of the cycle. D. The mutations interfere with S stage of the cycle. E. None of these.
The table shows the distribution of the number of bristles in a Drosophila population indicating how many individuals in the population have those particular number of bristles. Calculate the mean number of bristles in the entire population.
a. 4 b. 4.7 c. 13.27 d. 17.14 e. 18.5