Without fully functional p53, which checkpoint is compromised?
a. M
b. S
c. G1
d. G2
c. G1
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Oxygen (O2) makes up about 21% of the Earth's atmosphere. The graph below depicts changes in atmospheric O2 levels measured between the years 1990 and 2008. The burning of fossil fuels produces CO2, removing O2 from the atmosphere
It has been estimated that approximately three molecules of O2 are consumed by every single molecule of CO2 produced by fossil fuel combustion. Over about 20 years, a total loss of 0.0317% O2 from the atmosphere was calculated from this data. If you compare this graph to that shown in Figure 25.1, how is the trend in O2 levels related to the trend in CO2 levels? A. Both O2 levels and CO2 levels increase over time. B. Both O2 levels and CO2 levels decrease over time. C. O2 levels decrease as CO2 levels increase. D. O2 levels increase as CO2 levels decrease.
For a complex trait that is observed less frequently in a given sex in a given family, the recurrence risk for this trait is ____________________ for future children of that sex
Fill in the blank(s) with correct word
Weak selection against the dominant phenotype
a. reduces the equilibrium frequency of the dominant genotypes b. completely eliminates the dominant genotypes c. has no effect on the dominant genotypes
Which process is responsible for the conversion of DNA information into messenger RNA?
a. replication b. transcription c. duplication d. translation
e. synthesis