Arthur Kornberg and his colleagues incubated an extract of E. coli with a mixture of dATP, dTTP, dGTP, and dCTP. Only the dTTP was labeled with 32P in the a-phosphate group. After incubation, the mixture was treated with trichloroacetic acid to precipitate DNA, but not the dNTPs. The precipitate was collected, and the extent of [32P] dTMP incorporated into DNA was determined. If any one of the dNTPs were omitted from the incubation mixture, would radioactivity be found in the precipitate? Pick the answer choice.

a. Yes. In the absence of any one dNTP, the polymerase would incorporate the alternative purine or pyrimidine (e. g., insert thymidine if cytosine was missing). Thus, the [32P]dTMPs would be found in the precipitate.
b. No. In the absence of any one dNTP, the polymerase would stop incorporating the other three dNTPs as soon as it encountered a template residue that should pair with the missing dNTP, and incorporation of 32P would be undetectable.

Mantle convection  is the slow  creepingmotion of earth's solid silicate  mantle  caused by  convection  currents carrying  heat from the interior  to the planet's surface.[1][2]  the earth's surface  lithosphere, which rides atop the  asthenosphere  (the two components of the  upper mantle), is divided into a number of  plates  that are continuously being created and consumed at their opposite  plate boundaries. accretion occurs as mantle is added to the growing edges of a plate, associated with  seafloor spreading. this hot added material cools down by  conduction  and  convection  of heat. at the consumption edges of the plate, the material has thermally contracted to become dense, and it sinks under its own weight in the process of  subduction  usually at an  ocean trench.[3]this subducted material sinks through the earth's interior. some subducted material appears to reach the lower mantle,[4]  while in other regions, this material is impeded from sinking further, possibly due to a phase transition from  spinel  to  silicate perovskiteand  magnesiowustite, an  endothermic reaction.[5]the subducted oceanic crust triggers  volcanism, although the basic mechanisms are varied. volcanism may occur due to processes that add buoyancy to partially melted mantle causing an upward flow due to a decrease in density of the partial melt.secondary forms of convection that may result in surface volcanism are postulated to occur as a consequence of intraplate extension[6]  and  mantle plumes.[7]it is because the mantle can convect that the  tectonic plates  are able to move around the earth's surface.[8]mantle convection seems to have been much more active during the  hadean  period, resulting in gravitational sorting of heavier molten  iron, and  nickel  elements and  sulphides  in the core, and lighter  silicate minerals  in the  mantle.

Ithink b hope that

This bacteria must be very strong as it has a large amount on antibiotic targeting it. this bacteria could be one of many different types and it is very hard to tell which one with out more information.