As a researcher, you were asked to grow a cell in a medium containing radioactive nucleotides, which then get incorporated into DNA. Upon later examination, the radioactivity appeared to be concentrated in the:

A-
nucleus.

B-
endoplasmic reticulum.

C-
plasma membrane.

D-
peroxisome.

Nucleus

Explanation:DNA (Deoxyribonucleic acid) is a genetic material and carries the genetic information from one generation next generation. It restores the species identity. The Double helical model of DNA was given by the James Watson and Francis Crick in 1953 based on the Chargoff’s rules and X-ray diffraction data of Wilkins and Franklins. According to them, two polynucleotide chains run twist around each other form right-handed double helix. Each nucleotide made up of a nitrogenous base, deoxyribose sugar, phosphate moiety.

The nucleus is a master control center of the cell and it was first discovered by the Robert Brown. It is a membrane-bound organelle harbor the genetic material called DNA. The integrity of DNA is maintained by the nucleus.When the cells are grown in radioactive nucleotides containing a medium, all the radioactive nucleotides are incorporated into the DNA, which is located in the nucleus so most of the radioactivity concentrated in the nucleus of the cell.

a fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.[1] the age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes exceeds 650 million years.[2] fossil fuels contain high percentages of carbon and include petroleum, coal, and natural gas.[3] other commonly used derivatives include kerosene and propane. fossil fuels range from volatile materials with low carbon to hydrogen ratios like methane, to liquids like petroleum, to nonvolatile materials composed of almost pure carbon, like anthracite coal. methane can be found in hydrocarbon fields either alone, associated with oil, or in the form of methane clathrates.

the theory that fossil fuels formed from the fossilized remains of dead plants by exposure to heat and pressure in the earth's crust over millions of years was first introduced by andreas libavius "in his 1597 alchemia [alchymia]" and later by mikhail lomonosov "as early as 1757 and certainly by 1763".[4] the first use of the term "fossil fuel" was by the german chemist caspar neumann, in english translation in 1759.[5]

in 2017 the world's primary energy sources consisted of petroleum (34%), coal (28%), natural gas (23%), amounting to an 85% share for fossil fuels in primary energy consumption in the world.[6] non-fossil sources in 2006 included nuclear (8.5%), hydroelectric (6.3%), and others (geothermal, solar, tidal, wind, wood, waste) amounting to 0.9%.[7] world energy consumption was growing at about 2.3% per year. in 2015 about 18% of worldwide consumption was from renewable sources.[8]

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b