A NASA probe returned samples of rocks from the surface of Mars. From these rocks, a prokaryotic organism was isolated and remained viable under conditions similar to that of Mars. The organisms are capable of dividing to replicate themselves. In order to determine whether the DNA replication of these organisms was semiconservative, an experiment using N15/N14 (similar to that of Mendelson and
Stahl) was performed. If the method of DNA replication were conservative, after one generation one would expect to see
A) all of the DNA in the heavy (N15) band.
B) all of the DNA in the light (N14) band.
C) all of the DNA at a point midway between the heavy and light bands.
D) half of the DNA in the light band, the other half in the heavy band.
E) none of the above
D) half of the DNA in the light band, the other half in the heavy band.
You might also like to view...
During protein synthesis in eukaryotes, which molecule passes from the nucleus to the cytoplasm and specifies the sequence of amino acids in the new polypeptide?
A. DNA B. RNA polymerase C. mRNA D. rRNA E. tRNA
Phenotypic sex is determined at the moment of fertilization
a. True b. False
Some members of the alphaproteobacteria produce a structure called a (filament/prostheca/pilus) to produce extra surface area for nutrient absorption
What will be an ideal response?
How are type 1 and type 2 diabetes mellitus similar?
A. The body does not produce insulin in both. B. The number of glucose carriers is too low in both. C. The body does not produce glucagon in both. D. The blood glucose levels are very high in both. E. Both are a result of obesity.