In eukaryotes, control of gene expression is not by:. a. translational control in cytoplasm after mRNA leaves the nucleus and before protein is produced.
b. transcriptional control in the nucleus based on which genes are transcribed and how fast they are transcribed.
c. posttranscriptional control in the nucleus after DNA is transcribed, including the speed with which mRNA leaves the nucleus.
d. posttranslational control in the cytoplasm that occurs after protein synthesis. e. the use of repressor proteins and operators.

Imagine you are a student in alfred hershey and martha chase's lab in the late 1940's. you are given five test tubes with the e. coli bacteria that were infected with t2 bacteriophage that have been labeled with 32p or 35s. unfortunately, you forgot to label the tubes and are now uncertain which were 32p labeled and which were 35s labeled. you place the contents of each tube in a blender and pulse it for a few seconds to shear off the protein coats from the bacterial outer membranes. you then centrifuge the contents to seperate the protein coats and the bacterial cells. you then check for radioactivity and obtain the results shown below. which tubes contained e. coli infected with the phage labeled with 32p? select all tubes that apply.