You have taken E. coli strain A which has its own plasmids, and mixed it with E. coli B strain without plasmids. E. coli B cells now have plasmids but, in addition, they also carry some genes from E. coli A strain. What has happened is
A. the cells of E. coli A were Hfr cells.
B. vertical transmission of DNA has occurred.
C. the E. coli B cells have become mutants of the original culture.
D. an example of transformation.
Answer: A
You might also like to view...
Assuming independent assortment for all gene pairs, what is the probability that the following parents, AABbCc à— AaBbCc, will produce an AaBbCc offspring?
A) 1/2 B) 1/16 C) 1/8 D) 3/4 E) 9/16
Red blood cells are bi-concave. Their shape is determined by interior proteins anchored to the membrane termed
A. clathrins. B. phospholipids. C. cytoskeleton. D. spectrins. E. actin filaments.
Which is an example of a micronutrient?
A) arginine B) inorganic phosphorous C) iron D) vitamin B12
Represented by only two living genera, Psilotum and Tmesipteris, ____ resemble the extinct Cooksonia. Having no
true roots or leaves, these seedless vascular plants are essentially forking green stems.
a. mosses b. whisk ferns c. ferns d. club mosses e. horsetails