While the introduction of the mutant synthetase gene restored some of the growth characteristics, this strain still does not gro
w as fast as wild-type E. coli. Which of the statements support this observation? A) The mutant synthetase gene allows histidine tRNA to be charged with asparagine, but sometimes this tRNA could deliver asparagine in the place of histidine to other proteins where the histidine residue was important to the function of the protein and growth.B) The mutant synthetase gene allows histidine tRNA to be charged with asparagine, therefore histidine could not be present in any protein. If the the histidine residue was important to the function of various other proteins growth may not be completely restored.C) The codon for histidine has not changed in the mutant variant, therefore only the mutant variant of the protein is produced resulting in slow growth.D) The normal synthetase that charges histidine tRNA with histidine is still present resulting in the mutant variant of the protein. Not having enough of the normal protein may still limit growth.
Light microscopes can only magnify up to 2000 times the original size. It is difficult to enhance the contrast between cells and their surroundings to see cell structure and movement with a light microscope.
The absence of xylem and phloem the water and food transport is very difficult. If by any way the transport is done through its stem then the water and food will get mixed up which obstructs the process as transport of water is in upward direction.
