Biology, 05.07.2021 19:20, srtdklug2005
The concentration of a particular protein X in a normal human cell rises gradually from a low point, immediately after cell division, to a high point, just before cell division, and then drops sharply. The level of its mRNA in the cell remains fairly constant throughout this time. Protein X is required for cell growth and survival, but the drop in its level just before cell division is essential for division to proceed. You have isolated a line of human cells that grow in size in culture but cannot divide, and on analyzing these mutants, you find that levels of X protein do not decrease. Which of the following mutations could explain these results?
a. A mutation that results in the loss of an enzyme that adds a ubiquitin tag to the protein.
b. a mutation in gene X that results in the loss of polyA addition to its mRNA
c. a mutation in gene X that changes the sequence that encodes sites at which ubiquitin can be attached to the protein
d. Both A and C
Answers: 2
Biology, 21.06.2019 20:00, flashpoint0117
Common commercial benefits of microorganisms include synthesis ofa. insulin. b. antibiotics. c. aspirin. d. antibiotics and aspirin. e. antibiotics and insulin.
Answers: 1
Biology, 22.06.2019 09:00, Jerjer3864
What drives the atp synthase reactions that produce atp
Answers: 1
Biology, 22.06.2019 14:20, Blahdjwj108
Which feature would you expect to find in a population in which sexual selection depends on male competition?
Answers: 1
Biology, 22.06.2019 20:00, pinapunapula
Which of the following leukocyte is not correctly matched with its function? lymphocytes: immune response against viral infections eosinophil: bacterial macrophage monocytes: macrophage basophils: inflammation eosinophil: bacterial macrophage
Answers: 2
The concentration of a particular protein X in a normal human cell rises gradually from a low point,...
Mathematics, 10.11.2020 20:30
Chemistry, 10.11.2020 20:30
Mathematics, 10.11.2020 20:30
Mathematics, 10.11.2020 20:30
English, 10.11.2020 20:30
History, 10.11.2020 20:30