You have discovered a new cytoskeletal element and need to identify and characterize it for further work. How would you go about examining this protein to ultimately classify it as a cytoskeletal element?
What will be an ideal response?
Answer: First, isolate the subunit and determine whether it polymerizes and has a protein sequence similar to other known cytoskeletal proteins. Second, determine whether the subunit has structural polarity and structural similarity to other cytoskeletal proteins. Third, determine whether function is affected by a variety of known cytoskeletal protein inhibitors.
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Explain how the internal structure of a cell isolated from the pancreas (a glandular organ that secretes hormones such
as insulin, as well as digestive enzymes) differs from that of a muscle cell.
What will be an ideal response?Fossils
a. are remains of organisms. b. are formed when organic materials are replaced with minerals. c. provide evidence of evolution. d. are all of the above.
Which of the following characteristics is present in all chordates?
A. gills B. notochord C. vertebrae D. All of the above are correct.
All of the following statements regarding stem cells are true, EXCEPT
A. Embryonic stem (ES) cells differentiate into pluripotent cells. B. Pluripotent stem may be reverse-engineered from adult stem cells. C. Totipotent stem cells differentiate into embryonic stem cells. D. Totipotent stem cells may differentiate into placental cells. E. Totipotent stem cells may only be harvested from the blastocyst stage.