1. Which one of the following was used to determine the structure of the DNA molecule?( )
a. Transmission electron microscope b. Scanning electron microscope
c. Differential centrifugatioin d. X-ray crystallography
e. None of the above
2. You stain membrane proteins with a fluorescent-labeled antibody and notice the membrane is evenly stained. After a few hours, all of the fluorescence is at one end of a cell. You can conclude that( ).
a. Lipids flip-flop in the membrane. b. Proteins move laterally in the membrane.
c. The fluorescent dye was bleached. d. Proteins act as transporters.
e. All of the above
3. You have a preparation of ghosts and need to collect only the right-side out ghosts. You decide you can trap the right-side out ghosts in an affinity column packed with( )
a. SDS. b. A carbohydrate-binding molecule.
c. A protein-binding antibody. d. A serine-binding molecule.
e. None of the above
4. All of the following individuals contributed to cell theory except( )
a. Robert Hooke. b. Matthias Schleiden.
c. Theodor Schwann. d. Rudolf Virchow.
5. The addition of a peptide with an RGD sequence would probably ? the binding of cultured cells to a fibronectin coated dish.( )
a. enhance b. inhibit
c. have no effect on d. none of the above
发表于 2017-8-6 14:05:16