How can freeze-fracture be used to determine the orientation of a protein in a membrane?
A. Freeze-fracture cuts the membrane in protein-sized components for viewing under an electron microscope.
B. Freeze-fracture allows a cell to be cleaved in such a way as to preserve the embedded proteins.
C. Freeze-fracture allows a cell to be cleaved in between the lipid bilayer, splitting the plasma membrane into two layers.
Answer: C
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Which of the following components is NOT
essential for DNA cloning?
a. plasmids b. ligases c. helicases d. DNA fragments e. restriction enzymes
Chromosomes other than those involved in sex determination are known as
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