In the experiment in which Frye and Edidin fused the plasma membranes of a mouse and a human cell, what happened
to the membrane proteins?
a. They formed a bilayer.
b. They formed a spherical structure.
c. They moved laterally across the cell surface.
d. They flip-flopped from one layer to the other.
e. They reacted with cholesterol molecules on the membrane surface.
c
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The first intermediate produced after the entry of
acetyl-CoA into the Krebs cycle is a. pyruvate. b. acetyl-CoA. c. fructose bisphosphate. d. oxaloacetate. e. citrate.
Flowing-water ecosystems often alternate two different but related habitats: the turbulent ________ and the quiet pool
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Which statement is incorrect?
A) Only living things contain nucleic acids, proteins, carbohydrates, and lipids. B) Only living things are composed of cells. C) Only living things can grow. D) Only living things maintain homeostasis.
The human body's first exposure to an antigen generates a primary ________ response
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