Why is the phospholipid bilayer important to cell survival? Select the TWO answers that are correct.
A. It maintains homeostasis by forming an insulating layer around the cell.
B. It separates the cellular environment from the external environment.
C. It blocks small, nonpolar molecules from entering the cell and harming it.
D. It anchors nucleotides together as they form molecules of DNA.
E. It acts as a barrier for some, but not all, molecules on either side of it.
Answer : B, E
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Answer the question using the accompanying graph. Which portion of the graph shows the free energy of the reaction?
a. A b. B c. C
d. W + X e. Y + Z
The organ of the lymphatic system where T cells mature is the
A. spleen. B. thymus. C. tonsil. D. lymph node. E. heart.
When proteins are broken down into their subunits, what happens to the amino group removed from the
amino acids that are not used to rebuild proteins or other molecules?
a. They are formed into acetyl-CoA. b. They are converted into pyruvate. c. They are excreted in theurine. d. They are stored as glycogen in liver. e. They are stored in vacuoles in muscle.
Which of the following is NOT involved in self
versus nonself recognition? a. complement b. MHC markers c. TCRs d. plasma membranes e. HLA