Dense, regular tissues that connect bone to bone are called
a. muscles.
b. cartilage.
c. ligaments.
d. tendons.
e. organelles.
C
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The plant hormone that triggers the withering of petals and stamens and promotes fruit ripening is
A. abscisic acid. B. ethylene. C. jasmonic acid. D. cytokinins. E. gibberellins.
The following graph represents the concentration of cyclins over the course of the cell cycle. Which of the following statements is TRUE regarding the phase of the cell cycle where the green arrow is pointing?
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A. At this point in the cycle the cell is continuing to grow and make abundant tubulin proteins. B. At this point in the cell cycle, the cell has determined that the DNA is intact and environmental conditions are favorable for DNA replication. C. At this point in the cell cycle, DNA has already been replicated correctly and the cell is preparing for mitosis. D. At this point in the cycle the cell is determining if environmental conditions are favorable for growth and proliferation. E. At this point in the cell cycle, chromosomes have properly aligned on the metaphase plate and are beginning to separate.
In antigen binding, MHC protein binds to the T cell epitope, whereas the TCR binds the MHC motif
Indicate whether the statement is true or false.
A monomer is covalently joined to a growing polymer chain by
A. a condensation reaction B. removal of an H and an OH from the monomer and the polymer being joined, resulting in formation of a water molecule and the formation of a covalent bond between the monomer and the growing polymer chain C. all of these answers are correct D. a dehydration reaction