Which of the following is NOT a function of cellular junctions?
A. Cellular junctions hold adjacent cells together.
B. Cellular junctions prevent leakage of materials between cell layers.
C. Cellular junctions permit the direct exchange of small molecules between cytosol of adjacent cells.
D. Cellular junctions bond cells to their ECM.
E. Cellular junctions promote the motility of adjacent cells.
E. Cellular junctions promote the motility of adjacent cells.
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The functional unit of a muscle cell is:
A. a muscle fiber B. the sarcomere C. myosin D. actin
Which of the following statements is true in DNA replication?
A) DNA polymerase unwinds the DNA at replication forks. B) Primase removes short RNA primers and replaces them with DNA. C) Ligase breaks the hydrogen bonds between complementary DNA strands. D) DNA polymerase proofreads DNA, correcting mismatched nucleotides.
Which organelles are visible with the light microscope?
a. nucleus b. nucleolus c. vacuole d. all of the above
Identify two sexually transmitted diseases, listing the symptoms, effects, and treatments for each. What will be an ideal response?