What kind of molecules serve as electron acceptors in cellular respiration?
A) water
B) polar molecules
C) molecules with high potential energy
D) molecules with low potential energy
E) molecules in an excited state
Answer: D
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Which of the following is true about telomeres and immortality?
A. Immortal cell lines lack telomeres. B. Immortal cell lines lack telomerase. C. Reactivation of telomerase in humans will cause them to become immortal. D. Tumor cell lines can be immortal if their telomerase gene is reactivated. E. Immortal cell lines have telomerase activity but cannot form t-loops and don't have protective proteins to prevent recombination repair.
In mitosis, the main difference between plant and animal cells is that
A. plants do not undergo cytokinesis. B. plants produce a cell plate to segregate the daughter nuclei, while animals form a cleavage furrow. C. plants have a central vacuole, while animal cells do not. D. plants produce a cell membrane in cytokinesis, while animals form a cell plate. E. in plants, kinetochore microtubules shorten and draw chromosomes toward the poles; in animals, polar microtubules lengthen to push chromatids apart.
A component of bacteria that are often used in biotechnology are
a. operons. b. introns. c. exons. d. polypeptides. e. plasmids.
You have fused a mouse cell and a human cell and then treated the cell with specific antibodies that are covalently linked to fluorescent dyes (antibodies to mouse proteins - green; antibodies to human proteins - red). What does the cell look like immediately after fusion?
a) the red and green labels are uniformly distributed across the entire membrane b) the cell is half red and half green c) the red and green labels are distributed in intermingled patches d) the cell appears to be brown in color e) the cells appears to be yellow in color