Which cells are very sensitive to calcium levels in the blood?
A) muscle cells
B) red blood cells
C) cartilage cells
D) fibroblasts
E) epithelial cells
A) muscle cells
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Which of the following statements is true of metaphase I of meiosis I?
A) Joined homologous pair uniformly line up on the equatorial spindle with chromosome one at the top and chromosome 23 on the bottom. B) Tetrads align randomly on the spindle equator with all the maternal homologs on one side and all the paternal homologs on the opposite side. C) Homologous pairs align randomly on the spindle equator with a mix of paternal and maternal homologs destined for each of the daughter cells. D) The sister chromatids line up randomly on the spindle equator with some maternal and paternal chromatids on both sides of the equator.
Identify the most common lethal inherited disease affecting Caucasians of Northern European descent that results from a defective gene located on chromosome 7.
A) asthma B) emphysema C) pneumothorax D) pneumonia E) cystic fibrosis
When a muscle atrophies, its muscle fibers
a. split lengthwise b. decreases in mass and becomes weaker c. increase in diameter d. undergo mitotic cell division e. dissolve and are replaced by fibrous scar tissue
Erythrocytes transport oxygen and ________.
A. defend the body against pathogens B. transport nutrients C. regulate erythropoiesis D. transport some carbon dioxide E. initiate blood clotting