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
Ans: b) the cell is half red and half green
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Which of the following statements about atherosclerosis is false? a. Both high-fat diets and genetics influence the development of the disease
b. A heart attack occurs when a cardiac artery is completely blocked. c. High HDL levels in blood increase risk of atherosclerosis. d. Buildup of lipids in the arterial wall narrows the lumen.
Cuvier, an anatomist and paleontologist, proposed that ____
a. all present-day organisms have descended, with adaptations, from one--or possibly a few--original organisms b. Earth's history has been marked by several periods when destruction of populations was widespread and that, after each such period, the earth was repopulated c. evolutionary changes in organisms are caused by use and disuse d. although evolution is responsible for all the changes that happen to species, one center of creation resulted in the original members of each species e. geologic processes in Earth have not changed over billions of years
In humans, which of these structures is not made of cartilage?
A. Outer ear B. Knee cap C. Intervertebral disks of the backbone D. Larynx E. Tip of the nose
During meiosis, what process can sometimes "unlink" genes?
A) synapsis B) crossing over C) independent assortment D) metaphase II E) the formation of tetrads