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After stinging its victim, the honeybee leaves behind the barbed stinger, poison sac, and muscles that continue to pump venom into the wound. A study compared two methods of removing the stinger left behind: scraping off with a credit card or pinching off with thumb and index finger. A total of 40 stings were induced on volunteers. Twenty were removed with the credit card method, and twenty were removed with the pinching method. The size of the welt left by each sting was measured ten minutes later. All 40 measurements came from two volunteers, every of whom received one treatment ten times on one arm and the other treatment ten times on the other arm.
a. The data were analyzed using a two-sample t-test with a sample size of 20 for each treatment. What is wrong with this approach? verify the problem by name, and describe how it can lead to misleading results.
b. What test would be a better choice for these data?
c. Suggest an improvement in the experimental design.
Which of the following statement is false regarding the method of recombination or crossing-over? A. Crossing-over takes place during prophase I of meiosis B. Recombination
how can you find the coded genes for each piece of DNA?
Explain anterior pituitary gland secretes hormones The anterior pituitary gland secretes hormones that elevate the blood glucose and therefore antagonize the action of glucose
P u l l orum disease (bacillary white diarrhea) This disease is caused by poultry-adapted strain of Salmonella genus- Salmonella Pullorum and considered an important hatc
What are the examples of homeostasis? Regulation of body temperature, control of blood glucose levels, the regulation of salt and water balance are the example of homeostasis
Where does cartilage occur in a joint and what it its function? Cartilage might be found covering the surface of bones where they meet in a movable joint. Cartilage decreases f
Which of the following are bound to hemoglobin when hemoglobin is in the R-state? Choose all that apply. 1. Fe2+ 2. CO2 3. 2,3-bisphosphoglycerate 4. Fe3+ 5. Oxygen
Giant chromosomes
Q Why do protease-supplying cells of the stomach and of the pancreas make only precursors of the active proteolytic enzymes? The stomach and the pancreas make zymogens of the p
The F2 phenotypic ratio from a dihybrid cross with epistasis was 9:3:4. If instead of a dihybrid cross, a double heterozygote was test crossed (crossed to a homozygous recessive in
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