Diatoms reproduce by binary fission
Indicate whether the statement is true or false
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Rods and cones are located in the ____
a. lens b. cornea c. pupil d. iris e. retina
Nondisjunction is viewed as a major cause of aneuploidy
Indicate whether the statement is true or false
How are some plant viroids and virusoids similar to Tetrahymena group I introns?
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In 1822, the Canadian fur trader Alexis St. Martin was accidentally shot with a musket. The shot entered his left chest, fractured a rib, damaged the lungs, lacerated the diaphragm, perforated the stomach, and finally exited his body. Amazingly he survived, but the hole in his belly never completely healed. This allowed Dr. William Beaumont direct access to his stomach for experiments, and led to his discovery of the importance of stomach acid in digestion. Which body cavities did the musket shot pass through?
A. The shot entered the dorsal cavity and exited through the ventral cavity. B. The shot entered the pericardial cavity and exited through the pleural cavity. C. The shot entered the thoracic cavity and exited through the pleural cavity. D. The shot entered the thoracic cavity and exited through the abdominopelvic cavity.