DNA is synthesized in which stage of the typical cell cycle?
A. prophase
B. G1
C. S
D. G2
C. S
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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 thoracic cavity and exited through the abdominopelvic cavity. C. The shot entered the thoracic cavity and exited through the pleural cavity. D. The shot entered the pericardial cavity and exited through the pleural cavity. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the body cavities? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray?
In humans, taste buds lie mainly in tiny elevations called ____
a. stereocilia b. ommatidia c. ocelli d. papillae e. cilia
How are the structures of RNA and DNA similar?
A. Their sugar-phosphate backbones are formed by phosphodiester linkages. B. Adenine pairs with thymine in both. C. They both have the same tertiary structure. D. They both contain the sugar ribose.
A chemical that does a great deal of biological damage to DNA is:
a) hydroxy ion b) hydrogen ion c) antioxidants d) hydroperoxyl radical