Red-green color blindness is an X-linked recessive trait in humans. A color-blind woman and a man with normal vision have a son. What is the probability that the son is color blind?
A) 75 percent B) 50 percent C) 25 percent D) 0 percent E) 100 percent
Answer: E
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The latent form of a bacteriophage genome that exists when a phage establishes lysogeny is called a ________.
A. lysogen B. viroid C. prophage D. prion
Answer the following statements true (T) or false (F)
1. Most plants transport sucrose over long distances through the xylem. 2. Vessels of the xylem are dead cells and therefore can transport water and minerals upward in the plant. 3. The Casparian strip prevents apoplastic movement through epidermal cells. 4. Plants that grow in salt marshes must have a mechanism for coping with potential osmotic stress in their cells. 5. When plants take up water and minerals these must pass through both a cell wall and a membrane.
During which of these eras were dinosaurs dominant?
A) Mesozoic B) Cenozoic C) Precambrian D) Paleozoic