In which of the following ways are Chlamydia and viruses the same?
A. Both are best treated with antiviral chemotherapy.
B. Both can remain dormant in the cell nucleus for long periods of time.
C. Both are able to reproduce only within a eukaryotic cell.
D. Both have surface proteins that cannot be recognized by the immune system.
Answer: C
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The reason Darwin sailed aboard the H.M.S. Beagle was because he ____
a. wanted to develop his theory of evolution b. was invited to be the ship's naturalist c. was invited to be the ship's geologist d. was invited to be the captain's dining companion e. was invited to be the captain's personal physician
Which of the following is a correct expression of the Hardy-Weinberg equation?
a. p + q = p2 + q2 b. p2 + 2pq + q2 = 0 c. p2 + pq ? q2 = 1 d. p2 + 2pq + q2 = 1 e. p+q = 0
You buy a bunch of small, round, red radishes at the grocery store; they are on sale because they have been sitting in the produce aisle for a while. When you get home you remove the stems and clean them. With the first bite, you notice their texture is not as crisp and crunchy as you like. Your friend says you should refrigerate them in a bowl of water overnight. The next day the radishes are crisp and crunchy again. What is the most likely explanation of why they became crunchy again after soaking in water?
a. The radish cells were hypertonic to the water in which they were soaking. So, the water moved by osmosis across the plasma membranes into the radish cells increasing the turgor pressure inside of the cells and making them crunchier. b. The radish cells were hypotonic to the water in which they were soaking. So, the water osmosed across the plasma membranes out of the radish cells decreasing the turgor pressure inside of the cells and making them crunchier. c. The radish cells were hypertonic to the water in which they were soaking. So, the water osmosed across the plasma membranes into the radish cells decreasing the turgor pressure inside of the cells. d. The radish cells were hypotonic to the water in which they were soaking. So, the water osmosed across the plasma membranes into the radish cells decreasing the turgor pressure inside of the cells.
Which statement does NOT support the cohesion-tension theory of water transport?
A. Water molecules are strongly cohesive B. The interior surface of a xylem cell is strongly hydrophobic C. Water evaporates from the walls of the mesophyll D. Water molecules are adhesive E. Transpiration allows the escape of water vapor from a plant through stomata in the leaf surface