Why is DNA resistant to hydrolysis under alkaline conditions?
A. DNA lacks the 3' hydroxyl on the pentose ring, which would have participated in the hydrolysis.
B. Deoxyribose forms furanose rings without oxygen, which makes the ring more stable.
C. The 2' hydroxyl of the sugar is directly involved in the hydrolysis reaction, and DNA lacks this group.
D. The carbonyl of uracil is directly involved in the hydrolysis reaction and DNA lacks this base.
E. None of these choices is correct.
C
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Which of the following statements is true regarding secondary growth in vascular plants? Select all correct choices
A. Secondary growth depends only on the vascular cambium. B. Secondary growth depends only on the cork cambium. C. Secondary growth depends on both the vascular and cork cambia. D. Secondary growth causes a plant to grow in diameter (not height). E. Secondary growth causes a plant to grow in height (not diameter).
You are a genetic counselor, and a couple comes to you with concerns that if they have a child together, he or she
could have hemophilia. Neither of them has hemophilia, but the woman's biological father did have an X-linked recessive form of hemophilia. How should you advise them?
a. Half of their children will have hemophilia. b. All of their sons and half of their daughters will have hemophilia. c. None of their children will have hemophilia, but all of their daughters will be carriers for hemophilia. d. Each of their sons will have a 50% chance of having hemophilia, and each of their daughters will have a 50% chance of being carriers. e. All of their sons will have hemophilia, and all of their daughters will be carriers.
The main role of the central vacuole in plant cells is to
A) store glycogen for seed growth. B) synthesize and store proteins. C) digest trapped food particles. D) catalyze photorespiration in association with chloroplasts. E) maintain turgor pressure in plant tissue.
Mitochondria originated from proteobacteria.
Answer the following statement true (T) or false (F)