Answer the following statements true (T) or false (F)
1. The movement of DNA polymerase continues unimpeded if a thymine dimer is present in the DNA double helix.
2. Cells are normally limited to one DNA repair system that corrects DNA mistakes.
3. Patients who suffer from xeroderma pigmentosum (XP) have a defective mismatch repair system.
4. Cancers originate from a single cell.
1. FALSE
2. FALSE
3. FALSE
4. TRUE
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Which of the following involves an increase in entropy?
A) hydrolysis B) reactions that join monomers C) polymerization D) chemical evolution
The apprentice in your horticulture lab accidentally trims all of the axillary buds from a particularly prized specimen. After realizing his mistake, he rather glumly asks you, as lead horticulturalist, about the effects on the plant. You predict that
A. the plant will die rapidly from this loss. B. the plant will regrow the lost buds. C. the plant will continue its vertical growth and will be a tall and skinny variety. D. the plant will continue its horizontal spread and will be a wide but short variety.
A snake with stripes would be more likely to survive by fleeing predators in a straight line.
a. true b. false
Which of the Page 78following is not a function of proteins present in the plasma membrane?
a. Proteins assist the passage of materials into the cell. b. Proteins interact with and recognize other cells. c. Proteins bind with specific hormones. d. Proteins carry out specific metabolic reactions. e. Proteins produce lipid molecules.