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 is not part of the outer ear?
A. oval window B. pinna C. auditory canal D. eardrum
What is the leading cause of age-related blindness in the United States?
a. Macular degeneration b. Glaucoma c. Lack of focus d. Cataract e. Colorblindness
Studies of a soybean plant (Glycine max) and the bacterium Bradyrhizobium japonicum have shown that the tip of a root hair curls toward the bacteria as a response to which of the following?
a. a flavonoid released by soybean roots b. nod gene products produced by soybean roots c. nod gene products produced by the bacterium d. nitrogen fixation by the bacterium
The "pre-adaptations" of early arthropods that allowed them to evolve into terrestrial forms were
A) eggs. B) exoskeletons. C) vertebral columns. D) kidneys. E) lungs.