Which of the following statements about thymine dimers is false?
A) Patients with xeroderma pigmentosum have faulty DNA repair mechanisms.
B) They are repaired by excision repair.
C) They can be produced by exposure to UV light.
D) They are repaired by one enzyme that can clip out, lay down new nucleotides, and seal the gap.
E) If resulting mutations accumulate, it can result in cancers.
Answer: D
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Answer the following statements true (T) or false (F)
1. Friedrich Wöhler refuted the scientific concept of vitalism during the early 1800s by proving that organic molecules could be synthesized outside a living organism. 2. Because carbon and hydrogen share similar electronegativities, they will form nonpolar covalent bonds with each other. 3. Macromolecules such as lipids and carbohydrates are produced from monomers through condensation reactions. 4. The sole function of carbohydrates is to serve as energy stores.
Four of the five fertility control methods listed below
are related by similar effectiveness. Select the exception. a. the Pill b. tubal ligation c. vasectomy d. douching e. IUD
The distribution of phenotypes for human birth weight is a good example of:
a. the founder effect. b. genetic drift. c. directional selection. d. disruptive selection. e. stabilizing selection.
Since all action potentials are identical, the intensity of a sensation depends on:
a. whether a myelinated or unmyelinated neuron has been stimulated. b. the duration of the stimulation. c. whether the neuron stimulated is a pre- or postsynaptic neuron. d. the total number of neurons stimulated and the frequency of their discharge. e. the presence of an EPSP or IPSP, which allows for a graded response.