In humans, xeroderma pigmentosum is a disorder of the nucleotide excision repair mechanism. These individuals are unable to repair DNA damage caused by ultraviolet light. Which of the following are the most prominent types of DNA lesions in individuals su

A) mismatch errors
B) telomere shortening
C) methylation of purines
D) thymine dimers


Answer: D

Biology & Microbiology

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Franklin’s work with three-dimensional models was

similar to that of a. Pauling’s. b. Watson and Crick’s. c. Wilkins’. d. Chargaff’s. e. all of these.

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The pre-digestive organ listed above “C” is called

the a. mouth. b. crop. c. gizzard. d. secreting portion of stomach. e. cloaca.

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A potent neurotoxin that causes paralytic shellfish poisoning in coastal temperate North America is produced by ________.

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