Xeroderma pigmentosum (XP) is a rare autosomal recessive disorder. Patients with XP exhibit a cellular hypersensitivity to ultraviolet (UV) radiation, a high incidence of skin cancer and premature aging. Based on these clinical characteristics, what is the most likely cause for this disease?

A. lack of telomerase activity
B. defects in DNA replication
C. defects in DNA repair
D. shortened telomeres


Answer: C

Biology & Microbiology

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What will be an ideal response?

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Which of the following is mismatched?

a. cytokinin; inhibits lateral root formation b. auxin; promotes cell elongation c. gibberellin; involved in phototropism and gravitropism d. abscisic acid; promotes stomatal closure e. ethylene; promotes leaf abscission

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Muscle fibers that are diagonal to the long axis of the body.

a) frontal b) sagittal c) transverse d) oblique e) midsagittal

Biology & Microbiology

The first day of the monthly menstrual cycle begins with ____

a. menarche b. menopause c. gametogenesis

d. menstruation e. ovulation

Biology & Microbiology