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
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Why are some microorganisms specialized to only certain parts of the body? Describe an example that supports your answer
What will be an ideal response?
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
Muscle fibers that are diagonal to the long axis of the body.
a) frontal b) sagittal c) transverse d) oblique e) midsagittal
The first day of the monthly menstrual cycle begins with ____
a. menarche b. menopause c. gametogenesis
d. menstruation e. ovulation