Human beings with the inherited disease xeroderma pigmentosum have serious problems with lesions on their skin and often develop skin cancer with repeated exposure to sunlight
What type of DNA damage is not being recognized in the cells of these individuals?
(a) chemical damage
(b) X-ray irradiation damage
(c) mismatched bases
(d) ultraviolet irradiation damage
(d)
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Which of the following is a possible human genotype that could result from nondisjunction of the sex chromosomes in one of the parental gametes?
A. XXY B. XYY C. XXX D. XO E. All of the answer options are correct.
Fluid entering the distal convoluted tubule:
A. is hyptertonic to the interstitial fluid. B. is hypotonic to the interstitial fluid. C. is isotonic to the interstitial fluid. D. may be hypotonic or isotonic to the interstitial fluid, depending on the length of the loop of Henle. E. may be hypertonic or isotonic to the interstitial fluid, depending on the length of the loop of Henle.
What is the function of the product of the viral gene vpu in human infections of HIV?
What will be an ideal response?
A gymnosperm that produces a long taproot and only two leaves belongs to the genus Gnetum
____________________ Indicate whether the statement is true or false.