Melanoma is a form of skin cancer that arises from melanocytes. Melanoma is most common in Caucasians between 40 and 70 years of age. Explain why Caucasians would have a greater incidence of melanoma.
What will be an ideal response?
Melanoma has its beginnings in melanocytes, the skin pigment cells. These cells produce the dark protective pigment called melanin. It is the melanin that is responsible for suntanned skin acting as a partial protection against the sun. Melanocytes of black- and brown-skinned people produce many more darker melanocytes than those of fair-skinned individuals. Dark brown or black skin is not a guarantee against melanoma, but the incidence is higher in Caucasians.
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If gametes were diploid like somatic cells, how many chromosomes would the zygote contain?
A) Twice the diploid number, and with every succeeding generation, the chromosome number would continue to double and normal development could not occur. B) Half the diploid number with no change in development. C) Triple the diploid number, and with every succeeding generation, the chromosome number would continue to triple and normal development would not occur. D) There is no relationship between gametes and somatic cells.
Which of the following is not a component of seminal fluid?
A. Prostaglandin B. Citric acid C. Mucous D. Seminalplasmin E. Calcium
At which stages does the chromosome number double?
A) prophase B) metaphase C) interphase D) telophase
Helper T cells ________
A) function in the adaptive immune system activation B) often function to decrease the immune response C) bind tightly to target cells and release a lymphotoxin called perforin D) release B7 proteins