Question

1. based on current research what is the relationship selenium and risk of developing cancer?

a. Selenium intake providers a significant benefit in preventing the occurrence of skin cancers.

b. Selenium deficiency is unrelated to occurrence of all types of cancer.

c. The use of selenium supplements has not been proven to reduce the risk of cancer occurrence in the general population

d. There is a risk for the development of prostate cancer if selenium intake is above normal limits

2. The predominant form of iodine the body is T3 and is converted by a selenium containing enzyme. T or F

3. The greatest beneficial effect of fluoride on dentition occurs in early adulthhood. T or F

4. There is variability in the molybdenum content of foods due to geographical location. T or F

5. Arsenic, cobalt, nickel and silicon function are essentisl trace elements. T or F

Answer 1

Ans) 1) d. There is a risk for the development of prostate cancer if selenium intake is above normal limits.

Explaination:

- Previous studies have suggested that selenium supplements might help prevent cancer. Newer research shows that selenium is unlikely to lower cancer risk. Taking selenium supplements may increase the risk of certain types of cancer and type 2 diabetes.

2) True

Explaination:

- All three isoforms of the deiodinases are selenium-containing enzymes, thus dietary selenium is essential for T3 production.

3) False

Explaination

- In children under 6 years of age, fluoride becomes incorporated into the development of permanent teeth, making it difficult for acids to demineralize the teeth. Fluoride also helps speed remineralization as well as disrupts acid production in already erupted teeth of both children and adults.

4) true

Explaination:

- A geographical variation was attributed to differences in the molybdenum content of food items consumed by the residents of different geographic location.