Describe the molecular nature of mutation, as related to cancer, in a ras gene
What will be an ideal response?
The ras gene family encodes a protein of 189 amino acids, which is involved with signal transduction in the cell membrane. Point mutations may cause changes in function to allow signals to enter the cell abnormally, thus stimulating uncontrolled cell growth.
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Which type of phage always lyses its host cell?
A. Temperate B. Lysogenic C. Virulent D. Prophage
Choose the letter of the best match from the following:A. Abscisic acidB. TrichomesC. AquaporinD. EndodermisE. StomaTriggers K+ to pass rapidly out of guard cells.
Fill in the blank(s) with the appropriate word(s).
Globally, what is the greatest killer of species?
a. destruction of coral reefs b. air pollution c. deforestation d. water pollution e. nuclear contamination
Many cases of pediatric thyroid cancer occurred after the 1986 Chernobyl nuclear accident in Ukraine and the cause was traced to milk containing iodine-131
Which of these might be the most effective method to prevent thyroid cancer increase following exposure to excessive radiation? A) Do not allow anyone to drink any milk. B) Give dairy cows large doses of iodine. C) Give humans large doses of iodine before exposure. D) Give people large doses of iodine a few days following exposure.