Describe Knudson's two-mutation model: When and where are the mutations posited to occur?
What will be an ideal response?
In Knudson's model, one mutation is inherited and the second occurs in a somatic cell. The inherited mutation would be found in all cells, requiring only one more mutation in one of them to lead to cancer.
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Viroids are naked (lacking a protein shell) pieces of DNA that infect plants
Indicate whether this statement is true or false.
Which of the following pHs has the highest
concentration of hydrogen ions?
a. 1 b. 3 c. 5 d. 7 e. 9
RNA viruses can use their RNA to produce DNA
because they carry __________ enzymes. a. reverse transcriptase b. restriction c. endonuclease d. polymerase e. ligase
Salt marshes differ from estuaries in that the freshwater input in salt marshes is from a single source.
Answer the following statement true (T) or false (F)