Answer the following questions true (T) or false (F)
1. A reversion mutation is when a base-substitution mutation is changed back to the original DNA sequence.
2. Many mutagens cause a rate of mutation that promotes the development of cancers; such mutagens are called carcinogens.
3. DNA transposons rely on the enzyme reverse transcriptase to insert a copy of cDNA into a new location in the genome.
1. FALSE
2. TRUE
3. FALSE
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Which of the following is crucial to activation of the adaptive immune response?
A) memory cells B) presentation of MHC (major histocompatibility complex)-antigen complex on a cell surface C) somatic hypermutation D) phagocytosis of antibody-antigen complex by macrophages in the blood (the humoral response)
Decomposers are commonly _____
a. fungi c. plants b. bacteria d. fungi and bacteria
Two alleles of the same gene ________
A) are always different B) are always the same C) can be the same or can be different D) originate from the same parent
Water quality can be tested by detection of (E. coli/Cryptosporidium/norovirus) using the chemical known as MUG.
Fill in the blank(s) with the appropriate word(s).