Suppose ENZ-1 and ENZ-2 are two different restriction enzymes. If various pieces of DNA from different species are cut with these enzymes (as follows), which would most easily form recombinant molecules?
A) Human DNA cut with ENZ-1 and human DNA cut with ENZ-2
B) Human DNA cut with ENZ-2 and gorilla cut with ENZ-2
C) Bacterial DNA cut with ENZ-1 and bacterial DNA cut with ENZ-2
D) Human DNA cut with ENZ-1 and gorilla DNA cut with ENZ-2
B
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Fossil evidence of animal life dates back
__________ years. a. 125 million b. 350 million c. 570 million d. 900 million e. 1.8 billion
Which of the following is an undesirable
characteristic of the cuticle? a. It restricts the movement of water. b. It is transparent to sunlight. c. It coats the exposed surface of leaf epidermal cells. d. It restricts the movement of carbon dioxide. e. None of these is undesirable.
Which of the following is NOT a hormone?
a. gastrin b. secretin c. mucin d. cholecystokinin e. leptin
In which condition are both alleles expressed in the heterozygous phenotype?
A) complete dominance B) codominance C) pleiotropy D) epistasis