Explain what is meant by the term heteroduplex in the context of bacterial transformation
What will be an ideal response?
If transforming DNA is derived from a genetically distinct bacterium, incoming DNA may be different from the host DNA. During initial stages of integration into the bacterial chromosome, the recombinant region contains one strand of DNA that may have a different base sequence than the other strand. Because these strands are not genetically identical (complementary), this double-stranded region is called a heteroduplex.
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Geneticists designate heritability as "narrow" or "broad" to account for the fact that
A) genes contribute to different degrees. Typically, recessive alleles are rare and can have a large impact and dominant alleles tend to be common with minor but additive effects. B) genes contribute to different degrees. Typically, dominant alleles are rare and have a small impact and recessive alleles tend to be common, each with major effects. C) genes contribute to different degrees. Typically, dominant alleles are rare and can have a large impact and recessive alleles tend to be common with minor but additive effects. D) dominant and recessive alleles have equal impact, but dominant alleles are more common than recessive alleles.
Caribbean seagrasses are extensively fed on by all except
a. manatees. b. green sea turtles. c. some sea urchins. d. sea cucumbers.
Typical signs of dehydration include.
A) rapid, strong pulse. B) low hematocrit. C) increased urine output. D) dry mucous membranes.
Koch's postulates were used to demonstrate the relationship between
A) HIV and AIDS. B) Mycobacterium leprae and leprosy. C) liver parasites and liver cancer. D) Haemophilus influenzae and meningitis. E) Haemophilus influenzae and the flu.