Repressors act by blocking the binding of ________ to the operator
A) promoters
B) DNA polymerase
C) the operon
D) RNA polymerase
D
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Pseudoephedrine, based on the chemical structure of ephedrine from the Gnetophyte genus Ephedra was used as a treatment for:
A. cancer B. nasal blockage C. headache D. malaria E. erectile dysfunction
Mendel's postulate of independent assortment is supported by a 1:1:1:1 testcross ratio
Indicate whether the statement is true or false
An operon is defined as:
a. a group of structural genes, with no regulatory sequences. b. regulatory sequences upstream of a structural gene. c. a group of related structural genes, plus their associated regulatory sequences. d. one structural gene plus one regulatory gene. e. a group of unrelated structural genes, plus their associated regulatory sequences.
In modern terminology, diversity is understood to be a result of genetic variation. Sources of variation for evolution include all of the following except
A) mistakes in translation of structural genes. B) mistakes in DNA replication. C) translocations and mistakes in meiosis. D) recombination at fertilization. E) recombination by crossing over in meiosis.