What is the goal of comparative genomic studies?
a) to identify homologues in model organisms for genes involved in human disease
b) to study how genomes evolve
c) to identify genes that are important for evolution of a particular species
d) to study genetic variation within a species or a population
e) All of the above are goals of comparative genomic studies.
Ans: e) All of the above are goals of comparative genomic studies.
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The binding of tryptophan to the Trp repressor protein results in:
A. the dissociation of the repressor from the operator sequence. B. a conformational change in the repressor that allows the repressor to bind the operator. C. the recruitment of RNA polymerase. D. an increase in the expression of tryptophan biosynthetic enzymes.
The lac operator site within the lac operon is an example of which of the following?
A. cis-acting element B. para-acting element C. trans-acting element D. inter-acting element E. contra-acting element
Enamel like scales on primitive fish (lungfish and coelocanths)
A) placoid B) ctenoid C) plasmoid D) cosmoid
What is the relationship between operons and transcription units?
a. They are synonymous terms. b. An operon consists of a transcription unit plus associated regulatory DNA sequences. c. A transcription unit consists of an operon plus associated regulatory DNA sequences. d. An operon is composed of multiple transcription units. e. A transcription unit is composed of multiple operons.