What is the difference between a gene that is derepressed and one that is induced?
A.
A gene that is derepressed is turned on because a repressor protein is not bound without its cofactor. By comparison, a gene that is induced is turned on because an inducer molecule prevents binding of the repressor.
B.
Genes that are derepressed are turned on because an inducer molecule is present. By comparison, a gene that is induced is turned on because a repressor protein is bound to the operator.
C.
There is no difference between a gene that is derepressed and one that is induced.
D.
A derepressed gene is turned off and an induced gene is activated to be expressed.
A.
A gene that is derepressed is turned on because a repressor protein is not bound without its cofactor. By comparison, a gene that is induced is turned on because an inducer molecule prevents binding of the repressor.
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A testcross involves crossing with a(n) _________ individual and is used to determine the _________ of the tested parent
A. homozygous dominant; phenotype B. homozygous recessive; phenotype C. homozygous dominant; genotype D. homozygous recessive; genotype E. F2 offspring; parental genotype
Generally the proteins of thermophiles
A. resist denaturation. B. react more efficiently with DNA. C. are easily denatured. D. have a particular amino acid sequence that restricts bond formation. E. are easily denatured AND have a particular amino acid sequence that restricts bond formation.
Which of the following statements about predation are true? Check all that apply.
_____ Cycling of predator and prey populations is not commonly observed. _____ Removal of a predator often leads to increased community stability. _____ Animal predation on plants is called herbivory. _____ Predation can induce coevolutionary changes in prey species. _____ Batesian mimicry is not a coevolutionary adaptation to predation.
Which hypothesis, based on the two laws of thermodynamics as applied to cells, would determine if something is a living cell or not?
A) If something uses energy to make itself more organized, then it is alive. B) If something is organized, then it is alive. C) If something moves, then it is alive. D) If something loses heat, then it is alive. E) If something uses energy to move, then it is alive.