Which Component in an Operon Acts First in Expression

question 8

Multiple Choice

Which component in an operon acts first in expression?

• A)structural genes - mRNA transcription
• B)promoter - where RNA polymerase first binds to DNA
• C)terminator - last part of a gene
• D)regulatory gene - codes for the repressor protein
• E)operator - if unbound,allows RNA polymerase to bind DNA

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Definitions:

Dominance Effects

Genetic interactions where one allele masks or suppresses the expression of another allele at the same locus.

G × E Interactions

Genetic and Environmental interactions, which describe how genetic makeup and environmental factors influence the phenotype or traits of an organism.

Phenotypic Variation

The observable differences in appearance, physiology, and behavior among individuals of the same species, resulting from genetic and environmental factors.

Genotype

The genetic makeup of an organism, consisting of the alleles that it inherits from its parents, which determines its specific traits.