On an Item Characteristic Curve,the Point Halfway Between the Lower

question 25

Multiple Choice

On an Item Characteristic Curve,the point halfway between the lower and upper asymptotes is referred to as the __________ and represents the difficulty of the item.

• A)medial apex
• B)modal beta
• C)beta index
• D)inflection point

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Definitions:

Enhancers

Regulatory DNA sequences that enhance gene transcription; can be located long distances away from the actual coding regions of a gene.

Tryptophan Operon

A cluster of genes in bacteria involved in the production of the amino acid tryptophan, regulated by feedback inhibition.

Repressor Gene

A gene that encodes a protein which can bind to an operator or promoter sequences to prevent transcription of a certain gene.

Promoter

A region of DNA that initiates transcription of a particular gene, playing a crucial role in regulating gene expression.