Which of the Following Is a Modification of the Simple

question 71

Multiple Choice

Which of the following is a modification of the simple columnar epithelium that allows for efficient absorption along portions of the digestive tract?

• A) fibroblasts
• B) cilia
• C) thin and permeable
• D) dense microvilli

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Definitions:

Operator

A segment of DNA to which a repressor protein binds, regulating the expression of genes by blocking the attachment of RNA polymerase to the promoter region.

RNA Polymerase

An enzyme that synthesizes RNA from a DNA template, essential for the transcription phase of protein synthesis.

Translational Controls

Regulatory mechanisms in gene expression that control the rate and timing of protein synthesis from mRNA.

Ribosomes

Cellular structures where proteins are synthesized, reading mRNA sequences and assembling amino acids into proteins based on genetic instructions.