Question

Gene expression in developing organisms is regulated on several different levels. In many developing animals, regulation of gene expression is influenced by the action of Hox genes. Which of the following regulatory elements is produced by many Hox genes? a) signals from maternal cytoplasm, such as bicoid mRNA b) processing factors c) cell-surface molecules for cell—cell interactions d) transcriptional factors

Answer 1

Regulatory elements produced by many Hox genes is d) transcriptional factors.

Step-by-step explanation:

Gene expression is known as the process by which information from a gene is used to synthesis a functional gene product i.e proteins , but in non-protein-coding genes such as transfer RNA (tRNA) or small nuclear RNA (snRNA) genes, the functional product is a functional RNA. It is the process by which the heritable information in a gene, the sequence of DNA base pairs, is translated into a functional gene product, such as protein or RNA.

Gene expression involves two stages

1.Transcription

2.Translation

Gene regulation most commonly can occur at the level of transcription, controlled by active proteins called transcription factors.Following are the active transcription factors controlling gene expression

The structural genes contain the code for the proteins products that are to be produced. Regulation of protein production is largely achieved by modulating access of RNA polymerase to the structural gene being transcribed.

The promoter gene doesn't encode anything; it is simply a DNA sequence that is initial binding site for RNA polymerase.

The operator gene is also non-coding; it is just a DNA sequence that is the binding site for the repressor.

The regulator gene codes for synthesis of a repressor molecule that binds to the operator and blocks RNA polymerase from transcribing the structural genes.

Answer 2

d) transcriptional factors

Step-by-step explanation:

Gene expression in developing organisms is regulated on several different levels. In many developing animals, regulation of gene expression is influenced by the action of Hox genes. Transcriptional factors regulatory elements is produced by many Hox genes.

Transcription factors are proteins that help turn specific genes "on" or "off" by binding to nearby DNA and Hox genes help lay out the basic body forms of many animals, including humans, flies, and worms. They set up the head-to-tail organization.