Question

Which of the following statements is(are) true? (Check all that apply)

		glp-1 and lin-12 are partially redundant
		inductive signaling involves signaling between two equivalent cells with the same developmental potentials
		lin-12 primarily functions in vulval development, whereas glp-1 primarily functions in germline development
		lag-2 encodes a transmembrane protein

In eukaryotes, multiple genes can be expressed simultaneously by

	a.	the binding of a mediator complex to several genes at once.
	b.	a repressor protein binding to multiple operators.
	c.	the binding of a specific transcriptional regulator to several genes.
	d.	the arrangement of multiple genes into an operon.

A transcriptional regulator that activates expression of additional transcriptional regulators that induce production of a particular cell type or organ is called a

	a.	master regulator.
	b.	feedback activator.
	c.	reprogramming regulator.
	d.	terminal differentiator.

he control of a gene product’s levels or activity after transcription has taken place is called

	a.	post-transcriptional control.
	b.	combinatorial control.
	c.	epigenetic inheritance.
	d.	cell memory.

Answer 1

Which of the following statements is(are) true? (Check all that apply)

Answer:

glp-1 and lin-12 are partially redundant

lin-12 primarily functions in vulval development, whereas glp-1 primarily functions in germline development

lag-2 encodes a transmembrane protein

Both the lin-12 and glp-1 proteins play role as a receptors in specific developmental cell interactions and they are found to be  partially redundant. Double mutant of these gene show embryonic defects which is not found in either of the single mutant.

Lag-2 encodes the 402 aminoacid transmembrane protein, it is also shown that the extracellular region of lag-2 is similar to amino-terminal regions of Delta and Serrate, might function as Notch receptors.

Inductive signaling refers to the cell signalling between cells of different ancestry and developmental potential leads developmental change in the other.

In eukaryotes, multiple genes can be expressed simultaneously by

Answer:The binding of a specific transcriptional regulator to several genes.

The transcription of multiple genes can be controlled by single regulatory proteins simultaneously because of the existence of  multiple copies of the regulatory protein binding sites within the genome of a cell. They play different role in different gene by which cells can coordinate the regulation.

Mediator complex binds to TF activator. It is evident that different TF can bind to different mediator subunit and mediate at the same time. Operons are found only in prokaryotes but not in eukaryotes.

A transcriptional regulator that activates expression of additional transcriptional regulators that induce production of a particular cell type or organ is called a

Answer: Master regulator

Master regulator are substance which can regulate the other gene. It encodes a factor which is capable of regulating expression of another downstream gene.

Activators are transcription factors that can boost a gene's transcription.

The control of a gene product’s levels or activity after transcription has taken place is called

Answer: Post translational modification PTM

PTM is the RNA level control of gene expression. It occurs between the transcription and translation of the gene. It is very crucial for gene expression regulation

When a relatively small numbers of transcription factors able to control the expression of larger number of genes is called combinatorial gene regulation.

The process of transmission of epigenetic markers from one organism to next generation which brings change in the traits without alteration of the primary structure of DNA is called epigenetic inheritence. Cell memory is the hypothesis that says that memories can be store outside the brain cells.