Question

Cell differentiation is the process by which cells become specialized and take on specific roles in an organism. Nearly all cell types in a multicellular organisms contain the same DNA, yet they express their genes differently. Gene expression describes the way in which genetic information is put into action and influences how cells differentiate. What do you know about cell differentiation in multicellular organisms? Check all of the statements that are true. Proteins play a key role in cell differentiation. The external environment, specifically temperature, during the development of turtles and some other reptiles helps to determine the sex of hatching offspring Different transcription factors are associated with the differentiation 
of stem cells into bone, muscle, 
and nerve cells. Transcription factors bind to regulatory regions of a gene and affect their expression. The amount of available light or daylength helps to determine the 
patterns of gene expression 
that lead to flowering in some plants.

Answer 1

I believe all of these answers are correct. Proteins play a key role in cell differentiation. The external environment, specifically temperature, during the development of turtles and some other reptiles helps to determine the sex of hatching offspring Different transcription factors are associated with the differentiation 
of stem cells into bone, muscle, 
and nerve cells. Transcription factors bind to regulatory regions of a gene and affect their expression. The amount of available light or day length helps to determine the 
patterns of gene expression 
that lead to flowering in some plants.

Answer 2

Answer:

"All the answers are correct"

Explanation:

"Proteins play a key role in cell differentiation" - Cell differentiation is the process by which the same cell type undergoes cell division and eventually become cells with different morphology, function and structure. Proteins play a key role in this process, since the differences among cells are the result of the expression of different and specific proteins.

"The external environment, specifically temperature, during the development of turtles and some other reptiles helps to determine the sex of hatching offspring" - This phenomenon is called temperature-dependent sex determination (TSD). For instance, researchers had found that if turtle's eggs incubate below 81.86 Fahrenheit, they will be male. However, if they are incubated above 87.8° Fahrenheit , the hatchlings will be female.

"Different transcription factors are associated with the differentiation  of stem cells into bone, muscle,  and nerve cells" - Transcription factors are essential for cell differentiation. Runx2 regulates cell differentiation into bones, TEAD1-4 regulates muscle differentiation and MEF2A regulates neuronal differentiation.

"Transcription factors bind to regulatory regions of a gene and affect their expression" - Transcription factors function by binding to promoters or enhancers, specific regulatory regions of a gene that serve to control the transcription or expression of target genes.

"The amount of available light or daylength helps to determine the  patterns of gene expression  that lead to flowering in some plants" - This phenomenon is known as photoperiodism, at which the patterns of gene expression that lead to flowering and other developmental processes are regulated in response to day length.