The different types of cells in a body contain identical sets of dna molecules. however, the structures and functions of the cell types vary widely. gene expression describes the way in which genetic information is put into action in undifferentiated stem cells, making some cells, skin cells and others, muscle fibers. dna is first transcribed into mrna. the codons on the mrna specify the order in which amino acids are placed to form a protein. proteins, then play an important role in expressing an organism's physical traits. which of these factors does not play a significant role in cell differentiation? a) transcription factors bind to regulatory regions of a gene and affect their expression by turning genes off or on. b) certain segments of dna will be lost in the translation process, rendering certain genes obsolete in particular cells. c) certain genes can be turned on or off by the presence of concentration of transcription factors in the cytoplasm of the cell. d) the type and amount of rna may determine how a cell differentiates. the process of rna interference can even shut down targeted genes, affecting cell differentiation.

Option B

Explanation:

In cell differentiation, the objective is to differentiate cell on the basis of their functions and organs they are going to form. In this exercise, the cells need to get on an off to define the type of the cell and their function. Hence option A, C is important for cell differentiation. Information from DNA is transferred to mRNA for cell differentiation; hence option D is also correct. While option B has no role in cell differentiation, in fact loss of DNA segment could cause mutation i.e deletion.

Hence, option B is the correct answer

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

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lysogenic     viral dna merges with host cell dna

lysogenic     no symptoms

lytic               viral dna takes over

lysogenic     virus does not destroy host cell

lytic               virus destroys host cell

lytic               induces symptoms of viral infection

lysogenic       cell reproduces and spreads provirus