NEET BIOLOGY

Detailed explanation-1: -Human nerve cells differ from human muscle cells because different sets of genes are expressed; in each type of cell, different genes are transcribed into mRNA and translated into protein.

Detailed explanation-2: -In fact, there is a common set of genes to which they can both bind, but differences between their DNA-binding regions allow each of the two proteins to also turn on their own unique sets of genes, which is what enables one to make muscle cells while the other makes neurons.

Detailed explanation-3: -The correct answer is D. Muscle cells and nerve cells in one species of animal owe their differences in structure to differential gene expression. This is because these two cell types have exactly the same genes and the same types of ribosomes but they each express a different subset of these genes.

Detailed explanation-4: -The genetic codes determine the variation in the amino acid sequences. The difference between the muscle and nerve cells is due to the difference in gene expression and not differences in genetic codes.

Detailed explanation-5: -We learned in biology class that every cell in the body has the same DNA. Whether a heart cell, skin cell or muscle cell-they all read from the same genetic blueprint.