During transcription, RNA polymerase adds new nucleotides

During transcription, RNA polymerase adds new nucleotides

at the carboxy-terminal of the elongating chain
at the amino-terminal of the elongating chain
at the 3` end of the elongating chain
at the 5` end of the elongating chain
at both 5` and 3` ends of the elongating chain

Different cells of an organism can produce different types of proteins because

They have different genes in different cells
Same genes are present in all cells
Differential expression of genes in different cells
Same genes are expressed in all types of cells
None of the above

Expert Solution

A) option C - at 3' end of the chain

RNA polymerase always builds a new RNA strand in the 5’ to 3’ direction. That is, it can only add RNA nucleotides (A, U, C, or G) to the 3' end of the strand.

Different cells of an organism can produce different types of proteins because of - Differential expression of genes in different cells

Most living things are composed of different kinds of cells specialized to perform different functions. A liver cell, for example, does not have the same biochemical duties as a nerve cell. Every cell of an organism has the same set of genetic instructions, but different types of cells have different structures and biochemical functions. Since biochemical function is determined largely by specific enzymes (proteins), different sets of genes must be turned on and off in the various cell types. This is how cells differentiate. This is the process of cell-specific expression of genes.

gladiator answered 2 years ago

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