THE MOLECULAR BASIS OF INHERITANCE
DNA MAKES RNA MAKES PROTEIN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The bacteria have stopped growing.
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The radiation has done nothing to the bacterial DNA.
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The plate has become contaminated with bacteria from the air.
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The gene coding for the protein producing yellow coloring has been mutated.
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Detailed explanation-1: -A plate containing yellow colonies of bacteria is exposed to radiation. The next day the colonies are larger; some colonies have yellow centers and white edges. What has happened? Every copy of a particular protein manufactured by a cell shows the same incorrect amino acid at the same point in its structure.
Detailed explanation-2: -What would MOST likely happen if a genetic defect prevented the cell from producing one or more of these enzymes? Replication would stop until more enzyme was produced. Potentially hazardous mutations would accumulate in the cell.
Detailed explanation-3: -As the RNA polymerase approaches the end of the gene being transcribed, it hits a region rich in C and G nucleotides. The RNA transcribed from this region folds back on itself, and the complementary C and G nucleotides bind together. The result is a stable hairpin that causes the polymerase to stall.
Detailed explanation-4: -The nucleoid (meaning nucleus-like) is an irregularly-shaped region within the cell of a prokaryote that contains all or most of the genetic material.
Detailed explanation-5: -Thus, during expression of a protein-coding gene, information flows from DNA