What fraction of the genome contains genes that are essential for the survival of an organism, meaning that a homozygous null for them is lethal?
What will be an ideal response?
Ans: About 10% of genes appear to be essential. Surprisingly, the fraction of genes essential for survival is similar in bacteria, yeast, worms and flies, although they have different numbers of redundant genes. This fraction may be low because an organism may have genes that are redundant or it may contain redundant pathways that serve the same function.
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Why do scientists hypothesize that RNA was the first form of genetic material?
A. RNA can store genetic information and form membranes. B. RNA can store genetic information. C. RNA can catalyze reactions. D. RNA can catalyze reactions and store genetic information. E. RNA can catalyze reactions and form membranes.
A gene can be silenced by the addition of what to a nucleotide?
a. -CH3 b. -COOH c. -OH d. -NH2 e. -PO4-3
The symplast transports all of the following except
A) sugars. B) mRNA. C) DNA. D) proteins. E) viruses.
What structure is responsible for physically organizing the events of the cell?
What will be an ideal response?