Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The genome size, and the number of genes it encodes varies widely between organisms. The smallest genomes occur in viruses (which can have as few as 2 protein-coding genes), and viroids (which act as a single non-coding RNA gene). Conversely, plants can have extremely large genomes, with rice containing >46,000 protein-coding genes. The total number of protein-coding genes (the Earth's proteome) is estimated to be 5 million sequences.
What is the smallest number of protein coding genes that a virus can have?
A: 2

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Knots do not necessarily influence the stiffness of structural timber, this will depend on the size and location. Stiffness and elastic strength are more dependent upon the sound wood than upon localized defects. The breaking strength is very susceptible to defects. Sound knots do not weaken wood when subject to compression parallel to the grain.
What is wood's breaking strength susceptible to? 
A: defects

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The world's first commercial broadcast automation audio compression system was developed by Oscar Bonello, an engineering professor at the University of Buenos Aires. In 1983, using the psychoacoustic principle of the masking of critical bands first published in 1967, he started developing a practical application based on the recently developed IBM PC computer, and the broadcast automation system was launched in 1987 under the name Audicom. Twenty years later, almost all the radio stations in the world were using similar technology manufactured by a number of companies.
What was launched in 1987 under the name Audicom?
A: broadcast automation system

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Mutual exchange and sharing of resources (i.e., meat gained from hunting) are important in the economic systems of hunter-gatherer societies. Therefore, these societies can be described as based on a "gift economy."
What societies can be described as a "hoarding economy"?
A:
unanswerable