Alternative splicing has been estimated to occur in more than 95% of multi-exon genes. Which of the following is NOT an evolutionary advantage of alternative splicing?

a) Alternative splicing increases diversity without increasing genome size
b) Different gene isoforms can be expressed in different tissues
c) Alternative splicing creates shorter mRNA transcripts
d) Different gene isoforms can be expressed during different stages of development

The phlogiston theory in the 17th century attempted to explain burning. the theory stated that combustable objects contained a material called phlogiston, a substance without mass, color, odor, etc. after objects burned, the objects were dephlogistonated and were then in their true form. the phlogiston theory was accepted until the 18th century, when lavoisier proved that combustion requires a gas that has mass. phlogiston is considered a) to be scientific knowledge b) not to be scientific knowledge c) to be proven by scientific method d) to be accepted in the modern scientific community

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

Which greenhouse gas is emitted when burn fossil fuels for energy? a.nitrogen b.oxygen c.carbon dioxide d.helium