The oxygen revolution facilitated by cyanobacteria had an en

The \"oxygen revolution\" facilitated by cyanobacteria had an enormous impact on life in our planet. As a result, the rising concentration of atmospheric oxygen wiped out the prokaryotic organisms that flourished in the CO2 rich environment: none of these early prokaryotic organisms has survived to present times. True False Kuru is caused by a neurotropic virus that \"homes\" in the brain cells. This virus belongs to the same family of viruses that cause mad cow disease, and it is one of the smallest life forms\" known to science. True False Lipid bilayers can only be synthetized by biological organisms. This is supported by the rise of internal compartmentalization seen in eukaryotic organisms. It is thought that the formation of internal organelles in eukaryotic cells resulted from the invagination of the external cell membrane in prokaryotic cells True False Abiogenesis is the hypothesis that life exists throughout the universe, distributed by meteorites, planetoids and asteroids. The theory of abiogenesis proposes that life in this planet arouse from extremophile bacteria that came from outer space trapped in interstellar debris. True False The basic elements that are the building blocks of life in this planet are only found in living organisms; hence, these are only of biological origin. This contradicts the theory of abiogenesis. True False DNA is the only known source of genetic information/code for biological organisms/systems in this planet. True False the Cretaceous mass extinction is thought to have occurred as a result of a massive meteorite impact near the Yucatan peninsula. The impact crater (recently located) together with the iridium deposits in the days of the planet, supports this hypothesis. True False Reproduction, mutation, use of energy and evolution are characteristics only of living things. True False

Solution

28)

The micro fossils discovered in the rocks more than 3.5 billion years old were the single celled prokaryotic organisms resembling the modern bacteria. These must have evolved in absence of oxygen. Over time, photosynthetic organisms (cyanobacteria) might have evolved increasing the concentration of oxygen in the atmosphere. This has caused some organisms to extinct because they could not tolerate the high oxygen levels and some organisms to develop more effective metabolic pathways to metabolize the oxygen. The statement is true.

29)

Kuru is a neurodegenerative disease caused by abnormally folded protein agents called prions. Mad cow disease or bovine spongiform encephalopathy or mad cow disease is also caused by a misfolded protein agent called prion. The given statement is true.

30)

The prokaryotic cells evolved earlier were started to develop internal membranes some 2 billion years ago, due to which the evolution of eukaryotic cells had took place. The eukaryotic organelles like mitochondria and chloroplast resemble the prokaryotic cells. This has happened due to establishment of symbiotic relationship between prokaryotes that entered the eukaryotic cells. Thus, endosymbiotic theory states that the eukaryotic cells are produced from living communities formed by prokaryotic organisms. The given statement is false.

31)

It is evident the life is not formed spontaneously and this has been known by the proving of spontaneous generation theory as wrong by Louis Pasteur. Life arose from nonlife several billion years ago by the condensation of organic molecules. Still, life can be formed by nonlife by various chemical reactions by which artificial genetic molecules can be synthesized and evolution occurs through life to life forms. The given statement is true.

32)

Building blocks of life include proteins, carbohydrates, lipids and nucleic acids. These are of biological origin and disprove the theory of abiogenesis. The given statement is true.

33)

Deoxyribo nucleic acid or DNA is the source of genetic information passed from one generation to other in the biological systems. The given statement is true.