Origin of Life

The early Earth atmosphere was-

• Hot and Hydrogen rich
• Hot and Oxygen rich
• Cold and Carbon-di-Oxide rich
• Moderately warm and Oxygen rich

According to our current understanding, the earliest known life forms evolved around _______ years ago.

• 4.5 billions
• 3.8 billions
• 3.5 billions
• 2.1 billions

Which of the following suggests the early earth atmospheric condition was suitable for spontaneous generation of many complex biomolecule?

• The Miller-Urey experiment
• Oparin's Bubble theory
• Endosymbiosis theory
• The Theory of Evolution

Biological membranes are usually mainly composed of-

• Glycolipid
• Phospholipid
• Sphingolipid
• Lipoprotein

Which of the following explains the evolution of eukaryotic cells from prokaryotic world?

• The Miller-Urey Experiment
• Oparin's Bubble theory
• Endosymbiosis hypothesis
• The Theory of Evolution

A lower surface area to volume ratio is needed for proper cellular functions. That is why cells are usually very small in size.

• TRUE
• FLASE

The oldest known fossils of multicellular eukaryotes are of small ______ that lived about _____ years ago.

• Fungi; 1.5 billion
• Algae; 1.2 billion
• Algae; 0.5 billion
• none of the above

Key evidences for endosymbiosis hypothesis include- (Check all that apply)

• Chloroplasts and mitochondria divide by binary fission.
• Chloroplasts and mitochondria are the same size as prokaryotic cells.
• Chloroplast and mitochondria have their own DNA.
• Mitochondria and chloroplasts DOES NOT have any ribosomes

The earliest cells were similar to modern day-

• Bacteria
• Archeabacteria
• Algae
• Unicellular Eukaryotes

The first eukaryotic cell evolved around ______ years ago.

• 4.5 billions
• 3.8 billions
• 3.5 billions
• 2.1 billions