1.5 The Origin of Cells

Multiple Choice

Pasteur carried out a series of experiments that provided strong evidence against a widely supported theory. What was this theory?

• Endosymbiosis

• Spontaneous Generation

• Conservative Replication

• Evolution

Multiple Choice

The statement relates to Pasteur's Experiments: "In this experiments, Louis Pasteur demonstrated that if broth was boiled to fill all organisms and was then kept in swan-necked flasks, preventing the entry of organisms, no organisms grew in the broth. If the swan-necked flask was broken, mold soon started to grow". What did this statement suggest?

• Mold evolved by endosymbiosis

• Oxygen is required for anaerobic respiration

• Cells can only be formed by division of pre-existing cells.

• Nutrients are a requirement for mold growth.

Multiple Choice

What is evidence for the endosymbiotic theory?

• RNA can catalyse metabolic reactions.

• Meteorites contain organic molecules.

• Amino acids can be synthesized from inorganic compounds.

• Mitochondria possess their own DNA.

Multiple Choice

How do both mitochondria and chloroplasts provide evidence for endosymbiotic theory?

• They have double membranes.

• They have 80S ribosomes similar to prokaryotes.

• They contain the same DNA as the nucleus of the cell.

• They exist together in eukaryote cells for their mutual benefit.