IB Biology 1.5 Exam Questions & Answers.
Endosymbiotic theory - CORRECT ANSWER a theory that some eukaryotic organelles, such as mitochondria and chloroplasts, originated as free-living prokaryotes that invaded primitive eukaryotic cells. Allowed growth of smaller cells in a cytoplasm, through...
Endosymbiotic theory - CORRECT ANSWER a theory that some eukaryotic organelles, such as
mitochondria and chloroplasts, originated as free-living prokaryotes that invaded primitive eukaryotic
cells. Allowed growth of smaller cells in a cytoplasm, through endocytosis, and the rapid replication they
could persist indefinitely inside the large cells.
It also states that mitochondria were once free living prokaryotic organisms that had developed the
process of aerobic cell respiration and the previously mentioned process persisted so that mitochondria
are inside the eukaryotic cells today. Organelles that are found in eukaryotic cell indicates that they have
features that they used to exist in their own right.
Genetic code - CORRECT ANSWER a nearly universal sequence of nucleotides in DNA that determines
the specific amino acid sequence in the synthesis of proteins.
Louis Pasteur - CORRECT ANSWER French scientist that proved, among other things, that the emergent
growth of bacteria in nutrient broths is due to biogenesis, not spontaneous generation.
Spontaneous generation - CORRECT ANSWER old theory that believed in the formation of living
organisms from non-living matter.
Sterilization - CORRECT ANSWER technique used for the elimination of microbiological organisms to
achieve a sterile microbial environment.
Evidence from Pasteur experiment refuted idea of spontaneous generation. - CORRECT ANSWER Under
favourable conditions, the broth that was inside the flasks was in contact with air which it had been
suggested was needed for spontaneous generation, yet no spontaneous generation occurred.
It shows that the glass swan necks prevented organisms from air getting into the broth or other liquids
and that no organisms appeared spontaneously.
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