Which of These Observations Gives the Most Support to the Endosymbiotic

question 5

Multiple Choice

Which of these observations gives the most support to the endosymbiotic theory for the origin of eukaryotic cells?

• A) the existence of structural and molecular differences between the plasma membranes of prokaryotes and the internal membranes of mitochondria and chloroplasts
• B) the similarity in size between the cytosolic ribosomes of prokaryotes and the ribosomes within mitochondria and chloroplasts
• C) the size disparity between most prokaryotic cells and most eukaryotic cells
• D) the observation that some eukaryotic cells lack mitochondria

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Definitions:

Alkane

A saturated hydrocarbon with single bonds only, having the general molecular formula CnH2n+2, where n is the number of carbon atoms.

Molecular Formula

A notation showing the types and numbers of atoms in a molecule, without indicating their arrangement.

Ethyl

A functional group or moiety consisting of two carbon atoms and five hydrogen atoms (–C2H5), often derived from ethanol.

Dimethyldodecane

An organic compound structured as a dodecane backbone with two methyl groups attached, used in various chemical contexts.