Ribozymes may have originally developed by ____

a. ATP synthesis
b. the chance assembly of RNA molecules
c. cellular respiration
d. glycolysis
e. electron transfer systems


ANSWER: b

Biology & Microbiology

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Which of the following types of cells utilize deoxyribonucleic acid (DNA) as their genetic material but do not have their DNA encased within a nuclear envelope?

A) animal B) plant C) archaean D) fungi

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The free energy transferred by two electrons from NADH to O2 through the electron transport chain is _______ kcal/mol.

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