The Synthesis of New DNA Requires the Prior Existence of Oligonucleotides

question 45

Multiple Choice

The synthesis of new DNA requires the prior existence of oligonucleotides to serve as primers. On Earth, these primers are small RNA molecules. This latter observation is evidence in support of the hypothesized existence of

• A) a snowball Earth.
• B) earlier genetic systems than those based on DNA.
• C) the abiotic synthesis of organic monomers.
• D) the delivery of organic matter to Earth by meteors and comets.
• E) the endosymbiotic origin of mitochondria and chloroplasts.

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Definitions:

Cognitive Neuroscience

An interdisciplinary field of research focused on understanding the neurological basis of mental processes and how the brain enables the mind.

MRI

Magnetic Resonance Imaging, a medical imaging technique used in radiology to form pictures of the anatomy and the physiological processes of the body.

Psychiatric Social Workers

Are professionals who provide mental health services focusing on the social aspects of patient care, including counseling, advocacy, and connecting individuals with community resources.

M.D.

An abbreviation for Doctor of Medicine, a degree awarded to physicians following the completion of their medical school education.