The first catalytic and self-replication biological molecule was most likely
A) RNA.
B) DNA.
C) proteins.
D) ATP.
Answer: A
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Which common crop may contain traces of hormone-like substances that may affect human health?
A. corn B. peanuts C. soybean D. wine grapes E. wheat
As a physician listens to the heart of a human patient, he hears an atypical "lub" sound. Which part of the heart might be malfunctioning?
A. the AV valve B. the semiliunar valves C. the right atrium D. the right ventricle
Normal cells become cancer cells when
A.) regulation of cell growth and division occurs B.) cells respond to control mechanisms C.) cells pass through G1 D.) cells do not respond to checkpoints
The overall three-dimensional shape of a polypeptide is called the _____.
A. double helix B. primary structure C. secondary structure D. tertiary structure E. quaternary structure