Why was the one gene: one enzyme hypothesis changed to one gene: one polypeptide chain?
a. because of the discovery of homomultimeric proteins
b. because of the discovery of heteromultimeric proteins
c. because of the discovery of ribozymes
d. because not all enzymes are proteins
e. because messenger RNA is used as the template for polypeptide synthesis
Ans: b
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Oxygen (O2) makes up about 21% of the Earth's atmosphere. The graph below depicts changes in atmospheric O2 levels measured between the years 1990 and 2008. During what season would you expect oxygen levels to be lowest in a single year?
A. summer B. fall C. winter D. spring
DNA is coiled into a tight spiral and makes up the ____________ that are the genetic material in a cell
a. genes b. amino acids c. enzymes d. nucleus e. chromosomes
Emotional states are the responsibility of the
a. medulla. b. corpus callosum. c. limbic system. d. cerebral cortex. e. cerebellum.
Hormones can be considered
A) inducers. B) repressors. C) transcription regulators. D) translation regulators. E) enzymes.