The Ames test demonstrates that a chemical is
A) carcinogenic.
B) carcinogenic in Salmonella.
C) mutagenic in Salmonella.
D) carcinogenic in humans.
E) mutagenic in humans.
C
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Sites in the genome that are more susceptible to mutations are called:
A. mutation spots. B. hotspots. C. risk factors. D. genes. E. noncoding DNA.
An instrument that magnifies slight differences in the refractive index of cell structures is called a (n) ________ microscope.
A. phase-contrast B. densitometric C. electron D. fluorescence
By one estimation, the gross global ecosystem valuation is approximately ____
a. equivalent to the total carbon dioxide processed by all ecosystems b. equivalent to the total amount of carbon fixed c. $18 billion per year d. $18 trillion per year e. $18 million per year
The human body temperature is relatively constant. Which is a feedback mechanism that helps the human body maintain its normal temperature in a cold environment?
A. Water is released from the skin. B. Muscles shake in small movements. C. The rate of heart beats slows. D. The lungs take in additional air.