The Ames test is used to identify potential carcinogens. A compound tested resulted in a few scattered colonies growing on the media, similar to the control plate with no disk. What does this result imply?
A. The compound in the disk is so toxic that it inhibits almost all growth on the plate.
B. The few colonies that grew are resistant to the compound.
C. The few colonies that grew contain reversion mutations that allow them to grow on media without histidine.
D. The compound in the disk is not mutagenic so there was no increase in the reversion rate.
E. Either the compound in the disk is not mutagenic or the few colonies that grew contain reversion mutations.
E
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Why do we only see Neanderthal input in non-African genomes?
A. Neanderthals never interbred with Homo sapiens in Africa. B. Only mtDNA can be inherited. C. Only Y chromosome DNA can be inherited. D. Neanderthals were adapted to a cold European climate.
Arteries
a. are under greater pressure than veins. b. are thinner than veins. c. carry blood toward the heart. d. have valves to prevent backflow.
The adrenal cortex secretion that controls sodium and water reabsorption by the kidneys is _____.
A. cortisol B. epinephrine C. aldosterone D. norepinephrine E. adrenocorticotropic hormone
Hepatitis C is an acute disease.
Answer the following statement true (T) or false (F)