After mixing a heat-killed, phosphorescent (light-emitting) strain of bacteria with a living, nonphosphorescent strain, you discover that some of the living cells are now phosphorescent
Which observation(s) would provide the best evidence that the ability to phosphoresce is a heritable trait? A) evidence that DNA was passed from the heat-killed strain to the living strain
B) evidence that protein passed from the heat-killed strain to the living strain
C) especially bright phosphorescence in the living strain
D) phosphorescence in descendants of the living cells
D
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Prolactin stimulates mammary gland growth and development in mammals and regulates salt and water balance in freshwater fish Many scientists think that this wide range of functions indicates that prolactin _____
A) is a nonspecific hormone B) has a unique mechanism for eliciting its effects C) is an evolutionarily conserved hormone D) is derived from two separate sources E) interacts with many different receptor molecules
Imagine that a researcher has discovered a 500 million-year-old leaf fossil from the Cambrian Period. He notices that the leaf had very few stomata compared to present-day leaves
What does this tell the researcher about atmospheric CO2 levels during the Cambrian Period? A. Atmospheric CO2 levels were higher during the Cambrian Period compared to today. B. Atmospheric CO2 levels were lower during the Cambrian Period compared to today. C. Atmospheric CO2 levels during the Cambrian Period were equal to present-day levels. D. Nothing, as CO2 was not part of Earth's atmosphere during the Cambrian Period.
How would a large chromosomal inversion affect the expression of a gene if the gene is located between the two break points but no breaks occur within the gene?
A. The gene would not be transcribed because it would be oriented in the wrong direction. B. The gene would be transcribed normally, but the mRNA would be translated in the 3' to 5' direction. C. The gene would be transcribed in the 3' to 5' direction. D. The inversion would probably have no effect on gene expression.
All of the following areas are subject to intertriginous infections, except
A. behind the knees. B. in the armpit. C. under breasts. D. between folds of the groin. E. chest.