Your 81-year old grandfather has been diagnosed with cancer of the thymus. The doctor is urging surgical removal of the cancer, but you and the family are worried about the consequences of removing an entire organ such as the thymus. Which statement is correct?
A. Your grandfather will have a loss of T lymphocytes and will have an immune deficiency.
B. There is nothing to worry about; thymus removal will not affect your grandfather's immune status at his age.
C. Your grandfather would not be able to produce complement proteins necessary for pathogen control and inflammation.
D. Your grandfather would not have sufficient phagocytic cells and would not be able to contain bacterial infections.
Answer: B
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How can fossils provide evidence for macroevolutionary processes, such as the divergence of two species from a common ancestor?
A. by providing a complete record of the history of life B. by exhibiting some features of ancestral organisms and some features of more derived organisms C. by preserving the bones, rather than the soft parts of ancient organisms D. by preserving a large number of organisms present in one place and one time, as is seen in Messel Shale
Identify two adaptations in different living organisms and use natural selection to explain how each may have
logically evolved. What will be an ideal response?
Data were collected from the heterocysts of a nitrogen-fixing cyanobacterium inhabiting equatorial ponds. Study the following graph and choose the most likely explanation for the shape of the curve
A) Enough oxygen (O2 ) enters heterocysts during hours of peak photosynthesis to have a somewhat-inhibitory effect on nitrogen fixation. B) Atmospheric nitrogen (N2 ) levels increase at night because plants are no longer metabolizing this gas, so they are not absorbing this gas through their stomata. C) Heterocyst walls become less permeable to nitrogen (N2 ) influx during darkness. D) The amount of fixed nitrogen that is dissolved in the pond water in which the cyanobacteria are growing peaks at the close of the photosynthetic day (1800 hours).
For which of the following diseases does the "feather test" provide evidence of early infection?
A. tuberculosis B. botulism C. tetanus D. leprosy E. anthrax