Evolution acts at the level of the
A. species.
B. community.
C. ecosystem.
D. population.
Answer: D
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Which bases are most susceptible to hydrolysis of the glycosidic linkage that connects them to the DNA backbone?
A. adenine and guanine B. adenine and thymine C. cytosine and guanine D. cytosine and adenine E. cytosine, thymine, and uracil
You can be outside on an day where the air temperature is 85oF for hours without getting cold. However, you will get cold in 85oF water before too long unless you are very active. This difference is due to
A. higher heat radiation in water relative to air. B. higher heat conduction in water relative to air. C. higher heat convection in water relative to air. D. higher heat evaporation in water relative to air. E. higher heat transpiration in water relative to air.
Which area of the cerebral cortex is important for the formulation of thoughts into speech?
A. Broca's area B. the pons C. the medulla oblongata D. Wernicke's area E. the cerebellum
Reproductive cloning of human embryos is generally considered unethical. However, on the subject of therapeutic cloning there is a wider divergence of opinion. Which of the following is a likely explanation?
A) The use of adult stem cells is likely to produce more cell types than the use of embryonic stem cells. B) Cloning to produce embryonic stem cells may lead to great medical benefits for many. C) Cloning to produce stem cells relies on a different initial procedure than reproductive cloning. D) A clone that lives until the blastocyst stage does not yet have human DNA.