When a bird is exposed to the songs of potential rivals of its own species certain genes are turned off
within neurons in the song-controlling nuclei of the bird’s brain.
Indicate whether the statement is true or false.
ANS: F, turned on
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The observation that atmospheric CO2 levels were typically low during glacial periods in Earth's history is an example of _________________
A. causation B. correlation C. communication
Some compounds are themselves not carcinogens, but their metabolic activity on the compound produces intermediates that are carcinogenic. This process is known as
A) precarcinogenesis. B) carcinogen activation. C) metabolic carcinogenesis. D) plasminogen activation. E) DNA mutagenesis.
A woman visits her doctor's office complaining of pattern baldness. Her mother and father do not have pattern baldness, but her brother does. The doctor is concerned that she may have the serious condition of __, and he immediately orders blood tests to check her ________ levels.
A. tumor of the adrenal gland, 5-dihydrotestosterone B. tumor of the reproductive system, testosterone C. skin cancer, 2,5 alpha-reductase D. tumor of the adrenal gland, estradiol E. tumor of the reproductive system, 5-dihydrotestosterone
Which statement describes a similarity between the diploid and haploid phases of plant life?
a. both end in fertilization b. both are multicellular c. both are immediately followed by meiosis d. both contain sporophytes e. both contain spores