The hindbrain includes the
a. thalamus.
b. pineal gland.
c. cerebellum.
d. medulla.
e. cerebellum and medulla.
E
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A patient visits a doctor complaining of a stomach infection. The patient insists that he be prescribed enough antibiotics to kill all of the bacteria in his intestines. Why is this a bad idea? (Select all correct choices.)
A. It's notâ€"any bacteria in his intestines will cause the patient to be sick. B. Such an antibiotic treatment could result in a serious C. difficile infection. C. Many intestinal bacteria are beneficial (they provide vitamins or break down cellulose).
Why have gene families evolved? Choose the most accurate answer for gene families in general
A) Although in some cases researchers have inferred that gene families are adaptive, gene families may also evolve due to genetic drift. B) Having multiple copies of a gene can increase transcription and translation of the gene, so when increased transcription is adaptive, then natural selection favors genes duplicating into gene families. C) Gene families are adaptive because each gene can produce a slightly different protein, which allows for diverse functions that are favored by natural selection. D) Gene families evolve because of the activity of mobile genetic elements, which cause repeated gene duplication events.
Chemoautotrophs oxidize which of the following to obtain the energy necessary to reduce carbon dioxide to an organic compound?
A. ammonia B. hydrogen sulfide C. hydrogen gas D. nitrites E. All of the above.
The nitrogenous base that is only found in DNA and not in RNA is:
A. adenine. B. cytosine. C. uracil. D. guanine. E. thymine.