Which of the following is the cause of goiter in a patient with hypothyroidism?
a. depressed levels of PTH
b. depressed levels of calcitonin
c. elevated levels of TSH
d. elevated levels of iodine
e. elevated levels of thyroxine
ANSWER: c
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The mutation resulting in sickle-cell disease changes one base pair of DNA so that a codon now codes for a different amino acid so it is an example of a _____
A) nonsense mutation B) frameshift mutation C) silent mutation D) missense mutation
In Arabidopsis plants, about 10% of its genome is devoted to processes tied to which molecule?
A. auxin B. ubiquitin C. rubisco D. phytochrome E. gibberellins
In divergence, one neuron:a
is controlled by several neurons. b. is controlled by several neurotransmitter substances. c. contains several different types of ion channels. d. controls several other neurons. e. contains several different types of receptors.
When examining the following figure, which assumption of the Hardy–Weinberg model is being presented?
a. random mating b. selfing c. migration d. mutation e. selection