Hyperthyroidism treatment in cats usually involves antithyroid medication or the use of radioactive iodine to destroy the abnormal (overactive) tissue growing in the thyroid gland. Surgery to remove the abnormal tissue is generally not advised, as the

surgery could also accidentally destroy parathyroid tissue. The parathyroid gland releases a hormone called PTH that increases blood calcium levels. Based on your knowledge of homeostasis, predict why surgery is ill-advised.

A) Blood calcium levels would reach abnormally low levels if there is a lack of PTH.
B) Blood calcium levels would reach abnormally high levels if there is a lack of PTH.
C) Positive feedback will not be able to compensate for any problems caused by negative feedback.
D) A lack of PTH disrupts positive feedback control of blood calcium levels.


Answer: A

Biology & Microbiology

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Though reptiles are generally described as tetrapods, some are limbless like the garter snake shown in this photo. Under which order are the limbless reptiles, as well as the lizards, classified?


a. Spenodontia
b. Crocodilia
c. Squamata
d. Testudines

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All of the following could find a location in or on human body tissues suitable for growth except ________.

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Using hair as the derived trait, which does not

fit the clade? a. whale b. crocodile c. wolf d. elephant e. tiger

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Which of the following is the name of the three-base sequence in the mRNA that binds to a tRNA molecule?

A) P site B) codon C) anticodon D) CCA binding site

Biology & Microbiology