What hormone regulates the metamorphosis of tadpoles into frogs?

A. Melatonin
B. Cortisol
C. Estrogen
D. Somatotropin
E. Thyroid hormone


Answer: E

Biology & Microbiology

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Which physical feature makes it possible for amniotes to be completely terrestrial?

a. their skin b. their lungs c. their eggs d. their four limbs e. their brains

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Which element is being studied for use in fuel cells to power cars?

a. iron b. hydrogen c. oxygen d. nitrogen e. uranium

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Which of these is a type of posttranscriptional regulation of gene expression?

A) inactivation of tRNA B) alteration of DNA nucleotide sequences C) breakdown of proteins D) binding of transcription factors to enhancers

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Ammonia (NH3) is converted to nitrite (--NO2) by 

A. decomposers. B. nitrogen-fixing bacteria. C. nitrifying bacteria. D. denitrifying bacteria.

Biology & Microbiology