Which are important components of the communication between the hypothalamus and anterior pituitary? (Check all that apply.)
_____ ADH and oxytocin
_____capillaries
_____ fibrous pituitary stalk
_____GHIH, PIF, and MIH
_____ hormones
_____hypothalamohypophyseal portal system
_____ transport of hormones down axons
_____ TRH, CRH, GnRH, and GHRH
_____ ADH and oxytocin
__X__ capillaries
_____ fibrous pituitary stalk
__X__ GHIH, PIF, and MIH
__X__ hormones
__X__ hypothalamohypophyseal portal system
_____ transport of hormones down axons
__X__ TRH, CRH, GnRH, and GHRH
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The 13C/12C isotopic ratio of geological rocks of different ages has been used as evidence for or against past biological activity, because compounds of biological origin
A) do NOT contain 13C. B) have a higher proportion of 13C that compounds of geological origin. C) have a lower proportion of 13C that compounds of geological origin. D) are not well preserved in geological samples.
Localized infections by pyogenic bacteria often form boils or abscesses
Indicate whether the statement is true or false.
What is the evidence that human activity is causing increased atmospheric CO2 levels?
A. The isotopic composition of atmospheric CO2 can be measured and shows that CO2 being added to the air now comes from combustion of fossil fuels. B. There is a correlation between the increase of overall CO2 levels and human activity since the Industrial Revolution. C. There is no direct evidence; CO2 levels fluctuate naturally and it may just be coincidence that higher CO2 levels correspond to this period of human activity. D. There is no direct evidence; it is impossible to know what CO2 levels were like in the past, so there is no standard for comparison. E. Since forests are being cut down by humans, CO2 levels must be rising because there are fewer plants that remove CO2 through photosynthesis.
Which statement is not part of the first law of thermodynamics?
A. Any energy transformation loses some energy to its surroundings as heat. B. The amount of energy in the universe is constant. C. Energy cannot be created or destroyed. D. Energy can be converted to other forms of energy. E. None of the answer choices is correct.