Which hormone is released by neurosecretory cells extending from the hypothalamus?
A) estrogen
B) growth hormone
C) oxytocin
D) calcitonin
Answer: C
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What is gross primary production?
A. The carbon fixed during photosynthesis. B. All of the carbon fixation after cellular respiration is accounted for. C. Energy released by both primary and secondary consumers. D. Photosynthetic production plus energy recycled through detritivores. E. None of the answers is correct.
Movement of oxygen and carbon dioxide between alveoli and blood occurs by what process?
A) osmosis B) simple diffusion C) facilitated diffusion D) primary active transport E) secondary active transport
The difference between chromatin material and chromosomes is
A. their structure. B. the kinds of atoms that they contain. C. where you find them. D. that one is a gas and the other is a liquid.
Which of these statements is true regarding portals of exit?
A) The portal of exit for tuberculosis is the skin. B) In most cases, a microbe uses the same portal for both entry and exit. C) The urinary tract is the most common portal of exit. D) Polio viruses most often use the respiratory portal of exit.