Ecologists determined that, regardless of the richness
of the ecosystem, energy passes through no more
than __________ trophic levels.
a. one or two
b. two or three
c. three or four
d. four or five
e. five or six
Answer: d
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. Imagine that you have been bitten by a poisonous snake with neurotoxic venom. Thankfully, you are rushed to the emergency room of a local hospital, where you receive antivenom. Your condition subsequently returns to normal. Before your release, your physician chastises you for not being more careful. He informs you that you were within minutes of not being able to breathe as the result of the venom's effect on the nervous control of your breathing. As a biology student, you consider this carefully, and hypothesize that your breathing would have stopped because the venom would cause
A. your trachea to collapse. B. your lungs to collapse. C. your diaphragm to become inactive. D. your blood to lose oxygen.
Cilia and flagella are both made of ________
A) actin B) tubulin C) intermediate proteins D) phospholipids
Which of these hormone-action pairs is mismatched?
A. Aldosterone-sodium reabsorption B. Oxytocin-suckling C. Atrial natriuretic peptide-muscle contraction D. Cortisol-glucose regulation E. Testosterone-secondary sex characteristics
The sliding filaments that move relative to each other during muscle contraction are ________.
Fill in the blank(s) with the appropriate word(s).