Which of the following statements about the regulation of respiration is false?
a. Respiratory centers in the medulla control the transition from inspiration to expiration.
b. Carbon dioxide concentration is the most important chemical stimulus for regulating
respiratory rate.
c. Chemoreceptors in the walls of various arteries are sensitive to carbon dioxide levels in
the blood.
d. A group of neurons in the ventral medulla only become active when we need to breathe
forcefully.
e. Chemoreceptors may be sensitive to oxygen, carbon dioxide, and/or hydrogen ion
concentration.
A
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When a plant has a hypersensitive response, production of ____ triggers effects such as the expression
of PR proteins.
a. oligosaccharins b. salicylic acid c. ethylene d. cytokinin e. brassinosteroids
Did H. sapiens mate with H. neanderthalensis? How do we know? What will be an ideal response?
The chances of guessing the right answer to this question are
A. 1/1. B. 1/2. C. 1/3. D. 1/4.
Which of the following statements about TSEs (transmissible spongiform encephalopathies) is false?
A. Viroids are the likely cause of TSEs. B. The incidence of Creutzfeldt-Jakob disease in humans increased after an outbreak of mad cow disease in England, suggesting that mad cow disease may be transmitted to humans. C. TSEs include scrapie in sheep, mad cow disease, chronic wasting disease in deer and elk, and kuru and variant Creutzfeldt-Jakob disease in humans. D. TSEs do not seem to be affected by treatments that would eliminate nucleic acid-based diseases. E. Infectious TSE preparations do not seem to contain DNA or RNA.