Explain how the heart of a double-pithed frog can continue to contract in an organized manner after the nervous system is destroyed.
What will be an ideal response?
The heart has a pacemaker (sinoatrial node) and its own conduction system, which can operate independently of the nervous system.
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How many pairs of ribs do male and female
humans have?
a. 12 in males and 13 in females b. 12 in males and 11 in females c. 12 in males and 12 in females d. 14 in males and 12 in females e. 14 in males and 14 in females
Gene transcription is induced by
a. A. b. B. c. C. d. D. e. none of these
The part of the plant that allows for the exchange of carbon dioxide and oxygen is the:
a. Root b. Stomata c. Xylem d. Phloem e. Cuticle
The methanogenic archaeans are ____ that pull electrons from ____.
A. chemoautotrophs; oxygen B. chemoheterotrophs; carbon dioxide C. chemoautotrophs; water D. chemoheterotrophs; methane E. chemoautotrophs; hydrogen gas