What is the main form of nitrogenous waste released by birds to their environment?
a. urea
b. nitrate
c. ammonia
d. uric acid
Answer: d. uric acid
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Which of the following is the correct sequence that describes the excitation and contraction of a skeletal muscle fiber?
1. Tropomyosin shifts and unblocks the cross-bridge binding sites. 2. Calcium is released and binds to the troponin complex. 3. Transverse tubules depolarize the sarcoplasmic reticulum. 4. The thin filaments are ratcheted across the thick filaments by the heads of the myosin molecules using energy from ATP. 5. An action potential in a motor neuron causes the axon to release acetylcholine, which depolarizes the muscle cell membrane. A) 1 ? 2 ? 3 ? 4 ? 5 B) 2 ? 1 ? 3 ? 5 ? 4 C) 2 ? 3 ? 4 ? 1 ? 5 D) 5 ? 3 ? 1 ? 2 ? 4 E) 5 ? 3 ? 2 ? 1 ? 4
If life exists on Mars, it is predicted that organisms would live underground and be anaerobic. Why?
What will be an ideal response?
The tiny chambers in osteons that contain osteocytes are called _____.
Fill in the blank(s) with the appropriate word(s)
Tunde is abnormally slender. Which of the following conditions is she more likely to have compared to an obese person, given the information in this chapter?
A) heart disease and stroke B) cancers C) heartburn and indigestion D) hypothermia and injury due to trauma