A moth preparing for flight on a cold morning may warm its flight muscles via _____
A) acclimatization
B) torpor
C) evaporative cooling
D) shivering thermogenesis
Answer: D
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If an isotope's half-life is 100 years
A. in 50 years, only half of the atoms in a sample of that isotope will remain. B. that isotope will no longer exist in 50 years. C. that isotope will no longer exist in 200 years. D. in 200 years, only half of the atoms in a sample of that isotope will remain. E. in 100 years, only half of the atoms in a sample of that isotope will remain.
Four of the five answers listed below are conditions caused by vitamin deficiency. Select the
exception. a. scurvy b. pellagra c. rickets d. beriberi e. goiter
Which of the following facts supports the claim that mitochondria developed from bacteria that were long ago phagocytosed into eukaryotic cells?
a. Mitochondria have their own DNA. b. Mitochondria are the "powerhouses" of the cell. c. Mitochondria have proteins for the synthesis of ATP. d. Mitochondria have flagella for motion. e. Mitochondria are small and easily transported across the membrane.
What prompts a newborn baby to start to breathe?
A) an increase in the concentration of carbon dioxide in the baby's blood B) a decrease in the concentration of oxygen in the baby's blood C) a change in the temperature on the surface of the skin D) exposure to air