Is it possible that the carbon atoms in your body may have once made up the living tissues of another person or animal in earlier times? This is
A. impossible since carbon can't enter a living system more than once.
B. possible since carbon cycles through the biosphere.
C. possible only if you are a cannibal.
D. highly unlikely since carbon is always tied up in molecules in organisms or minerals.
Answer: B
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The atomic number of an atom is
A. the number of protons in the atom. B. the number of neutrons in the atom. C. the number of protons and electrons in the atom. D. the number of protons and neutrons in the atom. E. None of these choices are correct.
Which of the following represents a different principle for food preservation?
A. Heating B. Addition of salt C. Freeze-drying D. Smoking
When a plant cell is placed in a hypotonic solution, the cell wall prevents ____
a. plasmolysis b. diffusion c. active transport d. the cell from bursting e. the cell from shrinking
Fossils of prokaryotic cells are dated as far back as approximately ________ billion years ago.
A. 2.8 B. 3.8 C. 1.5 D. 4.8