Which of the following is NOT true of the cell theory?
A. New cells are built from recycled components of old, dead cells
B. New cells originate from pre-existing cells by cell division
C. The cell is the smallest unit of life
D. All of the above ARE true
Ans: A. New cells are built from recycled components of old, dead cells
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Oxygen has an atomic mass of 16 and an atomic number of 8 . How many neutrons are present?
A. 8 B. 16 C. 4 D. 24
The common basilisk lizard will run across water on its hind legs in an erect position when startled by predators. This lizard has large feet and flaps of skin along its toes. What properties of water allow this lizard to walk on water?
A. Hydrogen bonds absorb heat when they break and release heat when they form. This helps to minimize temperature changes. B. The surface tension created by hydrogen bonds is greater than the weight of the lizard initially. C. Polar molecules are attracted to ions and polar compounds, making these compounds soluble. D. Hydrogen bonds hold water molecules together; many hydrogen bonds must be broken for water to evaporate.
Structural isomers differ from each other
a. in the arrangement of their covalent bonds. b. in their molecular formulas. c. by being mirror images of each other that cannot be superimposed on each other. d. by having double covalent bonds instead of single bonds. e. by having different atomic isotopes in their molecules.
Which of the following is an application of the
first law of thermodynamics? a. The level of entropy increases as time passes. b. Living organisms represent an exception to the laws of energy. c. The quantity of energy does not increase or decrease in the universe. d. Fungi and plants do not make their own energy but derive it from somewhere else. e. The amount of energy found in the compounds on one side of an equation is equal to that on the other side