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Exam 1
Biology - final - Exam 1 questions
| Question | Answer |
|---|---|
| Energy is ultimately lost from ecosystems in the form of: | Heat |
| Consider the following statement: "If mammals feed their young with breast milk, and dolphins are mammals, then dolphins feed their young breast milk." This statement is an example of: | Deductive reasoning |
| Characters are transmitted from parents to offspring. ______ are the units of inheritance | Genes |
| {2 H2 + O2 --> 2 H2O} Which of the chemicals in the equation are compounds? | only H2O |
| Organisms made of a single cell that lacks a nucleus, are very small and do not contain membrane bound organelles belong to two different domains. What are the domains? | Archaea and Bacteria |
| Natural selection is a process that affects the frequency of characteristics of populations because: | it results in mutations occurring in the population |
| About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements account for approximately 96% of living matter? | Carbon, hyrdogen, nitrogen, oxygen |
| When are atoms MOST stable? | When all of the electron orbitals in the valence shell are filled with |
| From its atomic number of 16, it IS possible to predict that a sulfur atom in the absence of chemical reactions always has: | 16 protons and 16 electrons |
| How many electrons are in the inner ring and outer ring of a FULL valence shell. | 2 in inner ring, 8 in outer ring |
| How many hydrogen atoms are in the substrates/reactants of the following reaction? {C12H22O11 --> 2 C6H12O6} | 24 |
| What is the difference between covalent bonds and ionic bonds? | Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between charged atoms |
| Sugar dissolves when stirred into water. The sugar is the ____, the water is the _____, and the sweetened water is the _____. | solute... solvent... solution |
| What is chemical equilibrium? | Forward and reverse reactions continue with no net effect on the concentrations of the reactants and products |
| The tendency of water to stick to other water molecules is called: | cohesion |
| A base _____ | increases the pH of a solution |
| You are studying a lake and find that the concentration of OH^- ions in 10^-8. What is the concentration of hydrogen ions [H^+]. | 10^-6 |
| What is the pH of a solution with a hydrogen ion [H^+] concentration of 10^-12 M? | pH 12 |
| Hydrophobic substances such as vegetable oil are _____. | nonpolar substances that repel water molecules |
| Recent research suggests that side effects from Ritalin, the drug used to treat attention deficit disorder, may be caused by contamination of enantiomers, or molecules that: | are mirror images of one another |
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josie_d
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