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BIOCHEMISTRY PRACTICE TEST 2026 EXAM
SCRIPT WITH VERIFIED SOLUTIONS
โ Living organisms are made up of energy and matter. True or false? Answer: True โ Why is chemistry important in the study of biology? Answer: The body is composed of chemical elements. Chemical reactions occur in the body. Chemistry studies matter and energy. โ The most abundant elements in the body are _____.. Answer: hydrogen, carbon, nitrogen, oxygen โ This element is needed for cellular respiration.. Answer: oxygen โ Elements abundant in the body are not abundant on Earth. True or False? Answer: False โ What French scientist is known as the "Father of Modern Chemistry" and showed that organisms are composed of the same chemical elements as nonliving things? Answer: Antoine Lavoisier
โ T or F. Each element consists of only one type of atom. Answer: True โ Any particular element can always be identified by its _____.. Answer: number of protons โ The subatomic particles/units that govern potential chemical reactions among elements are. Answer: electrons โ Which statement is correct? The number of electrons of a neutral atom always equals the number of protons. The number of neutrons always equals the number of protons. The number of neutrons always equals the number of electrons. Atomic weight is identical to atomic mass.. Answer: The number of electrons of a neutral atom always equals the number of protons. โ Atomic number is the number of an atom's _____.. Answer: protons
โ Valence is the number of electrons an atom must gain or lose in order to _____ its outer shell or have a stable octet in its outer shell.. Answer: complete โ Chemical reactions are the result of an atom attempting _____.. Answer: to rearrange its configuration to result in a complete outer shell or have a stable octet. โ How is a sodium ion symbol written? Answer: Na+ โ A bond based on intermolecular forces between hydrogen and fluorine, nitrogen, or oxygen is a _____.. Answer: hydrogen bond โ Covalent bonds do not gain or lose electrons, but rather share electrons.. Answer: True โ What is required for reactants to form bonds? Answer: energy input โ What occurs during a decomposition reaction? Answer: A compound partitions into its components. โ When bonds are broken, energy is released.. Answer: True
โ The rate and direction of reactions are greatly influenced by the _____.. Answer: both of the above because they relate to the same principle โ Electrons in an excited state are more likely to enter into chemical reactions.. Answer: True โ A substance that enters into a chemical reaction is called a(n) _____.. Answer: reactants โ In the reaction B + KL + H, if an additional B is added, the result will be _____.. Answer: more L and H will be produced โ Chemical equilibrium results if _____.. Answer: forward reaction rate equals reverse reaction rate โ An organic molecule will always contain _____.. Answer: carbon โ Inorganic compounds are usually held together by _____ bonds.. Answer: ionic โ Water can only dissolve inorganic compounds.. Answer: False
โ Identify this symbol. Cl-. Answer: anion โ Water's _____ property creates positive and negative ions, which are essential for chemical reactions.. Answer: ionization โ How many electrons does carbon lack in its outer shell? Answer: 4 โ Carbon is ideally suited to form ionic bonds.. Answer: False โ Why can carbon form very large molecules? Answer: It can bond with other carbon atoms that are bonded to other molecules. โ What happens when organic molecules decompose? Answer: Energy is released. โ When compounds that are formed from ionic bonds decompose, the products are usually what? Answer: ions of the original elements โ Large organic molecules that are synthesized from multiple identical subunits are _____.. Answer: carbohydrates polymers
proteins nucleic acids โ Select all that apply. Functional groups are a group of molecules attached to a carbon-based core of an organic molecule. Key functional groups are _____.. Answer: carbonyls aminos phosphates โ Which statement represents dehydration synthesis? Answer: carbohydrate polymers formed as water is removed โ C6H12O6 is a type of. Answer: carbohydrate โ Glucose has _____ carbon atoms.. Answer: 6 โ Starch is a monosaccharide.. Answer: False โ The simplest sugars are generally called _____.. Answer: monosaccharides
