Problem:OPTIONS:
- green
- purple
- white
- blue

Answer the following question given this paragraph: Like strong acids, strong bases can be harmful to organisms and damaging to materials. Bases have a bitter taste and feel slimy to the touch. They can also burn the skin. Bases, like acids, can be identified with litmus paper. Bases turn red litmus paper blue. Q: What color does red litmus paper turn in the presence of a base? A:
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A: blue

Problem:OPTIONS:
- kinetic energy
- mechanical energy
- carbon energy
- chemical energy

Answer the following question given this paragraph: Amplifier: Tim Walker; Battery: Emilian Robert Vicol. Portable amplifiers have batteries that store chemical energy . Amplifier: CC BY 2.0; Battery: Public Domain. Q: Portable amplifiers have batteries that store what type of energy? A:
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A: chemical energy

Problem:OPTIONS:
- polypeptides
- protons
- carboxyl
- peptides

Answer the following question given this paragraph: the conditions, amino acids can act as either acids or bases, which means that proteins act as buffers. The pH at which an amino acid exists as the zwitterion is called theisoelectric point (pI). The amino acids in a protein are linked together by peptide bonds. Protein chains containing 10 or fewer amino acids are usually referred to as peptides, with a prefix such as di- or tri- indicating the number of amino acids. Chains containing more than 50 amino acid units are referred to as proteins orpolypeptides. Proteins are classified globular or fibrous, depending on their structure and resulting solubility in water. Globular proteins are nearly spherical and are soluble in water; fibrous proteins have elongated or fibrous structures and are not soluble in water. Protein molecules can have as many as four levels of structure. The primary structure is the sequence of amino acids in the chain. The secondary structure is the arrangement of adjacent atoms in the peptide chain; the most common arrangements are -helices or -pleated sheets. The tertiary structureis the overall three-dimensional shape of the molecule that results from the way the chain bends and folds in on itself. Proteins that consist of more than one chain have quaternary structure, which is the way the multiple chains are packed together. Four types of intramolecular and intermolecular forces contribute to secondary, tertiary, and quaternary structure: (1) hydrogen bonding between an oxygen or a nitrogen atom and a hydrogen atom bound to an oxygen atom or a nitrogen atom, either on the same chain or on a neighboring chain; (2) ionic bondingbetween one positively charged side chain and one negatively charged side chain; (3) disulfide linkages between cysteine units; and (4) dispersion forcesbetween nonpolar side chains. Because of their complexity, protein molecules are delicate and easy to disrupt. Adenatured protein is one whose conformation has been changed, in a process called denaturation, so that it can no longer do its physiological job. A... Q: Protein chains containing 10 or fewer amino acids are usually referred to as what? A:
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A: peptides

Problem:OPTIONS:
- distillate
- glacier
- dew
- frost

Answer the following question given this paragraph: Frost is solid water that forms when water vapor undergoes deposition. Q: What is solid water that forms when water vapor undergoes deposition? A:
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A:
frost