Biology Chapter 3 Test Part 2

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  • 1/11 Questions

    ATP

    • Is an amino acid.
    • Has a helical structure.
    • Is a high- energy molecule that can break down to ADP and phosphate.
    • Provides enzymes for metabolism.
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About This Quiz

This Biology Chapter 3 Test Part 2 focuses on biochemical topics such as lipids, amino acids, and proteins. It assesses understanding of structural differences, biochemical precursors, and enzymatic functions, essential for learners in advanced biology courses.

Biology Chapter 3 Test Part 2 - Quiz

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  • 2. 

    Which of these is not a lipid?

    • Steroid

    • Wax

    • B. fate. phospholipids

    • polysaccharide

    Correct Answer
    A. polysaccharide
    Explanation
    Polysaccharide is not a lipid because it is a type of carbohydrate, not a lipid. Lipids are organic compounds that are insoluble in water and include substances such as steroids, waxes, and phospholipids. Polysaccharides, on the other hand, are carbohydrates made up of long chains of sugar molecules and are soluble in water. Therefore, polysaccharide does not fit the definition of a lipid.

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  • 3. 

    The difference between one amino acid and another is found in the

    • Amino group.

    • Peptide bond.

    • Carboxyl group.

    • Carbon atoms.

    • R group.

    Correct Answer
    A. R group.
    Explanation
    The R group, also known as the side chain, is what differentiates one amino acid from another. It is a variable group that can consist of different atoms and functional groups, giving each amino acid its unique properties and characteristics. The amino group, carboxyl group, and carbon atoms are present in all amino acids and are not responsible for the differences between them. The peptide bond is the bond that connects amino acids together to form a protein, but it does not contribute to the differences between individual amino acids.

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  • 4. 

    Saturated fatty acids and unsaturated fatty acids differ in

    • The number of double bonds present.

    • Their consistency at room temperature.

    • The number of hydrogen atoms present.

    • All of these are correct.

    Correct Answer
    A. All of these are correct.
    Explanation
    Saturated fatty acids and unsaturated fatty acids differ in all of the mentioned aspects. Saturated fatty acids have no double bonds, are solid at room temperature, and have the maximum number of hydrogen atoms. On the other hand, unsaturated fatty acids have one or more double bonds, are liquid at room temperature, and have fewer hydrogen atoms due to the presence of double bonds. Therefore, all of these statements are correct in distinguishing between saturated and unsaturated fatty acids.

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  • 5. 

    Which of the following pertains to an RNA nucleotide, not a DNA nucleotide?

    • Contains the sugar ribose

    • Contains a nitrogen- containing base

    • Contains a phosphate molecule

    • Becomes bonded to other nucleotides by condensation

    Correct Answer
    A. Contains the sugar ribose
    Explanation
    RNA nucleotides contain the sugar ribose, while DNA nucleotides contain the sugar deoxyribose. The presence of ribose in a nucleotide indicates that it is an RNA nucleotide. The other options, such as containing a nitrogen-containing base and a phosphate molecule, are common to both RNA and DNA nucleotides. The last option, becoming bonded to other nucleotides by condensation, is a general characteristic of nucleotides and does not specifically pertain to either RNA or DNA.

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  • 6. 

    The joining of two adjacent amino acids is called a a. peptide bond.

    • Covalent bond.

    • Dehydration reaction.

    • All of these are correct.

    Correct Answer
    A. All of these are correct.
    Explanation
    The joining of two adjacent amino acids can be referred to as a peptide bond, a covalent bond, or a dehydration reaction. All of these terms accurately describe the process of linking amino acids together to form a peptide chain.

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  • 7. 

    Nearly all ____________ are ____________.

    • Proteins, enzymes

    • Enzymes, proteins

    • Sugars, monosaccharides

    Correct Answer
    A. Enzymes, proteins
    Explanation
    Enzymes are a specific type of protein that act as catalysts in biological reactions. Proteins, on the other hand, are a broader category that includes enzymes as well as other types of molecules. Therefore, it is accurate to say that nearly all enzymes are proteins, but not all proteins are enzymes.

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  • 8. 

    Nucleotides a. are composed of a sugar,

    • Nitrogen- containing base, and a phosphate group.

    • Are the monomers of fats and polysaccharides.

    • Join together by covalent bonding between the bases.

    • Are present in both DNA and RNA.

    • Nitrogen- containing base, and a phosphate group. As well as are present in both DNA and RNA.

    Correct Answer
    A. Nitrogen- containing base, and a phosphate group. As well as are present in both DNA and RNA.
    Explanation
    The correct answer is that nucleotides are composed of a sugar, nitrogen-containing base, and a phosphate group, and they are also present in both DNA and RNA. This means that nucleotides have three components - a sugar, a nitrogen-containing base, and a phosphate group - and they are the building blocks of both DNA and RNA.

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  • 9. 

    17. ____________ is the precursor of ____________.

    • Estrogen, cholesterol

    • Cholesterol, glucose

    • Testosterone, cholesterol

    • Cholesterol, testosterone and estrogen

    Correct Answer
    A. Cholesterol, testosterone and estrogen
    Explanation
    Cholesterol is the precursor of both testosterone and estrogen. This means that cholesterol is converted into these hormones through a series of enzymatic reactions in the body. Testosterone is a male sex hormone, while estrogen is a female sex hormone. Both of these hormones play important roles in various physiological processes in the body.

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  • 10. 

    The three- dimensional structure of a protein that contains two or more polypeptides is the

    • Primary structure.

    • Tertiary structure.

    • Secondary structure.

    • Quaternary structure.

    Correct Answer
    A. Quaternary structure.
    Explanation
    The quaternary structure refers to the arrangement of multiple polypeptide chains in a protein. In this case, the protein contains two or more polypeptides, indicating that it has a quaternary structure. The primary structure refers to the sequence of amino acids in a single polypeptide chain, while the secondary structure refers to the local folding patterns within a single polypeptide chain. The tertiary structure refers to the overall three-dimensional shape of a single polypeptide chain. Therefore, the correct answer is quaternary structure.

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  • 11. 

    Covalent bonding between R groups in proteins is associated with the ____________ structure.

    • Primary

    • Tertiary

    • Secondary

    • None of these are correct.

    Correct Answer
    A. Tertiary
    Explanation
    Covalent bonding between R groups in proteins is associated with the tertiary structure. The tertiary structure of a protein refers to the three-dimensional arrangement of its polypeptide chain, including the folding and bonding of R groups. These covalent bonds between R groups play a crucial role in stabilizing the overall structure of the protein and determining its specific shape and function. The primary structure refers to the linear sequence of amino acids, while the secondary structure refers to local folding patterns such as alpha helices and beta sheets. Therefore, the correct answer is tertiary.

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  • Mar 19, 2023
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  • Sep 24, 2011
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    Clashaw
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