Buy Organic Chemistry and Macromolecules

Buy Organic Chemistry and Macromolecules
Buy Organic Chemistry and Macromolecules
1. Denaturation of proteins involves disruption of the
A. Primary structure
B. Secondary structure
C. Tertiary structure
D. Covalent bonding
Answer is C: Protein “tertiary structure” is held together by the relatively weak
attraction between different parts of the protein molecule known as “hydrogen
bonding”. This structure is the most easily disrupted.
2. One of the following is NOT a function of lipids in the body. Which one?
A. Function as coenzymes
B. Used in phospholipids
C. Used to make prostaglandins
D. Steroids are produced from them
Answer is A: Coenzymes are proteins (not lipids).
3. Amino acids are the building blocks of all proteins. As more amino acids are
added, the protein chain tends to fold upon itself in a characteristic way. This
characteristic of a protein is called the:
A. Primary structure
B. Secondary structure
C. Tertiary structure
D. Quaternary structure
Answer is C: The shape produced by folding is the tertiary structure. Primary structure is the sequence in which the amino acids are joined. Secondary structure is any
repetition of the primary structure. Quaternary structure does not exist.
4.6 Organic Chemistry and Macromolecules
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4. Which of the following is the correct combination for the nucleic acid DNA?
A. Phosphate, ribose, uracil
B. Phosphate, deoxyribose, uracil
C. Phosphate, ribose, adenine
D. Phosphate, deoxyribose, adenine
Answer is D: “Deoxyribose” supplies the “D” in DNA. The base uracil occurs in
RNA (not DNA) where it substitutes for the thymine that occurs in DNA.
5. To which of the following class of biological compounds do all enzymes belong?
A. Hormones
B. Proteins
C. Carbohydrates
D. Lipids
Answer is B: All enzymes are proteins.
6. The twisting of a polypeptide chain into a characteristic shape such as a helix is
an example of which of the following?
A. Primary structure
B. Secondary structure
C. Tertiary structure
D. Quaternary structure
Answer is C: The shape of the protein molecule is the tertiary structure of the
protein.
7. Which one of the following is NOT a steroid compound?
A. Stearic acid
B. Estrogen
C. Cholesterol
D. Testosterone
Answer is A: Stearic acid is a fatty acid. The sex hormones estrogen and testosterone are derived from cholesterol.
8. Which of the following carbohydrates are able to pass through the plasma
membrane?
A. Disaccharides
B. Sucrose
C. Glycogen
D. Monosaccharides
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