Question

1. to which group of macromolecules do enzymes belong? a. carbohydrates b. lipids c. nucleic acids d. proteins 17. which of the following is not a function of carbohydrates? a. structural support (chitin & cellulose) b. transport of substances into & out of cells and around the body (transport molecules & hemoglobin) c. energy storage in plants and animals (starch & glycogen) d. main energy source for cells (simple sugars) 18. which of the following describes a saturated fat? a. a fat with saturated with hydrophobic substances b. a fat whose fatty acid tails have at least one double bond between carbon atoms c. a fat whose fatty acid tails have all single bonds between carbon atoms d. a fat that is liquid at room temperature. 19. one way to determine whether a molecule is a sugar or an enzyme is to look at the last three letters in its name. sugars end in _, and enzymes end in _. a. -ars, -mes b. -sug, -enz c. -ase, -ose d. -ose, -ase monomers are assembled into polymers by the process of: a. dehydration synthesis b. hydrolysis c. photophosphorylation d. evaporative cooling 20. all of the following are ways in which a phospholipid differs from a fat except: a. a phospholipid has two fatty acid tails and a fat has three b. a phospholipid has two fatty acid tails and a fat has three c. a phospholipid has a phosphate group associated with it and a fat doesnt d. a phospholipid has a polar head region and a non polar tail region, a fat is mostly non polar 21. all of the following are parts of a nucleotide except: a. a phosphate group b. a 5 carbon sugar c. variable r group d. nitrogenous (nitrogen) base 22. the monomer of a protein or polypeptide is called a(an): a. amino acid b. fatty acid c. monosaccharide d. nucleotide

Explanation:

1. Enzymes are proteins that act as biological catalysts.
2. Transport of substances is mainly done by proteins like transport - molecules and hemoglobin, not carbohydrates.
3. Saturated fats have fatty - acid tails with all single bonds between carbon atoms.
4. Sugars typically end in -ose and enzymes end in -ase.
5. Phospholipids have two fatty - acid tails and a phosphate group, and are important for cell membranes, while fats cushion organs and store energy. The incorrect statement is about their functions being reversed.
6. A nucleotide consists of a phosphate group, a 5 - carbon sugar, and a nitrogenous base. The variable R - group is part of an amino - acid, not a nucleotide.
7. The monomer of a protein or polypeptide is an amino - acid.

Answer:

1. D. proteins
2. B. Transport of substances into & out of cells and around the body (transport molecules & hemoglobin)
3. C. A fat whose fatty acid tails have all single bonds between carbon atoms
4. D. -ose, -ase
5. D. A phospholipid cushions internal organs of animals and a fat makes up the plasma (cell) membrane of all cells
6. C. Variable R group
7. A. Amino Acid