Chapter 3

A fatty acid contains primarily carbon and hydrogen atoms, and its hydrocarbon tail is very hydrophobic. What kind of interaction can occur between hydrocarbon tails of fatty acids? A. Van der Waals B. Hydrogen bond C. Ionic interaction D. Covalent bond

A. Van der Waals

Adjacent nucleotides in an RNA chain are held together by: A. covalent bonding B. ionic bonding C. hydrogen bonding D. All of these choices are correct E. the hydrophobic effect.

A. covalent bonding

An unsaturated fatty acid contains: A. one or more double bonds between carbon atoms B. one or more double bonds between hydrogen atoms C. only carbon and hydrogen D. only single covalent bonds between carbon atoms.

A. one or more double bonds between carbon atoms

Triacylglycerols are used in cells primarily for: A. information storage B. cell membrane biosynthesis C. energy storage D. biological catalysis E. movement.

C. energy storage

The formation of which of the following large organic molecules from their respective building blocks results in the release of at least one water molecule? A. proteins B. All of these choices are correct C. phospholipids D. polysaccharides E. nucleic acids

B. All of these choices are correct

Two of the main ingredients in plant fertilizer are phosphorus and nitrogen. These elements are found in which classes of biomolecules? A. proteins and carbohydrates B. DNA and proteins C. carbohydrates and DNA D. lipids and carbohydrates

B. DNA and proteins

_____ are the subunits of nucleic acids, and _____ are the subunits of proteins. A. Nucleoli; amino acids B. Nucleotides; amino acids C. Polypeptides; sugars D. Amino acids; nucleic bases D. Bases; polypeptides

B. Nucleotides; amino acids

If you isolate a single nucleotide from a nucleic acid chain and determine that the nitrogenous ring structure is cytosine, you could say with certainty that the nucleotide may have come from: A. neither DNA nor RNA B. RNA but not DNA C. either DNA or RNA D. DNA but not RNA

C. either DNA or RNA

Carbohydrates and proteins are two types of macromolecules. Which functional characteristic of proteins distinguishes them from carbohydrates? A. efficient storage of usable chemical energy B. None of the other answer options is correct C. large amount of stored information D. ability to catalyze biochemical reactions E. tendency to make cell membranes hydrophobic

D. ability to catalyze biochemical reactions

The class of organic molecules defined by a physical property rather than a structure are the: A. carbohydrates B. None of the other answer options are correct C. nucleic acids D. lipids E. proteins.

D. lipids

Which of the organic molecules are commonly used for energy storage? A. proteins, carbohydrates, and lipids B. carbohydrates, nucleic acids, and lipids C. proteins and nucleic acids D. lipids and carbohydrates E. nucleic acids and lipids

D. lipids and carbohydrates

Which type of fatty acids would be likely to participate in the greatest amount of van der Waals forces with other fatty acids? A. Fatty acids with: long tails and low saturation B. short tails and high saturation C. short tails and low saturation D. long tails and high saturation

D. long tails and high saturation

Which component of an amino acid differs from one amino acid to another? A. the alpha-carbon atom B. the amino group C. the carboxyl group D. the side chain E. the hydrogen atom opposite the R group

D. the side chain

All of these groups are a component of an amino acid except: A. a carboxyl group B. an alpha carbon C. an amino group D. an R group E. a phosphate group

E. a phosphate group

Pyrimidine and purine bases are found in: A. fatty acids B. lipids C. carbohydrates D. proteins E. nucleic acids

E. nucleic acids

Peptide bonds are characteristic of: A. nucleic acids B. carbohydrates C. lipids D. fatty acids E. proteins

E. proteins