Which of these is not a characteristic of carbon?
a. forms four covalent bonds
b. bonds with other carbon atoms
c. is sometimes ionic
d. can form long chains
e. sometimes shares two pairs of electrons with another atom
Which of the following reactions combines two monomers to produce a polymer?
d. None of the above are correct
The monomers of the carbohydrates are the
Which of the following polysaccharides is used as an energystorage molecule in plants?
Fructose and galactose are both isomers of
A fatty acid is unsaturated if it
a. contains hydrogen.
b. contains carbon–carbon double bonds.
c. contains a carboxyl (acidic) group.
d. is bound to a glycerol.
Which of the following is incorrect regarding phospholipids?
a. The heads are polar.
b. The tails are nonpolar.
c. They contain a phosphate group in place of one fatty acid.
d. They are energy-storage molecules in the cell.
A lipid that contains four fused carbon rings is a
The chemical differences between one amino acid and another is due to which of the following?
a. amino group
b. carboxyl group
c. R group
d. peptide bond
e. carbon atoms
Which of the following levels of protein structure is determined by interactions of more than one polypeptide chain?
Which of the following is formed by the linking of two amino acids?
a. a peptide bond
b. a functional group
c. quaternary structure
d. an ionic bond
Which of the following is incorrect regarding nucleotides?
a. They contain a sugar, a nitrogen-containing base, and a phosphate group.
b. They are the monomers of fats and polysaccharides.
c. They join together by alternating covalent bonds between the sugars and phosphate groups.
d. They are present in both DNA and RNA.
Which of the following is correct regarding ATP?
a. It is an amino acid.
b. It has a helical structure.
c. It is a high-energy molecule that can break down to ADP and phosphate.
d. It is a nucleotide component of DNA and RNA.
Which of the following is correct concerning an RNA molecule?
a. It contains the sugar ribose.
b. It may contain uracil as a nitrogen-containing base.
c. It contains a phosphate molecule.
d. All of the above are correct.