Life: The Science of Biology

David E. Sadava, David M. Hilliss, H. Craig Heller,May Berenbaum

Chapter 3

Proteins, Carbohydrates, and Lipids - all with Video Answers

Educators

Chapter Questions

Problem 1

The most abundant molecule in the cell is
$a$ a carbohydrate.
$b$. a lipid.
$c .$ a nucleic acid.
$d .$ a protein.
$e .$ water

Aditya Sood

Aditya Sood

Numerade Educator

Problem 2

All lipids are
$a .$ triglycerides.
$b .$ polar.
$c .$ hydrophilic.
d. polymers of fatty acids.
$e .$ more soluble in nonpolar solvents than in water.

Arwen Xu

Numerade Educator

Problem 3

All carbohydrates
$a$. are polymers.
$b$. are simple sugars.
$c .$ consist of one or more simple sugars.
$d$. are found in biological membranes.
$e .$ are more soluble in nonpolar solvents than in water.

Aditya Sood

Numerade Educator

Problem 4

Which of the following is not a carbohydrate?
a. Glucose
$b .$ Starch
$c .$ Cellulose
$d .$ Hemoglobin
$e .$ Deoxyribose

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 5

All proteins
$a$. are enzymes.
$b$. consist of one or more polypeptide chains.
$c .$ are amino acids.
$d .$ have quaternary structures.
$e .$ are more soluble in nonpolar solvents than in water.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 6

Which of the following statements about the primary structure of a protein is not true?
$a$. It may be branched.
$b$. It is held together by covalent bonds.
$c .$ It is unique to that protein.
$d$. It determines the tertiary structure of the protein.
$e .$ It is the sequence of amino acids in the protein.

Aditya Sood

Numerade Educator

Problem 7

The amino acid leucine
$a .$ is found in all proteins.
b. cannot form peptide linkages.
$c .$ has a hydrophobic side chain.
$d .$ has a hydrophilic side chain.
$e .$ is identical to the amino acid lysine.

Nicholas Mogoi

Numerade Educator

Problem 8

The quaternary structure of a protein
$a .$ consists of four subunits- hence the name quaternary.
$b .$ is unrelated to the function of the protein.
$c .$ may be either alpha or beta.
$d$. depends on covalent bonding among the subunits.
$e .$ depends on the primary structures of the subunits.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 9

The amphipathic nature of phospholipids is
a. determined by the fatty acid composition.
$b$. important in membrane structure.
$c .$ polar but not nonpolar.
$d$. shown only if the lipid is in a nonpolar solvent.
$e .$ important in energy storage by lipids.

Aditya Sood

Numerade Educator

Problem 10

Which of the following statements about condensation reactions is not true?
$a .$ Protein synthesis results from them.
$b$. Polysaccharide synthesis results from them.
$c .$ They involve covalent bonds.
$d .$ They consume water as a reactant.
$e .$ Different condensation reactions produce different kinds of macromolecules.

Christina Sorrentino

Christina Sorrentino

Numerade Educator