Exam 3: Lifes Components: Biological Molecules

Wax is a lipid.

Match the following. A) DNA B) lipoproteins C) glycoproteins D) polysaccharide E) structural proteins -Found in hair and cartilage

Polypeptides differ in their ________ and ________ of amino acids.

The monomers of polysaccharides are:

Match the following. A) DNA B) lipoproteins C) glycoproteins D) polysaccharide E) structural proteins -Serve as cell surface receptors

All of the following are functions of proteins except:

All other levels of protein structure are dictated by the primary structure.

Your muscles contract using contractile proteins to produce movement.

The precursor from which steroid hormones are made is ________.

Why are proteins, polysaccharides, and nucleic acids considered polymers, but lipids are not?

Glycogen is used to store ________ in the ________.

The monomers of polysaccharides are:

Explain the relationship between DNA and proteins.

Refer to the figure below, and then answer the question that follows. -Explain why you will always find an amino group at one end of a polypeptide chain and a carboxyl group at the other end.

Before DNA was established as the genetic material, proteins were considered the most likely molecules to serve this role. In part this belief was based on the fact that there are 20 building blocks (20 different kinds of amino acids) for proteins versus 4 building blocks (4 different nucleotides) for DNA. If proteins stored a code, there would be a far greater number of code words possible for a protein of a given number of amino acids than for a DNA molecule of the same number of nucleotides. For example, there are 16 different sequences (4²) possible for a DNA two nucleotides long and 400 (20²) different sequences possible for a protein two amino acids long. For a sequence three nucleotides or three amino acids in length, the number of distinct DNA sequences is ________, and the number of distinct protein sequences is ________.

All hormones are steroids.

________ is a branch of chemistry that studies carbon compounds.

Mutations are changes to the information in DNA. What would happen to an enzyme's ability to function if a mutation changed the order of some of the amino acids in its polypeptide chain?

A series of amino acids linked in linear fashion is called a ________.

What do polysaccharides, such as cellulose; nucleic acids, such as DNA; and proteins, such as keratin, have in common?