practice quiz 2 490 prac set 4

Lipids play a major role in cells as...

1) a form of energy storage 2) components of cell membranes 3) part of the cell

A disulfide bond is formed between ____________ residues.

Cysteine

In the Fluid Mosaic Model of biological membrane structure, transmembrane proteins are

Embedded nearly randomly in the lipid bilayer

Mutation in the DNA will ONLY affect primary structure of the protein but never tertiary. True/False?

False

The currently accepted model of membrane structure is called the ____________ model.

Fluid Mosaic

What are involved in forming the tertiary structure of proteins?

H Bonds Hydrophobic Interactions Ionic bonds

In most proteins, [alpha] helices and [beta] sheets fold into globular domains with __________ on the inside.

Hydrophobic amino acids

Water is an ideal solvent in cells because?

It is a polar molecule that can form hydrogen bonds with itself and with other polar molecules.

Introducing a double bond into a fatty acid has the effect of putting a(n) _____________________ into the conformation of the molecule.

Kink

Cell membrane are composed principally of

Lipids

Phospholipids in a membrane commonly

Move laterally in the plane of the bilayer and Rotate within the bilayer

In the primary structure of a protein amino acids are joined together by _______________ bonds.

Peptide

The most common molecules in cellular membranes are the

Phospholipids

Proteins must have more than one _________ to have a quaternary structure.

Polypeptide chain

The [alpha]-helix is an example of which level of protein structure?

Secondary

Which part of the amino acid makes it unique from all others?

Side chain

The linear order of amino acids in a protein determines its

Structure

Proteins can be described as which of the following? a) are made from only 4 type of monomers b) they carry out the program encoded by genes c) are synthesized in the nucleus d) they are the primary form of energy for a cell

They carry out the program encoded by genes

Cholesterol is an amphipathic molecule. True/False?

True