protein Bio

Which of the following are functions of proteins?

-They catalyze chemical reactions.-They transport ions and molecules across cell membranes.-They play a key role in the contraction of muscles.-They provide structural support for many animal tissues.

How many polypeptides are present in a protein whose highest level of structure is tertiary structure?

1 polypeptide only

Proteins are polymers made up of how many different amino acids?

20

The structure of proteins is usually discussed in terms of a hierarchy of how many levels?

4

Which of the following accurately describes the chemical structure of a typical amino acid found in a protein?

A central carbon atom is bound to an amino group, carboxyl group, a side chain, and a hydrogen atom.

Select the disease type that could result from a deficiency in chaperone proteins.

A disease caused by improper folding of proteins.

What are the three major structural components of an amino acid?

Amino group Carboxyl group Side chain (R)

(acidic or basic?) The carboxyl group is what and the amino group is what

Blank 1: acidic Blank 2: basic

The two major functional groups found in all amino acids are the basic group and the acidic group.

Blank 1: amino Blank 2: carboxyl

During this type of reaction, a molecule of water is removed.

Dehydration

Which type of interaction plays a key role in determining both the secondary and tertiary structure of a protein?

Hydrogen bonds

In general, where are nonpolar and polar amino acids found in a folded protein?

Non-polar - interior; polar -

What type of bond forms between two amino acids during dehydration synthesis?

Peptide bond

Carbon-oxygen and carbon-nitrogen bonds are described as which of the following?

Polar covalent Formed by an unequal sharing of electrons

Which part of an amino acid is always acidic?

The carboxyl group

What is the primary structure of a protein?

The sequences of secondary structural elements in the polypeptides.

Of the following list, choose the functions of proteins in living cells.

They play a key role in moving materials within cells. They transport oxygen in the blood of vertebrates. They catalyze chemical reactions. They help the body recognize and destroy foreign microbes and cancer cells.

what amino acids that are most likely to be found in the interior of a protein.

Valine Phenylalanine Leucine

Proteins are composed of monomers called

amino acids

What are the building blocks of proteins?

amino acids

A general (all-inclusive) term for organic molecules that have the same molecular formula, but that differ in their structure or in the spatial arrangement of their atoms, is

isomers

Which of the following determines the function of a protein molecule?

its shape

arbohydrates are composed of monomers called

monosaccharides

You are studying a protein and noticed that it contains two regions made of beta sheets connected by an alpha helix. this type of recurring structure that can be found in proteins with very different functions is called

motif

nucleic acids are composed of monomers called

nucleotides

The covalent bond that joins two amino acids is called a Blank 1 of 1 bond.

peptide

A long molecule built by linking together a large number of small, similar molecules termed monomers is which of the following?

polymers

structural levels of a protein describe a protein with a single polypeptide chain are

primary ,secondary, tertiary

The structure of Blank 1 of 1 is usually discussed in terms of a hierarchy of 4 levels.

protein

primary secondary tertiary quaternary

the linear sequence of amino acids repetitive folding patterns such as alpha helix and beta pleated sheet the overall 3-D shape of each polypeptide how two or more polypeptides interact to form a protein