BB 314 Units 1-4

Guanine

Purine, matches with Cytosine

Adenine

Purine, matches with Thymine or Uracil

Thymine

Pyrimidine, matches with adenine

Protein structure: Results from covalent and non-covalent interactions between different polypeptide chains.

Quaternary

Properties of amino acids vary because of the___

R groups

Protein structure: Results from repetitive hydrogen bonds between atoms in the peptide backbone.

Secondary Structure

Protein structure: alpha helices and beta pleated sheets

Secondary structures

Protein structure: Can be altered when a protein is reversibly denatured.

Secondary, tertiary, quaternary

Characteristics of Peptide-bonded backbone of a polypeptide

-The R-groups (side chains) project out from the backbone such that they may interact with each other. -The backbone has an amino group on one end and a carboxyl group on the other end thus providing directionality. -The structure is flexible due to single bonds on either side of the peptide bonds in the backbone.

The design of the nuclear envelope is such that _____

-its outer membrane is continuous with the ER. -its perinuclear space is continuous with the ER lumen. -it is a double membrane. -the nuclear pores dispersed throughout the envelope connect the cytoplasm with the nucleoplasm. -the chromatin is able to attach to the inner envelope at discreate regions. -the inner membrane is in direct contact with the nuclear lamina. -the outer nuclear envelope have ribosomes bound to it.

Which amino acids are positively charged in an aqueous solution?

Basic

Protein structure: Results from covalent bonds between two S-containing R-groups.

Both tertiary and quaternary

Which membrane lipid does not contain a fatty acid tail?

Cholesterol

Protein structure: Results from covalent bonds formed between an amino group and a carboxyl group

Primary group

Uracil

a pyrimidine found in RNA (but not DNA); pairs with DNA adenine

Protein structure: Results from non-covalent interactions between the R-groups.

both tertiary and quaternary

A region of a protein that forms a functional component of a protein is called a

domain

Protein structure: Is also known as the protein sequence.

primary

Cytosine

pyrimidine, matches with cytosine

Protein structure: Results from covalent and non-covalent interactions between R-groups within one polypeptide chain.

tertiary