What is the quaternary structure of a protein?
A. the sequence of amino acids
B. the initial folding into alpha helices or beta sheets
C. the folding of one amino acid chain into a functional protein
D. the interaction between multiple subunits to form one functional protein
查看答案
The primary structure of a protein is
A. the hydrogen bonds formed between amino and carboxyl groups.
B. the sequence of amino acids as dictated by the gene.
C. the association of several polypeptide chains forming and active protein.
D. the R-group interactions giving the polypeptide a specific 3D structure.
Nucleotides are joined together in a phosphodiester bond by
A. hydrolysis.
B. oxidation-reduction.
C. combustion.
D. dehydration synthesis.
One unifying property of lipids is
A. they have double bonds between carbon.
B. they are steroids and are used for communication.
C. they are hydrophobic and nonpolar.
D. they are hydrophillic and polar.
Which of the following is a monosaccharide?
A. glutamic acid
B. tyrosine
C. glucose
D. adenosine
微信支付 
支付宝支付