Module 4/5 Flashcards
DNA and RNA
are both assembled from nucleotide subunits
-5-carbon sugar
-phosphate group
-nitrogen base
What forms the sugar phosphate backbone is DNA and RNA
Each nucleotide monomer is connected by covalent bonds forming the sugar- phosphate backbone
Each linear strand of nucleotides has a ___ and ____ backbone
5’ and 3’ backbone
DNA contains
deoxyribose sugar
H-
RNA contains
ribose sugar
OH-
Which nitrogen bases are in BOTH DNA and RNA
Cytosine, Guanine, and Adenine
Which nitrogen base is found in DNA
Thymine
Which nitrogen base is found in RNA
Uracil
the three dimensional structure of proteins determines its
functional properties and enables the protein to carry out its job in the cell
What does DNA do
Store genetic information, encoded into its sequence of subunits
Encodes proteins that give structure and do work
Transmit genetic info
Polymers of nucleotides
Nucleic acids such as DNA and RNA
Nitrogen Base
A cyclic molecule that contains NITROGEN, CARBON, HYDROGEN, AND OXYGEN.
Purines
double-ringed structure
Which nitrogen bases are Purines
Adenine and Guanine
Pyrimidines
single-ringed structure
Which N-bases are pyrimidines
Thymine and Cytosine
5-Carbon sugar in DNA
Attached to the N-base
Deoxyribose
in DNA deoxyribose 2’
has a H-atom
in DNA deoxyribose 3’
has an hydroxyl group, OH-
Phosphate group make up
Consists of a central P atom, covalently bonded to four OXYGEN atoms
Phosphate group characteristics
Functional group
-polar
-negatively charged
Which C atom is the phosphate group attached to in DNA/RNA
the 5’ carbon
Phosphate group will have a NEGATIVE charge on 2 of its oxygen atoms
Why is DNA a mild ACID
DNA’s cellular pH is around 7
The free HYDROXYL GROUP attaches to the phosphorus atoms, and is IONIZED by the LOST OF A PROTON
What are monosaccharides joined by
Glycosidic Bonds
What are amino acids joined by
Peptide bonds
What are nucleotides joined by
Phosphodiester bonds
-can withstand heat, and pH changes that would break weaker bonds
Where is the phosphodiester bond in nucleotides
Vertical lines that connect the 3’ carbon of one nucleotide to the 5’ carbon of the next
C-O-P-O-C linkage is a A SERIES of covalent bonds, collectively known as a phosphodiester bond
What traces the backbone of a DNA strand
Phosphodiester bonds
Each sugar links to the phosphate group of the neighboring nucleotide by phosphodiester bonds
What gives DNA strand their directionality
The phosphodiester linkages in the DNA strand
What is directionality
Polarity
One side differs from the other