Test 2 Flashcards
The amino acid sequence of a polypeptide is called the ___ structure
primary
The covalent bond that joins two amino acids is called a _______ bond.
peptide
What are the three major structural components of an amino acid?
Side chain (R group)
Amino group
Carboxyl group
What are the 4 bases of DNA?
Adenine, Thymine, Guanine, Cytosine
What are the three basic components of a nucleotide?
Phosphate group, Sugar, Base
What are the major components of the bases in a nucleotide?
Nitrogen
Single or double carbon ring
Which of the following statements is true about adenine and guanine?
They consist of two fused rings of C and N atoms.
They are purine bases.
What type of bond is responsible for the base pairing between two strands of DNA in the double helix?
Hydrogen Bond
Which are pyrimidine bases found in DNA?
Thymine
Cytosine
RNA molecules contain what type of sugar?
ribose
What base pairs are found in DNA?
Adenine-thymine
Cytosine-guanine
What does RNA contain?
Uracil
Ribose
Guanine
Cytosine
Adenine
4 Bases in RNA?
Uracil
Cytosine
Guanine
Adenine
In a DNA double helix, adenine on one strand is paired to ______ on the other strand via ______ hydrogen bonds.
thymine ; two
For a molecule to serve as the genetic material, it must meet the following key criteria:
information, replication, variation, transmission
RNA differs from DNA in that RNA contains the base ___, and does not contain the base ___
uracil, thymine
A linear DNA strand contains two ends: the 5 prime end has a free ______ group, while the 3 prime end has a free ______ group.
P, OH
Which amino acid is responsible for the formation of disulfide bonds?
Cysteine
The terminator is a site in the DNA where the ___ of a gene ends
transcription
What are the stages of transcription?
initiation, elongation, termination
transcription begins at a site in DNA called the
promoter
What is synthesized during the elongation stage of transcription
RNA
How is the 5’ end of a eukaryotic mRNA modified?
a cap is added to it
How is the 3’ end of a eukaryotic mRNA modified?
A poly A tail is added to it
introns
a segment of a DNA or RNA molecule which does not code for proteins and interrupts the sequence of genes.
exons
Coding segments of eukaryotic DNA.
what is the spliceosome complex’s function and what does it include?
A large complex made up of proteins and RNA molecules that splices RNA by removing of introns and connecting exons
Chargaff’s Rule
A=T and C=G
antiparallel configuration
The opposite arrangement of the sugar-phosphate backbones in a DNA double helix.
Connected with hydrogen bonds
Pyrimidines
cytosine, thymine, uracil
Purines
Adenine and Guanine
polymerization
putting a polymer together using a dehydration reaction
Sugar used in RNA
ribose
Sugar used in DNA
deoxyribose
What is the difference between DNA and RNA
DNA is double stranded and RNA is single stranded
DNA stores and transfers genetic information, RNA codes
what bond connects one nucelotide to the next
phosphodiester bonds
non-polar amino acids
hydrophobic
polar amino acids
hydrophilic
charged animo acids
hydrophilic
What defines the function of a protein
structure
What is a denatured protein
a protein that has lost its shape and function by being unfolded