Studied by 0 peoplehow many nucleotides are in 2 turns of the DNA double helix?
twenty
which DNA base pair is held together by two hydrogen bonds?
adenine and thymine
which is a soap Uracil is one example of a heterocyclic base that is a..
pyrimidine
Okasaki fragments are..
small pieces of DNA synthesized during replication
the fundamental repeating unit of organization in eukaryotic chromosome is...
the nucleosome
in nearly all DNA the molar quantity of adenine equals that of..
thymine
DNA replication in bacteria begins at a unique sequence of bases on the chromosome. This unique sequence is called the..
origin of replication
During replication the protein is synthesized
from the amino terminus --> carboxyl terminus
the shine-dalgarno sequence at the 5' end of mRNA forms a specific stable complex with..
nucleotides near the 3' end of 16S rRNA of the small ribosomal subunit
a tRNA is charged when
its specific amino acid is attached
Watson and Crick postulated that DNA exists as a...
double helix
the sequence of heterocyclic bases lined up along the backbone of the nucleic acid is vital bc this sequence..
contains the information that will the synthesis of a protein
the codon is found on ____________, and the anticodon is found on _____________
mRNA , tRNA
the synthesis in the cell of two daughter DNA strands using the original DNA as a template is called..
replication
which term does not describe the process of replication?
semi-ridiculous
termination of translation in bacteria requires..
interaction of release factors with a stop codon
a "promoter" is...
-a region of DNA to which RNA polymerase binds before transcription can begin.
-a specific sequence of DNA recognized by RNA polymerase as the start of the gene
promoter
a "promoter" is...
-more complex in eukaryotes than prokaryotes
Eukaryotic RNA polymerase II is specific for the synthesis of...
mRNA
which of the following is NOT TRUE of eukaryotic mRNA?
introns are complementary to their adjacent exons and will form hair pin structures with them
in eukaryotes, initiation of protein synthesis begins with the binding of ____________ to the small ribosomal unit.
tRNA
the following events occur during the process of transcription. The correct order of events is..
1. The RNA polymerase binds to the promoter region
2. The DNA double helix is unwound
3. Ribonucleotide triphosphates base pair with DNA
4. RNA polymerase synthesizes RNA
5. The RNA is released from the DNA and the DNA rewinds
Splicing of introns in RNA primary transcripts requires..
small nuclear ribonuceoproteins (snurps)
What statement is false concerning the RNA structure?
RNA and DNA contain the same four base units
the two strand of DNA double helix are held together by hydrogen bonds and by...
base stacking
During DNA replication, DNA polymerase synthesizes the new daughter strand in the _______________ direction
5' ---> 3'
Which of the following is the piece of mRNA produced of the DNA template ATCGATA
UAUCGAU
The overall process of mRNA directed formation of a polypeptide is called..
translation
During translation, charged tRNA molecules initially bind to the ribosome at the ___________ site.
A
Which of the following is true about the genetic code?
The base in the first position(5') of the tRNA anticodon sometimes permits base pairing with 2 or 3 different codons.
The sigma subunit of E. Coli RNA polymerase..
combines with the core enzyme to confer specific binding to a promoter.
Which of the following sequence of events is correct for the synthesis of fatty acids?
loading, condensation, reduction, dehydration, reduction, transfer
The initiation of replication, transcription, and translation in eukaryotes requires fewer imitation factors than in bacteria.
NOOOOO
The following events occur during the process of replication. The correct order of events is..
-initiation factor binds to the origin of replication
-The DNA double helix is unwound
-Primase synthesizes the RNA primer
-DNA polymerase synthesizes DNA
-DNA ligases join the Okasaki factors
Which nucleic acid reads the code of mRNA molecule and converts it into the amino acid sequence of the protein?
tRNA
which of the following terms is used to describe the relative orientation of the two strands of DNA?
anti-parallel
which of the following occur during the processing of an mRNA molecule?
introns are spliced out
a poly A tail is added to the 3' end
a cap is added to the 5' end
During translation in eukaryotes, the start codon is found by passing the mRNA over...
the anticodon of the initiating tRNA
in prokaryotes the initiation of protein synthesis begins with the binding of __________
mRNA
the 3' to 5' exonuclease activity of bacterial DNA polymerase III functions...
as a proof reader
there are _____ amino acids per turn of an alpha helix
3 & 2/3
if a segment of mRNA has the sequence AUGUUUAAAGGGCGA, it codes for which of the following peptides.
Met- Phe- Lys- Gly- Arg
nucleic acids are acidic molecules found in the nucleus of eukaryotic cells
YES
The secondary structure of DNA was elucidated by
James Watson anf Francis Crick
one subunit of the allosteric enzyme hexokinase contains 400 amino acids. The smallest mRNA that could code for this protein would contain ____________ nucleotides.
1200
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