nucleic acids: A level-OCR

Questions on DNA and RNA. SCR- semi conservative replication when naming the catalysts involved in semi conservative replication your answers do not need to be preceded by DNA e.g. helicase NOT DNA helicase
Quiz by jetpwunk
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Last updated: January 23, 2021
First submittedJanuary 23, 2021
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Hint
Answer
What is the sugar in DNA?
deoxyribose
what bonds form between the sugar and phosphate group via a condensation reaction?
phosphodiester
name a pyrimidine base
thymine/cytosine
name a purine base
adenine/guanine
What is complimentary to the base adenine in DNA?
thymine
how many bonds form between A and T bases?
2
which strand (parallel or anti parallel) run 3' prime to 5' prime?
antiparallel
what does ATP stand for?
adenosine triphosphate
what is the shape DNA is twisted to form?
double helix
name the base present in RNA but not DNA
uracil
what is the sugar present in RNA?
ribose
there are 3 types of RNA; messenger, ribosomal and.....
transfer
when attempting to observe DNA, what alcohol is added to form a white precipitate?
ethanol
why is salt used when attempting to observe DNA?
joins DNA
what is the name given to DNA replication?
semi conservative replication
what catalyst is used in the unwinding of DNA?
gyrase
Hint
Answer
what catalyses the breaking of H-bonds between bases?
helicase
what catalyses the formation of the new sugar phosphate backbone?
polymerase
what is the name given to the original strands in SCR?
template
when investigating SCR, an isotope of what element was used?
nitrogen
sequences of DNA nucleotide bases that code for a polypeptide chain
gene
how many bases make up a codon?
3
what is the name given to the formation of mRNA?
transcription
In SCR 2 strands are used as templates, how many are in the formation of mRNA?
1
what is the process that occurs when mRNA reaches a ribosome?
translation
the sequence of nucleotide bases determines the sequence of what in the polypeptide?
amino acids
how many codons would a codon code if a codon could code 1 amino acid?
3
how many bases fit in a ribosome?
6
name the anticodon for the codon UAC
AUG
what bonds form between the amino acids left behind by the tRNA?
peptide
what protein is used to fold the polypeptide chain into its tertiary structure?
chaperone
what codon hates dogs?
CAT
+1
Level 73
Jan 24, 2021
How can there be an isotope of Nitrogen?
+2
Level 24
Jan 26, 2021
I believe Meselson and Stahl used N-15 as the heavier isotope; it will sink when centrifuged. Compared to the standard N-14 that will float.