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WorksheetsIB Nucleic acids
Total questions: 15
Worksheet time: 10mins
In which direction does DNA replication occur?
3'->5'
3'->3'
5'->3'
5'->5'
In the Hershey and Chase experiment the presence of an isotope of which element in the bacteria in the pellet after centrifugation indicated that DNA was the genetic material
Sulphur
Carbon
Nitrogen
Phosphorous
Identify the enzyme that adds nucleotides in a 5'->3' direction on the leading strand.
DNA gyrase
DNA polymerase III
DNA polymerase I
DNA Primase
State the enzyme that uncoils the DNA double helix
(a)
Identify the enzyme that adds a short length of RNA to a template strand of DNA
DNA Ligase
DNA polymerase I
DNA gyrase
DNA primase
State the term for the newly synthesised DNA formed between RNA promers on th elagging strand
(a)
In eukaryotes the coding sequence on DNA is interrupted by non-coding sequences. Identify the term for the non coding sequences.
Introns
Promoter
Exons
Histones
How many tandem repeats are there in the sequence: GATAGATAGATAGATAGATA
2
4
5
20
Identify the repetitive base sequences found at the end of chromosomes that are not replicated
Exons
Codons
Terminator
Telomeres
There are genes for tRNA and rRNA
True
False
Identify the process that can be used to separate fragments of DNA accoring to their size and charge.
PCR
Gel electrophoresis
Bioinformatics
Autoradiography
State the process that involves nucleosomes linking up and pulling together to tightly package DNA.
(a)
State the term for the proteins around which DNA is wrapped in ekaryotic chromosomes
(a)
How many core histone proteins are there in a nucleosome
1
2
4
8
What term describes the two strands in a DNA molecule running in opposite directions?
(a)
