Our site uses cookies. Some of the cookies we use are essential for parts of the site to operate and have already been set. You may delete and block all cookies from this site, but parts of the site will not work. To find out more about cookies on this website, see our Cookie Policy
Accept
© eRevision.uk and ZigZag Education 2025
This test is run by .
Note that your final mark will not be saved in the system.

DNA and RNA GapFill

Target Level
C
Running Total
0
0%
Attempt
1 of 3

You must fill all the gaps before clicking ‘Check Answers!’

DNA and RNA are  phospholipidsnucleic acidspolysaccharidesproteins made of nucleotide monomers. Both of their functions involve carrying information: DNA contains the  nervousgeneticphotosyntheticrespiratory information of a cell, and RNA transfers this information to  mitochondriaGolgi vesiclesribosomesthe cell-surface membrane.

The basic structure of a nucleotide is:

  • a pentose sugar, which is ribose in RNA and  lactosefructosedeoxyriboseglucose in DNA
  •  an aminoa carboxyla phosphatea carbonate group
  • a nitrogen-containing base:   cytosine, guanine, thymine or uraciladenosine, cytosine, guanine or uraciladenine, cytosine, guanine or uraciladenine, cytosine, guanine or thymine in RNA, or  adenine, cytosine, guanine or uraciladenine, cytosine, guanine or thymineadenosine, cytosine, guanine or uraciladenine, cytosine, thymine or uracil in DNA.

  • RNA molecules consist of a single, relatively short polynucleotide chain. DNA molecules consist of two polynucleotide chains twisted in the shape of  an alpha helixa double helixa plaita beta-pleated sheet, with the strands held together by  metallic bondsionic bondshydrogen bondscovalent bonds between  hydrophiliccomplementaryacidicmatching base pairs.

    DNA duplicates itself using  traditionalunorthodoxsemiconservativeconservative replication, where each newly synthesised molecule has one original strand and one new strand.  DNA polymeraseDNA dividaseDNA helicaseDNA nuclease first unwinds the molecule and breaks the bonds between strands. Free nucleotides then join to the exposed bases on the  ribose sugartemplate strandDNA backbonephosphate group, and  DNA polymeraseDNA acidaseDNA nucleaseDNA helicase creates  hydrogenphosphodiesterionicglycosidic bonds between neighbouring nucleotides.

    This is your 1st attempt! You get 3 marks for each one you get right. Good luck!

    Pass Mark
    72%