This quiz has a mixture of SL and HL questions
1. The universal nature of the genetic code demonstrates ...
  • A. viruses are non-living particles
  • B. all life forms have common ancestry
  • C. absence of mutations
  • D. conservative replication of DNA

Q2-5: These questions are about the structure of DNA.

DNA structure
Zephrys - CC-BY-SA 3.0

2. In the image above, what makes up the backbone ?
  • A. Deoxyribose
  • B. Deoxyribose and phosphate
  • C. Bases
  • D. Ribose and phosphate
3. Base pairs make up the ‘rungs of the ladder’. Which of the following would not be found in DNA?
  • A.  Adenine – Thymine
  • B.  Guanine – Cytosine
  • C.  Uracil – Adenine
  • D.  Thymine – Adenine
4. The bases are joined to ...
  • A. phosphorous
  • B. oxygen
  • C. hydrogen
  • D. carbon
5. The complementary bases are linked by what type of bond?
  • A. Polar
  • B. Hydrogen
  • C. Covalent
  • D. Peptide
AHL questions:  

6. Which of these rows best descibes the following bases?

  
  Purine  Pyrimidine Complementary to each other Number of hydrogen bonds between bases
A Adenine  Thymine No 2
B Thymine Adenine  Yes 3
C Guanine  Cytosine  Yes  3
D Cytosine  Guanine No 2
7. A ribosome carrying out translation will move along the mRNA molecule in which direction?
  • A. 3’ rightArrow 5’    
  • B. 3’ rightArrow 3’
  • C. 5’ rightArrow 3’
  • D. 5’ rightArrow 5’

8. Alfred Hershey and Martha Chase performed an experiment using T2 bacteriophages and E.coli to try and identify the genetic material. The data obtained following bacterial infection with T2 phages and centrifugation showed:

Radioactive isotope used Pellet (%) Supernatant (%)
32P 70 30
35S 20 80

What can be concluded from this experiment?
  • A. All T2 bacteriophages were separated from the bacteria during blending
  • B. Viral DNA was found inside bacteria
  • C. Bacterial protein was found inside viruses
  • D. DNA was mainly found outside bacteria
9. Which most accurately describes the structure of a nucleosome? nucleosome image Zephrys - CC-BY-SA 3.0
  • A. DNA wrapped around a core of RNA molecules and histone proteins
  • B. RNA wrapped around a core of DNA molecules and histone proteins
  • C. DNA wrapped around a core of four history proteins
  • D. DNA wrapped a core of eight histone proteins

10. What did Erwin Chargaff's data on the composition of DNA in different organisms show?

I. The ratio of the four bases was not 1:1:1:1 as suggested by the tetranucleotide hypothesis
II. DNA contains roughly equal amounts of adenine and guanine compared to cytosine and thymine
III. Purines are single ring bases and pyrimidines are double ring bases
IV. DNA has roughly equal numbers of adenine to thymine bases, and cytosine to guanine bases.
  • A. I only
  • B. I, II and IV only
  • C. I and III only
  • D. II and IV only
Background Image by Tim Tim
CC-BY-SA 4.0