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Biology Olympiad Questions

1. Genetic engineers construct recombinant DNA molecules using two enzymes: restriction endonuclease and DNA ligase. What do these two enzymes do?
A. They catalyse different reactions: restriction endonuclease joins fragments into larger molecules; DNA ligase hydrolyses DNA into smaller fragments
B. They catalyse different reactions: restriction endonuclease hydrolyses DNA into smaller fragments; DNA ligase joins fragments into larger molecules
C. They both hydrolyse DNA into smaller fragments
D. They both join fragments of DNA into larger molecules
E. They catalyse different hydrolysis reactions: restriction endonuclease hydrolyses
bacterial plasmid DNA; DNA ligase hydrolyses DNA from eukaryotic cells
2. Treatment with antibiotic drugs helps overcome many bacterial infections.
Why is penicillin toxic to many bacteria?
A. It interferes with DNA replication
B. It inhibits transcription
C. It disrupts translation
D. It blocks protein synthesis
E. It inhibits cell wall formation
3. Match each item in column A with one in column B to which it is most closely associated.
Biology Olympiad questions
4. Various forces are important in the  interactions contributing to the tertiary
structure of a protein. The figure shows  several possible interactions. Please
match the numbered interactions with  their correct names.
Biology Olympiad questions
A. Hydrogen bond
B. Hydrophobic interaction
C. Peptide bond
D. Disulphide bond
E. Ionic bond
5. The diagram represents a function  of the nucleic acid, DNA. Based on
the diagram, what is the most likely  nucleotide sequence of the  messenger RNA. Put an X in the appropriate box
Biology Olympiad questions    A        B        C       D         E
Biology Olympiad questions





Answers:
1. B. They catalyse different reactions: restriction endonuclease hydrolyses DNA into smaller fragments; DNA ligase joins fragments into larger molecules
2. E. It inhibits cell wall formation
3. A6-B7-C5-D1-E3-F2-G9-H10-I8-J4
Column A
Column B
leucoplasts Starch storage
Rough ER Immunoglobulin
genome Complete set of genetic instruction
Mitochondria Kreb cycle
Centriole Microtubule organizing center
Mesosome Bacterial DNA anchorage
Lysosome Digestive enzymes
Microfilament Cytoskeleton
Smooth ER Lipid synthesis
Golgi apparatus Protein modification and targeting
Learn more: Cell Structure and Function
4. 1A (Hydrogen bond ) – 2B (Hydrophobic interaction) – 3D(Disulphide bond ) – 4E (Ionic bond )
5.
DNA Complementary Stand messenger RNA
A T U
G C C
C G G
T A A
A T U
A T U
Ans: b) UCGAUU

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