1. Genetic engineers construct recombinant DNA molecules using two enzymes: restriction endonuclease and DNA ligase. What do these two enzymes do?
Why is penicillin toxic to many bacteria?
A B C D E
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
Learn more: Cell Structure and Function
4. 1A (Hydrogen bond ) – 2B (Hydrophobic interaction) – 3D(Disulphide bond ) – 4E (Ionic bond )
5.
Ans: b) UCGAUU
A. They catalyse different reactions: restriction endonuclease joins fragments into larger molecules; DNA ligase hydrolyses DNA into smaller fragments2. Treatment with antibiotic drugs helps overcome many bacterial infections.
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
Why is penicillin toxic to many bacteria?
A. It interferes with DNA replication3. Match each item in column A with one in column B to which it is most closely associated.
B. It inhibits transcription
C. It disrupts translation
D. It blocks protein synthesis
E. It inhibits cell wall formation
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.
structure of a protein. The figure shows several possible interactions. Please
match the numbered interactions with their correct names.
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
the diagram, what is the most likely nucleotide sequence of the messenger RNA. Put an X in the appropriate box
A B C D E
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 |
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 |
