W, X and Y are the intermediates in a biochemical pathway as shown below:
$$S \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \to W \to X \to Y \to Z$$
Mutants auxotrophic for Z are found in four different complementation groups, namely Z1, Z2, Z3 and Z4. The growth of these mutants on media supplemented with W, X, Y or Z is shown below (Yes: growth observed: No: growth not observed):
Mutants | Media Supplemented with Mutants | |||
W | X | Y | Z | |
Z1 | No | No | Yes | Yes |
Z2 | No | Yes | Yes | Yes |
Z3 | No | No | No | Yes |
Z4 | Yes | Yes | Yes | Yes |
What is the order of the four complementation groups in terms of the step they block?
A. \[S \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \xrightarrow{{Z1}}W\xrightarrow{{Z2}}X\xrightarrow{{Z3}}Y\xrightarrow{{Z4}}Z\]
B. \[S \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \xrightarrow{{Z4}}W\xrightarrow{{Z2}}X\xrightarrow{{Z1}}Y\xrightarrow{{Z3}}Z\]
C. \[S \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \xrightarrow{{Z3}}W\xrightarrow{{Z1}}X\xrightarrow{{Z2}}Y\xrightarrow{{Z4}}Z\]
D. \[S \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \xrightarrow{{Z4}}W\xrightarrow{{Z1}}X\xrightarrow{{Z2}}Y\xrightarrow{{Z3}}Z\]
Answer: Option B
Expression of hundreds of different genes in DNA microarray technology is monitored by using
A. Radioactive probe
B. Visible chromogenic probe
C. UV absorbing probe
D. Fluorescent probe
A. Transcriptionally controlled
B. Post-transcriptionally controlled
C. Translationally controlled
D. Post-translationally controlled
Which one of the following techniques/tools is not used for inserting a foreign gene into a cell?
A. DNA microarray
B. Electroporation
C. Gene gun
D. Microinjection
A. Polymerase chain reaction
B. DNA microarray
C. Northern hybridization
D. Southern hybridization
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