Q. No.How many of the following pairs are correctly matched regarding key contributions to deciphering the genetic code?
1. None are correct.
2. One pair is correct.
3. Two pairs are correct.
4. All three pairs are correct.
| Scientist | Contribution |
| Har Gobind Khorana | Developed chemical methods for synthesizing RNA with defined base sequences. |
| Marshall Nirenberg | Developed a cell-free system for protein synthesis that helped in decoding the genetic code. |
| Severo Ochoa | Proved that DNA, not proteins, is the genetic material. |
1. None are correct.
2. One pair is correct.
3. Two pairs are correct.
4. All three pairs are correct.
Subtopic: Genetic Code |
90%
Level 1: 80%+
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The signal to start translation is the initiator codon, usually AUG, the codon for
1. tyrosine
2. methionine
3. leucine
4. no amino acid
1. tyrosine
2. methionine
3. leucine
4. no amino acid
Subtopic: Genetic Code |
93%
Level 1: 80%+
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Subtopic: Genetic Code |
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Which of the following is not the characteristic feature of genetic code?
| 1. | The codon is triplet |
| 2. | The code is nearly universal |
| 3. | The code has punctuations |
| 4. | Some amino acids are coded by more than one codon, hence the code is degenerate |
Subtopic: Genetic Code |
89%
Level 1: 80%+
NEET - 2024
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If we say that the genetic code is ‘degenerate’, it essentially means:
1. Some amino acids are coded by more than one codon.
2. The codon is read in mRNA in a contiguous fashion.
3. The code is nearly universal.
4. AUG has dual functions.
1. Some amino acids are coded by more than one codon.
2. The codon is read in mRNA in a contiguous fashion.
3. The code is nearly universal.
4. AUG has dual functions.
Subtopic: Genetic Code |
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What is not true for genetic code?
1. A codon in mRNA is read in non-contiguous fashion
2. It is nearly universal
3. It is degenerate
4. It is unambiguous
Subtopic: Genetic Code: I | Genetic Code: II | Genetic Code |
85%
Level 1: 80%+
AIPMT - 2009
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Subtopic: Genetic Code |
82%
Level 1: 80%+
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| Assertion(A): | The genetic code is degenerate. |
| Reason(R): | Most amino acids are coded by more than one codon. |
| 1. | Both (A) and (R) are True and (R) is correct explanation of (A) |
| 2. | Both (A) and (R) are True and (R) is not correct explanation of (A) |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Genetic Code |
82%
Level 1: 80%+
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Identify the incorrect match:
| mRNA codon | Amino acid | |
| 1. | AUG | Methionine |
| 2. | GGG | Glycine |
| 3. | UGA | Tryptophan |
| 4. | UAG | None; it is a stop codon |
Subtopic: Genetic Code |
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Match each homopolymer codon in Column-I with its corresponding amino acid in Column-II and select the best match from the codes given:
Codes:
| Column-I | Column-II | ||
| A. | UUU | P. | Phenylalanine |
| B. | AAA | Q. | Lysine |
| C. | CCC | R. | Proline |
| D. | GGG | S. | Glycine |
| A | B | C | D | |
| 1 | P | Q | R | S |
| 2 | Q | P | S | R |
| 3 | R | S | P | Q |
| 4 | S | P | Q | R |
Subtopic: Genetic Code |
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Level 1: 80%+
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