Which of the following is the initiation codon:
1. UAG
2. AUC
3. AUG
4. CCU
The method of DNA replication in which two strands of DNA separate and synthesize new strands is called:
1. Dispersive
2. Conservative
3. Semiconservative
4. Non-conservative
Which of the following is correct about H-bonding in nucleotide:
1. A–T G–C
2. A–G T–C
3. G–T A–C
4. A–A T–T
Chargaff's rule states that in an organism:
1. | The amount of adenine (A) is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine (C). |
2. | The amount of adenine (A) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine (C). |
3. | The amount of adenine (A) is equal to that of cytosine (C) and the amount of thymine (T) is equal to that of guanine (G). |
4. | Amounts of all bases are equal. |
In the genetic code dictionary, how many codons are used to code for all the 20 essential amino acids:
1. 20
2. 64
3. 61
4. 60
What does "lac" refer to in what we call the lac operon:
1. Lactose
2. Lactase
3. Lac insect
4. The number 1,00,000
During transcription, the DNA site at which RNA polymerase binds is called:
1. Promoter
2. Regulator
3. Receptor
4. Enhancer
Which one of the following triplet codes, is correctly matched with its specificity for an amino acid in protein synthesis or as a 'start' or 'stop' codon:
1. UCG – Start
2. UUU – Stop
3. UGU – Leucine
4. UAC – Tyrosine
In Negative operon:
1. Inducer binds with repressor
2. Co-repressor does not bind with repressor
3. Corepressor binds with inducer
4. CAMP has a negative effect on the lac operon
Due to the discovery of which of the following in 1980, the evolution was termed as RNA world?
1. | m-RNA, t-RNA- rRNA synthesize proteins |
2. | In some viruses, RNA is the genetic material |
3. | RNA has enzymatic property |
4. | RNA is not found in all cells |