biology Questions

QUESTION: In the lac operon, the z gene codes for :

QUESTION: Which of the following statements are not true regarding restriction endonucleases? A. They are called molecular scissors. B. These are the enzymes responsible for restricting the growth of bacteriophages in E. coli. C. They cut the DNA onl

QUESTION: Arrange the following in the correct developmental sequence related to microsporogenesis : A. Microspore tetrads B. Sporogenous tissue C. Pollen grains D. Pollen mother cells Choose the correct answer from the options given below :

QUESTION: The enzyme required for carboxylation in the Calvin cycle is :

QUESTION: Alpha-helix is found in which level of protein structure?

QUESTION: Since the origin and diversification of life on Earth, there have been five episodes of mass extinction of species. How is the sixth extinction, which is in progress, different from the previous episodes?

QUESTION: In racemose inflorescence, ________.

QUESTION: Match List I with List II : List I (Growth Regulator) A. 2,4-D B. GA₃ C. Kinetin D. ABA List II (Function/Effect) I. Brewing industry II. Stimulation of stomatal closure III. Herbicide IV. Nutrient mobilisation Choose the correct answer fro

QUESTION: Which of the following statements are true with reference to the sex-determination in honeybees? A. An offspring formed from the union of a sperm and an egg, develops as a female (queen or worker). B. An unfertilized egg develops as a male

QUESTION: Exploring molecular, genetic and species-level diversity for products of economic importance is called :

QUESTION: Match List I with List II : A. Genetically modified organism B. Thermostable DNA polymerase Ti plasmid C. pBR322 D. pBR322 List II I. Agrobacterium tumefaciens II. Bt cotton III. Thermus aquaticus IV. Escherichia coli Choose the correct ans