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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): Assertion (A): Breast-feeding during initial period of infant growth is recommended by doctors for bringing a healthy baby. Reason (R): Colostrum contains several antibodies absolutely essential to develop resistance in the new born baby. In the light of the above statements, choose the most appropriate answer from the options given below:
Progesterone alone or in combination with estrogen can also be used as contraceptives by females as injections or implants under their skin. When used in this manner, they:
Chargaff's rule states that in an organism:
Given below are two statements: Statement I: Transfer RNAs and ribosomal RNA do not interact with mRNA. Statement II: RNA interference (RNAi) takes place in all eukaryotic organisms as a method of cellular defence. In the light of the above statements, choose the most appropriate answer from the options given below:
What are those structures that appear as 'beads-on-string' in the chromosomes when viewed under an electron microscope?
All of the following are part of an operon except:
Types of RNA polymerase required in the nucleus for RNA synthesis:
E. coli about to replicate was placed in a medium containing radioactive thymidine for five minutes. Then, it was made to replicate in a normal medium. Which of the following observation shall be correct?
With reference to Hershey and Chase experiments, select the correct statements: A: Viruses grown in the presence of radioactive phosphorus contained radioactive DNA. B: Viruses grown on radioactive sulphur contained radioactive proteins. C: Viruses grown on radioactive phosphorus contained radioactive protein D: Viruses grown on radioactive sulphur contained radioactive DNA E: Viruses grown on radioactive protein contained radioactive DNA
PCR and Restriction Fragment Length Polymorphism are the methods for:
E. coli cells with a mutated z gene of the lac operon cannot grow in a medium containing only lactose as the source of energy because-
Match List I with List II regarding the lac operon genes and their products: List I (Genes) List II (Products) A. Gene 'a' I. Beta-galactosidase B. Gene 'y' II. Transacetylase C. Gene 'i' III. Permease D. Gene 'z' IV. Repressor protein
Identify the correct statement:
Given below are two statements: Statement I: DNA polymerases catalyse polymerisation only in one direction, that is 5' →3' Statement II: During replication of DNA, on one strand the replication is continuous while on other strand it is discontinuous. In the light of the above statements, choose the correct answer from the options given below:
If a DNA molecule is shortened by 25 base pairs, how many helical turns will be reduced from its structure?
During DNA replication, Okazaki fragments are used to elongate:
Forelimbs of cat, lizard used in walking; forelimbs of whale used in swimming and forelimbs of bats used in flying are an example of:
Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct?
The length of the DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is this DNA accommodated?
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R): Assertion (A): ATP is used at two steps in glycolysis. Reason (R): First ATP is used in converting glucose into glucose-6-phosphate and second ATP is used in conversion of fructose-6-phosphate into fructose-1-6-diphosphate. In the light of the above statements, choose the correct answer from the options given below: