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Jacob and Monod studied lactose metabolism in E. Coli and proposed the Operon concept. The Operon concept is applicable to:
Match the placental types Column-I with their examples Column-II.
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:
Which one of the following experiments of Frederick Griffith resulted in the discovery of bacterial transformation?
Match the following contraceptive methods (Column-I) with their correct categories (Column-II): Column I Column II A. Coitus Interruptus (i) Natural methods B. LNG- 20 (ii) IUDs C. Diaphragms (iii) Barrier Methods D. Multiload 375 (iv) Surgical Methods E. Saheli (v) Oral Contraceptives <br>
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 four methods (A-D) and their modes of action (1-4) in achieving contraception. Select their correct matching from the four options that follow:<br><br>Column I<br>A. The Pill<br>B. Condom<br>C. Vasectomy<br>D. Copper T<br><br>Column II<br>1. Prevents sperms reaching cervix<br>2. Suppress sperm motility<br>3. Prevents ovulation<br>4. Semen contains no sperms
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:
Pick out the correct statements: I: Haemophilia is a sex-linked recessive disease. II: Down’s syndrome is due to aneuploidy. III: Phenylketonuria is an autosomal recessive gene disorder. IV: Sickle cell anaemia is an X-linked recessive gene disorder
What are those structures that appear as 'beads-on-string' in the chromosomes when viewed under an electron microscope?
Match the Assisted Reproductive Technologies (ARTs) with their correct descriptions: I. Collected gametes are made to form the zygote in the laboratory. II. Zygote or early embryo with upto 8 blastomeres is transferred into the oviduct. III. Zygote with more than 8 blastomeres is transferred into the uterus. IV. Fusion of gametes within the female. V. Transfer of ovum from a donor to the oviduct of the recipient. VI. Sperm is injected into the ovum in-vitro.
All of the following are part of an operon except:
Bicarpellary ovary with obliquely placed septum is seen in:
Types of RNA polymerase required in the nucleus for RNA synthesis:
Given below are two statements: Statement I: In the RNA world, RNA is considered the first genetic material evolved to carry out essential life processes. RNA acts as a genetic material and also as a catalyst for some important biochemical reactions in living systems. Being reactive, RNA is unstable. Statement II: DNA evolved from RNA and is a more stable genetic material. Its double helical strands being complementary, resist changes by evolving repairing mechanism. In light of the above statements, choose the most appropriate answer from the options given below:
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?
Match the Assisted Reproductive Technologies (ARTs) with their correct descriptions: I. Collected gametes are made to form the zygote in the laboratory. II. Zygote or early embryo with upto 8 blastomeres is transferred into the oviduct. III. Zygote with more than 8 blastomeres is transferred into the uterus. IV. Fusion of gametes within the female. V. Transfer of ovum from a donor to the oviduct of the recipient. VI. Sperm is injected into the ovum in-vitro.
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
Which of the following statements about inclusion bodies is incorrect?