Description : Operon model of gene regulation and organisation of prokaryotes was proposed by: (a) Messelson and Stahl (b) Wilkins and Franklin (c) Beadle and Tatum (d) Jacob and Monod
Last Answer : Ans. ((d))
Description : Select the correct match. (a) Alec Jeffreys - Streptococcus pneumoniae (b) Alfred Hershey and - TMV Martha Chase (c) Matthew Meselson - Pisum sativum and F. Stahl (d) Francois Jacob and - Lac operon Jacques Monod
Last Answer : (a) Alec Jeffreys - Streptococcus pneumoniae
Description : Select the two correct statements out of the four (i - iv) statements given below about lac operon. (i) Glucose or galactose may bind with the repressor and inactivate it. (ii) In the absence of lactose, the repressor binds with the ... (iii) (b) (i) and (iii) (c) (ii) and (iv) (d) (i) and (ii)
Last Answer : (c) (ii) and (iv)
Last Answer : (d) Francois Jacob and - Lac operon Jacques Monod
Description : Select the correct match : (1) Alec Jeffreys – Streptococcus pneumoniae (2) Alfred Hershey and – TMV Martha Chase (3) Matthew Meselson – Pisum sativum and F. Stahl (4) Francois Jacob and – Lac operon Jacques Monod
Last Answer : (4) Francois Jacob and – Lac operon Jacques Monod
Description : The smallest RNA among the following is (A) rRNA (B) hnRNA (C) mRNA (D) tRNA
Last Answer : Answer : D
Description : The total RNA in cell tRNA constitutes (A) 1–10% (B) 10–20% (C) 30–50% (D) 50–80%
Last Answer : Answer : B
Description : Which form of RNA has a structure resembling clover leaf? (a) rRNA (b) hnRNA (c) mRNA (d) tRNA
Last Answer : (c) mRNA
Last Answer : tRNA
Description : The RNA that pick up specific amino acid from amino acid pool in the cytoplasm to ribosome during protein synthesis is called (a) rRNA (b) RNA (c) mRNA (d) tRNA.
Last Answer : a) rRNA
Description : The RNA that pick up specific amino acid from amino acid pool in the cytoplasm to ribosome during protein synthesis is called (a) rRNA (b) RNA (c) mRNA (d) tRNA
Description : What is the function of the ribosomal RNA (rRNA)?
Last Answer : A: rRNA is a component of ribosomes, which are responsible for synthesizing proteins.
Description : Where is rRNA (ribosomal RNA) located? -Biology
Last Answer : answer:
Description : What is Ribaseum RNA (rRNA) ?
Last Answer : : The RNA that acts as the main structural component of ribosomes is called ribosome RNA (rRNA) . They are synthesized from ribasomal genes. Depending on the nature of the ribosome, r-RNA can be of different types.
Description : Among the different types of RNA, which one has the highest M.W.? (A) mRNA (B) rRNA (C) yeast RNA (D) tRNA
Description : Heterogeneous nuclear RNA is the precursor of (A) mRNA (B) rRNA (C) tRNA (D) None of these
Last Answer : Answer : A
Description : Mammalian RNA polymerase III synthesises (A) rRNA (B) mRNA (C) tRNA (D) hnRNA
Last Answer : Answer : C
Description : Mammalian RNA polymerase I synthesises (A) mRNA (B) rRNA (C) tRNA (D) hnRNA
Description : Removal of RNA polymerase III from nucleoplasm will affect the synthesis of (a) tRNA (b) hnRNA (c) mRNA (d) rRNA.
Last Answer : mRNA
Description : Which of the following rRNAs acts as structural RNA as well as ribozyme in bacteria? (a) 5S rRNA (b) 18S rRNA (c) 23S rRNA (d) 5.8S rRNA
Last Answer : (a) 5S rRNA
Description : Match the following RNA polymerase with their transcribed products : 1. RNA polymerase I (i) tRNA 2. RNA polymerase II (ii) rRNA 3. RNA polymerase III (iii) hnRNA Select the correct option from the following : (a) 1-i, 2-iii, 3-ii (b) 1-i, 2-ii, 3-iii (c) 1-ii, 2-iii, 3-i (d) 1-iii, 2-ii, 3-i
Last Answer : (b) 1-i, 2-ii, 3-iii
Last Answer : (a) tRNA
Last Answer : (c) 23S rRNA
Description : What does the positive strand in double stranded RNA viruses stands for? A- rRNA B- tRNA C- .mRNA D- None of these
Last Answer : .mRNA
Description : Removal of RNA polymerase III from nucleoplasm will affect the synthesis of (1) rRNA (2) tRNA (3) hnRNA (4) mRNA
Last Answer : (2) tRNA
Description : Translation results in the formation of (A) mRNA (B) tRNA (C) rRNA (D) A protein molecule
Description : Most abundant form of RNA that constitutes 80% parts of cellular RNA
Last Answer : Ans. t-RNA
Description : Nitrogen 1. Is non-essential for the animal bodies 2. In air dilutes oxygen which, otherwise, is very active in the pure form 3. Makes oxygen soluble in blood 4. Is present in DNA and RNA The correct statements are: (a) 1 and 4 only (b) 2 and 4 only (c) 3 and 4 only (d) 1 and 2 only
Last Answer : Ans:(b)
Description : If no primer DNA was given, the following scientist could not have synthesized DNA. (A) Ochoa (B) Okazaki (C) Kornberg (D) Monod
Description : acob and Monod studied lactose metabolism in E. coli and proposed operon concept. Operon concept is applicable for (a) all prokaryotes (b) all prokaryotes and some eukaryotes (c) all prokaryotes and all eukaryotes (d) all prokaryotes and some protozoans
Last Answer : (c) all prokaryotes and all eukaryotes
Description : Which is called soluble RNA
Last Answer : Which is called soluble RNA A. tRNA B. mRNA C. rRNA D. snRNA
Description : Which one of the following statements is not true of RNA? a. RNA contains the monosaccharide ribose. b. RNA is primarily a single-stranded molecule. c. RNA has a sugar-phosphate backbone. d. RNA contains five different nucleotides.
Last Answer : d. RNA contains five different nucleotides.
Description : Peptidyl transferase activity is located in (A) Elongation factor (B) A charged tRNA molecule (C) Ribosomal protein (D) A soluble cytosolic protein
Description : (4) less soluble in blood than nitrogen at high pressure Explanation: Deep-sea divers have their oxygen supply mixed with helium in order to avoid the toxic nature of oxygen under extreme pressures. The ... blood which blocks blood flow as the diver comes to the surface of the sea from underwater.
Last Answer : The chemical bahaviour of an atom depends upon - (1) the number of protons in its nucleus (2) the number of neutrons in the nucleus (3) the number of electrons orbiting around the nucleus (4) the number of nucleons in the nucleus
Description : A nonpolar molecule is usually: w) hydrophilic x) soluble in water y) hydrophytic z) soluble in organic solvents
Last Answer : ANSWER: Z -- SOLUBLE IN ORGANIC SOLVENTS
Description : Which of the following statement(s) is/are true concerning O2 venous saturation monitoring? a. The normal saturation of mixed venous blood is 50% b. Mixed venous blood obtained ... than fully saturated blood, the difference between arterial and venous saturation corresponds to oxygen extraction
Last Answer : Answer: c, d The relationship between oxygen delivery and oxygen consumption is reflected in the amount of oxygen in venous blood. Under normal circumstances, oxygen delivery is 1000 ... and venous saturation corresponds to the oxygen extraction, hence the oxygen delivery/oxygen consumption ratio
Description : Which of the following statement(s) is/are true concerning the neuroendocrine responses to shock? a. Sympathetic nerve endings release epinephrine which is responsible for greater than 80% ... injury and sepsis d. The renin-angiotensin axis further augments the sympathetic-mediated vasoconstriction
Last Answer : Answer: c, d The neuroendocrine response to shock attempts to achieve restoration of effective blood volume, mobilization of metabolic substrates, and maintenance of central ... . Angiotensin II is an extremely effective vasoconstrictor that further augments sympathetic-mediated vasoconstriction
Description : What are the smaller repeating molecules that make up a DNA or RNA molecule called?
Last Answer : Need answer
Description : DNA or RNA segment tagged with a radioactive molecule is called (a) vector (b) probe (c) clone (d) plasmid.
Last Answer : (b) probe
Description : Retroviruses are so-named because their reverse transcriptase _____. a. reverses the flow of genetic information by stimulating information to proceed from RNA to DNA. b. reverses the normal ... the action of drugs on viruses and allows them to continue multiplying in living cells.
Last Answer : a. reverses the flow of genetic information by stimulating information to proceed from RNA to DNA.
Description : All of the following statements about tRNA are true except (A) It is synthesized as a large precursor (B) It is processed in the nucelolus (C) It has no codons or anticodons (D) Genes for rRNA are present in single copies
Description : The only molecule in the living world that can replicate itself is (a) DNA (b) RNA (c) Both DNA and RNA (d) Neither DNA nor RNA
Last Answer : Ans:(a)
Description : Synthesis of RNA molecule is terminated by a signal which is recognised by (A) α-factor (B) β-factor (C) δ-factor (D) ρ
Description : After termination of the synthesis of RNA molecule, the core enzymes separate from the DNA template. The core enzymes then recognize a promoter at which the synthesis of a new RNA molecule commences, with the assistance of (A) Rho (ρ) factor (B) δ factor (C) β factor (D) σ factor
Description : Termination of the synthesis of the RNA molecule is signaled by a sequence in the template strand of the DNA molecule, a signal that is recognized by a termination protein, the (A) Rho (ρ) factor (B) σ factor (C) δ factor (D) ε factor
Description : In RNA molecule (A) Guanine content equals cytosine (B) Adenine content equals uracil (C) Adenine content equals guanine (D) Guanine content does not necessarily equal its cytosine content.
Description : The nitrogenous base present in the RNA molecule is (A) Thymine (B) Uracil (C) Xanthine (D) Hypoxanthine
Description : In RNA molecule guanine content does not necessarily equal its cytosine content nor does its adenine content necessarily equal its uracil content since it is a (A) Single strand molecule ( ... stranded molecule (C) Double stranded helical molecule (D) Polymer of purine and pyrimidine ribonucleotides
Description : Identify the correct molecule which controls the biosynthesis of proteins in living organisms. (A) DNA (B) RNA (C) Purines (D) Pyrimidines