Description : Mitochondrial DNA is (A) Circular double stranded (B) Circular single stranded (C) Linear double helix (D) None of these
Last Answer : A
Description : Which is wrong about nucleic acids? (a) DNA is single stranded in some viruses. (b) RNA is double stranded occasionally. (c) Length of one helix is 45 Å in B-DNA. (d) One turn of Z-DNA has 12 bases
Last Answer : (c) Length of one helix is 45 Å in B-DNA
Description : What is the genetic material in influenza virus? (a) Double helical DNA (b) RNA (c) Single helix DNA (d) None of these
Last Answer : (b) RNA
Last Answer : Double helix discovers DNA (Watson and Creek)
Last Answer : Watson And Creek DNA Double Helix Model Discovery Does.
Description : What are the components and structure of a DNA double helix molecule?
Last Answer : Feel Free to Answer
Description : The outside of the DNA double helix is made of alternating groups of deoxyribose sugars and _____.?
Last Answer : phosphates
Description : The structural stability of the double helix of DNA is as cribbed largely to (A) Hydrogen bonding between adjacent purine bases (B) Hydrophobic bonding between staked purine and ... Hydrogen bonding between adjacent pyrimidine bases (E) Hydrogen bonding between purine and pyrimidine bases
Last Answer : Answer : D
Description : Melting temperature of DNA is the temperature at which (A) Solid DNA becomes liquid (B) Liquid DNA evaporates (C) DNA changes from double helix into supercoiled DNA (D) Native double helical DNA is denatured
Description : DNA topoisomerase I of E. coli catalyses (A) Relaxation of negatively supercoiled DNA (B) Relaxation of positively supercoiled DNA (C) Conversion of negatively supercoiled DNA into positively supercoiled DNA (D) Conversion of double helix into supercoiled DNA
Last Answer : Answer : A
Description : Left handed double helix is present in (A) Z-DNA (B) A-DNA (C) B-DNA (D) None of these
Description : The enzyme DNA ligase (A) Introduces superhelical twists (B) Connects the end of two DNA chains (C) Unwinds the double helix (D) Synthesises RNA primers
Last Answer : Answer : B
Description : The width (helical diameter) of the double helix in B-form DNA in nm is (A) 1 (B) 2 (C) 3 (D) 4
Description : The double helix model of DNA proposed by
Last Answer : Ans. Watson and Crick (1953)
Description : Double helix model of DNA was proposed by
Description : An important step in protein synthesis is transcription. Which of the following statement(s) is/are true concerning this process? a. The first step in gene transcription involves separating the double helix ... nucleus to the cytoplasm d. Only one protein can be produced from an initial mRNA strand
Last Answer : Answer: c Transcription of a gene begins at an initiation site associated with a specific DNA sequence, termed a promoter region. After binding to DNA, the RNA polymerase opens up a short ... different proteins from the same gene. mRNA is exported from the nucleus only after processing is complete
Description : The two strands of the DNA double helix are held together by (a) Hydrogen bonds (b)C=C double bonds (c) Hydrophobic bonds (d) Peptide bonds
Last Answer : Ans:(a)
Description : If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6 × 109 bp, then the length of the DNA is approximately (a) 2.0 meters (b) 2.5 meters (c) 2.2 meters (d) 2.7 meters.
Last Answer : (b) 2.5 meters
Description : There are special proteins that help to open up DNA double helix in front of the replication fork. These proteins are (a) DNA ligase (b) DNA topoisomerase I (c) DNA gyrase (d) DNA polymerase I.
Last Answer : (c) DNA gyrase
Last Answer : (c) 2.2 meters
Description : The association of histone H1 with a nucleosome indicates that (a) DNA replication is occurring (b) the DNA is condensed into a chromatin fibre (c) the DNA double helix is exposed (d) transcription is occurring.
Last Answer : (b) the DNA is condensed into a chromatin fibre
Description : In double helix of DNA, the two DNA strands are (a) coiled around a common axis (b) coiled around each other (c) coiled differently (d) coiled over protein sheath.
Last Answer : (a) coiled around a common axis
Description : The double helix is a structural arrangement associated with _____. a. A Polysaccharide. b. The DNA Molecule. c. Glucose Molecules In Starch. d. A Protein.
Last Answer : b. The DNA Molecule.
Description : The association of histone H1 with a nucleosome indicates: (1) DNA replication is occurring. (2) The DNA is condensed into a Chromatin Fibre. (3) The DNA double helix is exposed. (4) Transcription is occurring.
Last Answer : (2) The DNA is condensed into a Chromatin Fibre.
Description : The structure of DNA is a double helix formed by two strands of DNA sequence. This sequence consists of 4 different nucleotides- Adenine, Thymine, Cytosine and Guanine. How do the nucleotides on one strand interact with the nucleotides on the second strand to maintain the helical shape of DNA?
Last Answer : Complementary Base Pairing. Adenine complementary base pairs with Thymine and Guanine complementary base pairs with Cytosine.
Description : Cylindrical windings using circular conductors, employed in transformers, are (a) single layered (b) double layered (c) multi-layered (d) none of the above
Last Answer : (c) multi-layered
Description : From base load operation and from achieving best specific energy consumption point of view, which of the following compressors are suitable? a) Single stage reciprocating compressors b) Centrifugal compressors c) Two stage reciprocating compressor d) Multi stage reciprocating compressor
Last Answer : b) Centrifugal compressors
Description : Difference between Single stage compressor and Multi stage compressor.
Last Answer : Single stage compressor Multi stage compressor. Only one cylinder for the compressor process More than one cylinder is connected in series Used in low pressure application Achieve a very ... low Suitable for light task Suitable for heavy task. It can manage large load
Description : Why are the two strands of the double helix described as being complementary?
Last Answer : Complementarity is the key to understand the stability of the double helix of DNA in the Watson-Crick model (the most stable among other conformations). DNA complementarity property is determined by ... close to unity for deoxyribose nucleic acid." (In perfect agreement with the Chargaff's rules)
Description : How has the discovery of the double helix helped us?
Last Answer : It showed how something (DNA) could code for proteins AND itself at the same time.
Description : During replication, unwinding of double helix is initiated by (A) DNAA protein (B) DnaB protein (C) DNAC protein (D) Rep protein
Description : The helix angle for double helical gears may be made up to (A) 45° (B) 60° (C) 75° (D) 90°
Last Answer : (A) 45°
Description : A 300mm diameter pipe, 5mm wall thickness is to be radiographed using the double wall single image technique. The source to be used is Iridium. Which of the following statements is true? a) ... problem with the technique d) Only the double wall, double image technique should be used with Iridium
Last Answer : c) There is no problem with the technique
Description : Are both sides of the DNA helix used for the same amino acid?
Last Answer : Typically only one strand is used as the template for messenger RNA synthesis, but some regions of DNA can encode multiple RNAs that are transcribed from opposite strands.
Last Answer : answer:
Last Answer : DNA Molecule Bi - helix Of structure Father Watson, Creek
Description : In DNA helix, cytosine is paired with guanine by
Last Answer : In DNA helix, cytosine is paired with guanine by A. covalent bond B. phosphate bond C. three hydrogen bonds D. two hydrogen bonds
Description : $ DNA helix to 20Å wide. One complete turn of DNA is 34Å long.
Last Answer : $ DNA helix to 20Å wide. One complete turn of DNA is 34Å long. A. If both As and R are correct and R ... , R is wrong D. If both As and R are wrong.
Description : Proteins which interact with DNA and affect the rate of transcription possess the following structural motif: (A) Helix-turn-helix motif (B) Zinc finger motif (C) Leucine zipper motif (D) All of these
Description : Ten base pairs are present in one turn of the helix in (A) A-DNA (B) B-DNA (C) C-DNA (D) Z-DNA
Description : The enzyme which catalyzes the unwinding of DNA helix during replication is: (1) Primase (2) Topoisomerase (3) Helicase (4) DNA polymerase
Last Answer : (3) Helicase Explanation: A type of helicase enzyme called DNA helicase catalyzes the unwinding of the DNA helix at the time of replication. It uses the energy released through hydrolysis of ATP ( ... The enzyme is needed to separate the two strands of DNA also during transcription and DNA repair.
Description : Name the enzyme that facilitates opening of DNA helix during transcription. (a) DNA ligase (b) DNA helicase (c) DNA polymerase (d) RNA polymerase
Last Answer : b) DNA helicase
Description : One turn of the helix in a B-form DNA is approximately (a) 2 nm (b) 20 nm (c) 0.34 nm (d) 3.4 nm.
Last Answer : ) 3.4 nm.
Description : The enzyme which catalyzes the unwinding of DNA helix during replication is: (1) Primase (2) Topoisomerase (3) Helicase (4) DNApolymerase
Last Answer : C option is the answer
Description : An organic compound (A) has a molecular weight 78 and an empirical formula CH. (A) is resistant to attack by oxidizing agents but undergoes substitution and addition reactions. X-ray analysis shows that the ... suggests that compound (A) is (a) Benzene (b) Cyclohexane (c) Toluene (d) n-Hexane
Last Answer : Benzene
Description : The mitochondrial DNA is (A) Like the nuclear DNA in structure (B) Single stranded, linear (C) Double stranded, circular (D) Single stranded, circular
Last Answer : Answer : C
Description : A plasmid is a (A) Single stranded linear DNA (B) Single stranded circular DNA (C) Double stranded linear DNA (D) Double stranded circular DNA
Description : Restriction endonucleases split (A) RNA (B) Single stranded DNA (C) Double stranded DNA (D) DNA-RNA hybrids