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
Last Answer : Answer : A
Description : Double helical structure model of the DNA was proposed by (A) Pauling and Corey (B) Peter Mitchell (C) Watson and Crick (D) King and Wooten
Last Answer : Answer : C
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
Description : A copper containing oxidase is (A) Cytochrome oxidase (B) Flavin mononucleotide (C) Flavin adenine dinucleotide (D) Xanthine oxidase
Description : Vitamins that function as dinucleotide derivatives include all the following except (A) Thiamine (B) Niacin (C) Nicotinate (D) Vitamin B2
Description : Transmethylation of guanido acetic acid gives (A) Creatine phosphate (B) Creatinine (C) Choline (D) n-methyl nicotinamide
Description : What is the full form of DNA? (1) Diribo nucleic acid (2) Di nucleic acid (3) Dual nitrogen acid (4) Deoxyribonucleic acid
Last Answer : (4) Deoxyribonucleic acid Explanation: DNA stands for Deoxyribo nucleic acid. It is a nucleic acid that carries the genetic instructions used in the growth development, functioning and reproduction of all known living organisms and many viruses.
Description : DNA stands for: a) Deoxyribonucleic Acid b) Deep Nuclear Acid c) Dependant Nucleic Attributes d) Dem New Adidas
Last Answer : a) Deoxyribonucleic Acid
Description : True or false? DNA is an abbreviation for ‘Deoxyribonucleic acid’
Last Answer : True
Description : Which is not consistent with double helical structure of DNA? (a) A = T, C = G (b) Density of DNA decreases on heating. (c) A + T/C + G is not constant. (d) Both (a) and (b)
Last Answer : (c) A + T/C + G is not constant
Description : The double helical structure of DNA is held together by (a) sulfur-sulfur linkages (b) peptide bonding (c) hydrogen bonding (d) glycosidic bonds
Last Answer : hydrogen bonding
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 : 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
Last Answer : Answer : D
Description : For unwinding of double helical DNA, (A) Energy is provided by ATP (B) Energy is provided by GTP (C) Energy can be provided by either ATP or GTP (D) No energy is required
Description : The width (helical diameter) of the double helix in B-form DNA in nm is (A) 1 (B) 2 (C) 3 (D) 4
Last Answer : Answer : B
Description : Progressive transmethylation of ethanolamine gives (A) Creatinine (B) Choline (C) Methionine (D) N-methyl nicotinamide
Description : Which ot the following vitamin is involved in coenzyme function in transaminations? (A) Nicotinamide (B) Pyridoxine (C) Thiamine (D) Riboflavin
Description : The following vitamin is involved in coenzyme function in transaminations: (A) Nicotinamide (B) Pyridoxine (C) Thiamine (D) Riboflavin
Description : The enzymes with which nicotinamide act as coenzyme are (A) Dehydrogenases (B) Transaminases (C) Decarboxylases (D) Carboxylases
Description : Tetra hydroglolate can be freed from N5 methyl tetrahydrofolate only by (A) Nor epinephrine (B) Ethanol amine (C) Nicotinamide (D) Vitamin B12
Description : What is true of nicotinic acid as well as nicotinamide: A. Both possess vitamin B3 activity B. Both cause cutaneous vasodilatation C. Both lower plasma triglyceride and VLDL levels D. Both cause hyperglycaemia after prolonged medication
Last Answer : A. Both possess vitamin B3 activity
Description : Which of the following prevents bleeding of gums ? (1) Ascorbic acid (2) Vitamin B (3) Nicotinamide (4) Thiamine
Last Answer : Ascorbic acid
Description : Restriction endonucleases split (A) RNA (B) Single stranded DNA (C) Double stranded DNA (D) DNA-RNA hybrids
Description : Actinomycin D binds to (A) Double stranded DNA (B) Single stranded DNA (C) Single stranded RNA (D) DNA-RNA hybrid
Description : Restriction endonucleases recognize and cut a certain sequence of (A) Single stranded DNA (B) Double stranded DNA (C) RNA (D) Protein
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
Description : 1.7 m double helical DNA will have base pairs
Last Answer : 1.7 m double helical DNA will have base pairs A. `3.4xx10^(9)` B. `5xx10^(9)` C. `1.7xx10^(9)` D. `1.7xx10^(5)`
Description : When a helical spring is cut into two halves, the stiffness of each half spring will be, (A) Same as original spring (B) Double of original spring (C) Half of original spring (D) One fourth of original spring
Last Answer : (B) Double of original spring
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 close –coiled helical spring is cut into two equal parts. The stiffness of the resulting springs will be (a) same (b) double (c) half (d) One-fourth
Last Answer : (b) double
Description : Protection against obesity - How promising is nicotinamide riboside, a substance found in milk?
Last Answer : Wow! Intriguing. I would be very interested to see if high doses were OK and without side effects.
Description : Which of the following pair is characterised by swollen lips, thick pigmented skin of hands and legs and irritability? (a) Thiamine – Beri-beri (b) Protein – Kwashiorkor (c) Nicotinamide – Pellagra (d) Iodine – Goitre
Last Answer : (c) Nicotinamide – Pellagra
Description : Which ot the following vitamin is involved in coenzyme function in tansaminations? (A) Nicotinamide (B) Pyridoxine (C) Thiamine (D) Riboflavin
Last Answer : B) Pyridoxine
Description : Which one is the matching pair characterized by pigmented skin of hands, legs and irritability (C.B.S.E.93) (a) Iodine-Goitre (b) Nicotinamide-Pellagra (c) Thiamine-Beri-beri (d) Protein-Kwashiorkor
Last Answer : (b) Nicotinamide-Pellagra
Description : Whcih of the following compound is present in RNA but absent from DNA? (A) Thymine (B) Cytosine (C) Uracil (D) Guanine
Description : Anticodon region is an important part of the structure of (A) r-RNA (B) t-RNA (C) m-RNA (D) z-DNA
Description : Leucine zipper motif is seen in some helical proteins when leucine residues appear at every (A) 3rd position (B) 5th position (C) 7th position (D) 9th position
Description : The mitochondrial DNA is (A) Like the nuclear DNA in structure (B) Single stranded, linear (C) Double stranded, circular (D) Single stranded, circular
Description : ? X l74 has: (a) Single stranded DNA (b) Single stranded RNA (c) Double stranded RNA (d) Double stranded DNA
Last Answer : Ans. ((a))
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 : Most viruses that infect plant possess (a) single-stranded DNA (b) single-stranded RNA (c) double-stranded DNA and RNA (d) double - stranded RNA only
Last Answer : Ans:(b)
Description : AIDS virus has – (1) single-stranded RNA (2) double-stranded RNA (3) single-stranded DNA (4) double-stranded DNA
Last Answer : (1) single-stranded RNA Explanation: AIDS viruses have single stranded RNA. It is composed of two copies of positive single-stranded RNA that codes for the virus's nine genes enclosed by a ... 2,000 copies of the viral protein. The single-stranded RNA is tightly bound to nucleocapsid proteins.
Description : AIDS virus is----------- A. Single-stranded RNA (Answer) B. Single-stranded DNA C. Double-stranded RNA D. Double-stranded DNA
Last Answer : A. Single-stranded RNA (Answer)
Description : Human immuno deficiency virus (HIV) has a protein coat and a genetic material which is (a) double stranded RNA (b) double stranded DNA (c) single stranded DNA (d) single stranded RNA
Last Answer : (d) single stranded RNA.
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 : Tobacco mosaic virus (TMV) genes are (a) single stranded RNA (b) double stranded DNA (c) proteinaceous (d) double stranded RNA.
Last Answer : (a) single stranded RNA
Description : Genophore/bacterial genome or nucleoid is made of (a) histones and non-histones (b) RNA and histones (c) a single double stranded DNA (d) a single stranded DNA.
Last Answer : c) a single double stranded DNA
Description : The hereditary material present in the bacterium E.coli is (a) single-stranded DNA (b) double-stranded DNA (c) DNA (d) RNA.
Last Answer : (b) double-stranded DNA
Description : An RNA virus genome in the form of messenger RNA is referred to as a a. + strand RNA. b. double-stranded RNA c. – strand RNa d. Reverse strand RNA.
Last Answer : a. + strand RNA.
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