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 : 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 : Restriction endonucleases split (A) RNA (B) Single stranded DNA (C) Double stranded DNA (D) DNA-RNA hybrids
Last Answer : Answer : C
Description : Actinomycin D binds to (A) Double stranded DNA (B) Single stranded DNA (C) Single stranded RNA (D) DNA-RNA hybrid
Last Answer : Answer : A
Description : Restriction endonucleases recognize and cut a certain sequence of (A) Single stranded DNA (B) Double stranded DNA (C) RNA (D) Protein
Last Answer : Answer : B
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 : 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 : 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 : 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 : AIDS virus has : (1) single-stranded RNA (2) double-stranded RNA (3) single-stranded DNA (4) double-stranded DNA
Last Answer : single-stranded 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
Description : What is true about viruses without exception? (1) They contain a core of RNA (2) They can infect bacteria (3) They cannot produce antibodies (4) They can multiply only in host cells
Last Answer : (4) They can multiply only in host cells Explanation: Viruses do not contain enzymes for energy production or protein synthesis. For a virus to multiply, it must invade a host cell and direct the host ... proteins, and copies of its nucleic acid, using the host cell's ATP to power the reactions.
Last Answer : They can multiply only in host cells
Description : Which one of the folLowing statements is NOT true of the influenza viruses? a. They have a segmented genome. b. The genome is double-stranded DNA. c. The viruses have an envelope. d. There are three types of flu viruses
Last Answer : b. The genome is double-stranded DNA.
Description : .Viruses possess (a) ribosomes to synthesize protein (b) organelle for its vital mechanism (c) either DNA or RNA (d) none of these.
Last Answer : (c) either DNA or RNA
Description : Which one of the following statements about viruses is correct? (a) Viruses possess their own metabolic system. (b) All viruses contain both RNA and DNA. (c) Viruses are obligate parasites. (d) Nucleic acid of viruses is known as capsid.
Last Answer : (c) Viruses are obligate parasites.
Description : During transcription, do both strands of DNA get transcribed into a double stranded RNA molecule?
Last Answer : No. RNA is single stranded and is transcribed from only one of the DNA strands. DNA replication does make copies of both strands.
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 : The mitochondrial DNA is (A) Like the nuclear DNA in structure (B) Single stranded, linear (C) Double stranded, circular (D) Single stranded, circular
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
Last Answer : Answer : D
Description : S1 nuclease hydrolyses (A) DNA of somatic cells (B) DNA of sperms (C) Any double stranded DNA (D) Any single stranded DNA
Description : Mitochondrial DNA is (A) Circular double stranded (B) Circular single stranded (C) Linear double helix (D) None of these
Last Answer : A
Description : A DNA with unequal nitrogen bases would most probably be (a) single stranded (b) double stranded (c) triple stranded (d) four stranded
Last Answer : (a) single stranded
Description : The DNA of E.coli is (a) double stranded and linear (b) double stranded and circular (c) single stranded and linear (d) single stranded and circular.
Last Answer : (b) double stranded and circular
Description : Crocodile and penguin are similar to whale and dogfish in which one of the following features? (a) Possess a solid single stranded central nervous system (b) Lay eggs and guard them till they hatch (c) Possess bony skeleton (d) Have gill slits at some stage
Last Answer : (d) Have gill slits at some stage
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 : Viruses have (a) DNA enclosed in a protein coat (b) prokaryotic nucleus (c) single chromosome (d) both DNA and RNA.
Last Answer : (a) DNA enclosed in a protein coat
Description : State whether the following statement is true. i) A macro virus is platform independent. ii) Macro viruses infect documents, not executable portions of code. A) i-only B) ii-only C) Both i and ii D) Non i and ii
Last Answer : D) Non i and ii
Description : Is RNA is usually single-stranded.?
Last Answer : During transcription, DNA is used as a template to make a copyof single-stranded RNA. only one of the two DNA strands is used asa template for RNA synthesis. therefore only one complementarystrand of RNA is usually made
Description : Which of the following is correct regarding AIDS causative agent HIV? (a) HIV is enveloped virus containing one molecule of single-stranded RNA and one molecule of reverse transcriptase. (b) HIV ... ) HIV is unenveloped retrovirus. (d) HIV does not escape but attacks the acquired immune response
Last Answer : (d) HIV does not escape but attacks the acquired immune response.
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 : If the total amount of adenine and thymine in a double stranded DNA is 45% the amount of guanine this DNA will be `:`
Last Answer : If the total amount of adenine and thymine in a double stranded DNA is 45% the amount of guanine this DNA will be ` ... ` B. `27.5%` C. `45%` D. `55%`
Description : In sticky ends produced by restriction endonucleases (A) The 2 strands of DNA are joined to each other (B) The DNA strands stick to the restriction endonuclease (C) The ends of a double stranded fragment are overlapping (D) The ends of a double stranded fragment are non overlapping
Description : All of the following statements about restriction endonucleases are true except: (A) They are present in bacteria (B) They act on double stranded DNA (C) They recognize palindromic sequences (D) They always produce sticky ends
Description : In sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are (a) G 17%, A 33%, T 33% (b) G 8.5%, A 50%, T 24.5% (c) G 34%, A 24.5%, T 24.5% (d) G 17%, A 16.5%, T 32.5%.
Last Answer : (a) G 17%, A 33%, T 33%
Description : An F-cell is unable to initiate conjugation because it lacks a. Double-Stranded DNA. b. A Prophase. c. An F Factor. d. DNA polymerase
Last Answer : c. An F Factor.
Description : n lysogeny, A- a bacteriophage transfers bacterial DNA B- bacteria take up double stranded DNA from the environment C- DNA-degrading enzymes in the extracellular medium would stop the process D- a bacteriophage genome is integrated into the bacterial genome
Last Answer : a bacteriophage genome is integrated into the bacterial genome
Description : If a double stranded DNA has 20% Thymine, the percentage of Guanine in the DNA a) 30% b) 10% c) 90% d) 40%
Last Answer : a) 30%
Description : The only correct statement about oncoviruses is (A) All the oncoviruses are RNA viruses (B) Reverse transcriptase is present in all oncoviruses (C) Viral oncogenes are identical to human protooncogens (D) Both DNA and RNA viruses can be oncoviruses
Description : .Viruses that infect bacteria multiply and cause their lysis, are called (a) lysozymes (b) lipolytic (c) lytic (d) lysogenic
Last Answer : (c) lytic
Description : _______viruses infect executable program files: a) File Infector Viruses b) Macro Viruses c) Multi Partite Viruses d) None of These
Last Answer : a) File Infector Viruses
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 : Template-directed DNA synthesis occurs in all the following except (A) The replication fork (B) Polymerase chain reaction (C) Growth of RNA tumor viruses (D) Expression of oncogenes
Description : Template-directed DNA synthesis occurs in all the following except (A) The replication fork (B) Polymerase chain reaction (C) Growth of RNA tumor viruses (D) Expression of oneogenes
Description : All of the following statements about RNA-dependent DNA polymerase are true except: (A) It synthesizes DNA using RNA as a template (B) It is also known as reverse transcriptase (C) It synthesizes DNA in 5’→3’ direction (D) It is present in all the viruses
Description : Some viruses have RNA but no DNA. This would indicate that – (1) these viruses cannot replicate (2) these viruses have no heritable information (3) RNA transmits the hereditary information in these viruses (4) their nucleic acids can be crystallised
Last Answer : (2) these viruses have no heritable information Explanation: DNA is an informational molecule encoding the genetic instructions Along with RNA and proteins, it is one of the three major macromolecules that are ... guanine, adenine, thymine, and cytosine) recorded using the letters G, A, T, and C.
Description : Which of the following is true? (1) DNA is the genetic material in most of the organism (2) RNA is the genetic material in most viruses and bacteria (3) DNA is the genetic material in all the viruses (4) RNA is the genetic material in all the viruses
Last Answer : (1) DNA is the genetic material in most of the organism Explanation: Deoxyribonucleic acid (DNA) molecules are informational molecules encoding the genetic instructions used in the development and functioning of all ... letters. G, A, T, and C. DNA is well-suited for biological information storage.