Case Based Questions Test: Molecular Basis of Inheritance - 1 - NEET MCQ
15 Questions MCQ Test Biology Class 12 - Case Based Questions Test: Molecular Basis of Inheritance - 1
Read the following text and answer the following questions on the basis of the same :
DNA, a long polymer of deoxyribonucleotide. Altmann and these substances to be acidic hence he named nucleic acid. The basic unit of DNA is a nucleotide which has three components—a nitrogenous base, a pentose sugar (deoxyribose) and a phosphate group. There are two types of nitrogenous bases in DNA, Purine and Pyrimidine. J. Watson and F. Crick proposed a double helix model for the structure of DNA. There are four types of DNA i.e., A, B, C, Z.
Which DNA form has the maximum number of base pairs per turn ?
The DNA replication is semi-conservative is proved by an experiment conducted by Meselson and Stahl in 1958. To perform their experiment they use heavy nitrogen (15N) in E. coli. The process of replication in living cells requires a set of enzymes. The main enzyme is DNA dependent DNA polymerase. The DNA-A dependent DNA polymerase catalyse polymerization only in one direction, that is 5→3'. In eukaryotes, the replication of DNA takes place at the S-phase of the cell cycle.
Viruses grown in the presence of radioactive phosphorus contained radioactive ________ but not radioactive ________ .
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Read the following text and answer the following questions on the basis of the same :
DNA, a long polymer of deoxyribonucleotide. Altmann and these substances to be acidic hence he named nucleic acid. The basic unit of DNA is a nucleotide which has three components—a nitrogenous base, a pentose sugar (deoxyribose) and a phosphate group. There are two types of nitrogenous bases in DNA, Purine and Pyrimidine. J. Watson and F. Crick proposed a double helix model for the structure of DNA. There are four types of DNA i.e., A, B, C, Z.
Which among the following does not confer stability to the helical structure of DNA ?
Read the following and answer the question given below:
The lac operon consists of a regulation gene and three structural genes. The lactose acts as an inducer. In the presence of an Inducer such as lactose, the repressor is inactivated during the interaction. This allows RNA polymerase access to the promoter and transcription proceeds. The repressor is synthesized which in turn binds with the operator region of the operon and prevents RNA polymerase from transcribing the operon.
When the process of Lac operon is blocked by a repressor it represents :
Read the following text and answer the following questions on the basis of the same :
DNA, a long polymer of deoxyribonucleotide. Altmann and these substances to be acidic hence he named nucleic acid. The basic unit of DNA is a nucleotide which has three components—a nitrogenous base, a pentose sugar (deoxyribose) and a phosphate group. There are two types of nitrogenous bases in DNA, Purine and Pyrimidine. J. Watson and F. Crick proposed a double helix model for the structure of DNA. There are four types of DNA i.e., A, B, C, Z.
Cytidine is a :
The DNA replication is semi-conservative is proved by an experiment conducted by Meselson and Stahl in 1958. To perform their experiment they use heavy nitrogen (15N) in E. coli. The process of replication in living cells requires a set of enzymes. The main enzyme is DNA dependent DNA polymerase. The DNA-A dependent DNA polymerase catalyse polymerization only in one direction, that is 5→3'. In eukaryotes, the replication of DNA takes place at the S-phase of the cell cycle.
During DNA replication, the breaking of H-bonds is performed by :
Read the following text and answer the following questions on the basis of the same :
DNA, a long polymer of deoxyribonucleotide. Altmann and these substances to be acidic hence he named nucleic acid. The basic unit of DNA is a nucleotide which has three components—a nitrogenous base, a pentose sugar (deoxyribose) and a phosphate group. There are two types of nitrogenous bases in DNA, Purine and Pyrimidine. J. Watson and F. Crick proposed a double helix model for the structure of DNA. There are four types of DNA i.e., A, B, C, Z.
Heaviest molecule of protoplasm is :
Read the following and answer the question given below:
The lac operon consists of a regulation gene and three structural genes. The lactose acts as an inducer. In the presence of an Inducer such as lactose, the repressor is inactivated during the interaction. This allows RNA polymerase access to the promoter and transcription proceeds. The repressor is synthesized which in turn binds with the operator region of the operon and prevents RNA polymerase from transcribing the operon.
Identify the correct sequence of the structural genes in the lac operon
Read the following text and answer the following questions on the basis of the same :
DNA, a long polymer of deoxyribonucleotide. Altmann and these substances to be acidic hence he named nucleic acid. The basic unit of DNA is a nucleotide which has three components—a nitrogenous base, a pentose sugar (deoxyribose) and a phosphate group. There are two types of nitrogenous bases in DNA, Purine and Pyrimidine. J. Watson and F. Crick proposed a double helix model for the structure of DNA. There are four types of DNA i.e., A, B, C, Z.
Phosphoric acid is found in :
The DNA replication is semi-conservative is proved by an experiment conducted by Meselson and Stahl in 1958. To perform their experiment they use heavy nitrogen (15N) in E. coli. The process of replication in living cells requires a set of enzymes. The main enzyme is DNA dependent DNA polymerase. The DNA-A dependent DNA polymerase catalyse polymerization only in one direction, that is 5→3'. In eukaryotes, the replication of DNA takes place at the S-phase of the cell cycle.
How many types of DNA polymerases are associated with eukaryotic cells ?
Read the following and answer the question given below:
The lac operon consists of a regulation gene and three structural genes. The lactose acts as an inducer. In the presence of an Inducer such as lactose, the repressor is inactivated during the interaction. This allows RNA polymerase access to the promoter and transcription proceeds. The repressor is synthesized which in turn binds with the operator region of the operon and prevents RNA polymerase from transcribing the operon.
Which of the following statements is true in reference to the lac operon process in E.coli?
(i) Galactosidase is the only enzyme produced in large quantities when lac operon is turned on (ii) The messenger RNA in lac operon is a polycistronic mRNA
The DNA replication is semi-conservative is proved by an experiment conducted by Meselson and Stahl in 1958. To perform their experiment they use heavy nitrogen (15N) in E. coli. The process of replication in living cells requires a set of enzymes. The main enzyme is DNA dependent DNA polymerase. The DNA-A dependent DNA polymerase catalyse polymerization only in one direction, that is 5→3'. In eukaryotes, the replication of DNA takes place at the S-phase of the cell cycle.
DNA replication is :
Read the following and answer the question given below:
The lac operon consists of a regulation gene and three structural genes. The lactose acts as an inducer. In the presence of an Inducer such as lactose, the repressor is inactivated during the interaction. This allows RNA polymerase access to the promoter and transcription proceeds. The repressor is synthesized which in turn binds with the operator region of the operon and prevents RNA polymerase from transcribing the operon.
What provides a binding site to RNA polymerase?
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Teminism is bidirectional flow of information.
Reason (R) : It requires DNA dependent RNA polymerase enzymes.
Read the following and answer the question given below:
The lac operon consists of a regulation gene and three structural genes. The lactose acts as an inducer. In the presence of an Inducer such as lactose, the repressor is inactivated during the interaction. This allows RNA polymerase access to the promoter and transcription proceeds. The repressor is synthesized which in turn binds with the operator region of the operon and prevents RNA polymerase from transcribing the operon.
The lac operon of E. coli contains genes involved in lactose metabolism. It's expressed only when lactose is____________(1) and glucose is _________(2).
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