Genetics-ⅱ Miscellaneous Easy Questions and Answers | Page - 1

Genetics-ⅱ Miscellaneous

The double stranded DNA molecule of a virus was found by electron microscopy to have a length of 34 µM.

1. How many nucleotide pairs are there in one molecule ?
1. How many complete turns of the two polynucleotide chains are present in such a double helix ?
1. How many electron microscopy are there in one molecule ?
1. How many DNA molecule are there in one molecule ?
1. None Of These

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NA

Correct Option: E

NA

The term protein splicing refers to

1. Removal of intervening sequences between the genes
1. Splicing out of introns from RNA
1. Removal of intervening protein sequences from the translated protein
1. Joining (splicing) of two different gene products to generate a novel protein

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Protein splicing is an intramolecular reaction of a particular protein in which an internal protein segment (called an intein) is removed from a precursor protein with a ligation of C-terminal and N-terminal external proteins (called exteins) on both sides.

Correct Option: C

Protein splicing is an intramolecular reaction of a particular protein in which an internal protein segment (called an intein) is removed from a precursor protein with a ligation of C-terminal and N-terminal external proteins (called exteins) on both sides.

In eukaryotes the ribosomal RNA genes are transcribed by

1. Reverse transcriptase
1. RNA dependent RNA polymerase
1. RNA polymerase I
1. RNA polymerase III

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RNA polymerase I (also called Pol I) is, in higher eukaryotes, the enzyme that only transcribes ribosomal RNA (but not 5S rRNA, which is synthesized by RNA Polymerase III), a type of RNA that accounts for over 50% of the total RNA synthesized in a cell.

Correct Option: C

RNA polymerase I (also called Pol I) is, in higher eukaryotes, the enzyme that only transcribes ribosomal RNA (but not 5S rRNA, which is synthesized by RNA Polymerase III), a type of RNA that accounts for over 50% of the total RNA synthesized in a cell.

Rho-dependent and rho-independent transcription termination mechanisms operate in prokaryotes. Rho independent termination mechanism involves

1. Binding of the rho protein upstream of the termination element
1. No protein factors and only RNA secondary structure and run of ‘U’ s
1. Presence of UGA or UAA stop codons
1. Binding of accessory factors at termination signal

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Intrinsic termination (also called Rho-independent termination) is a mechanism in prokaryotes that causes RNA transcription to be stopped.[1] In this mechanism, the mRNA contains a sequence that can base pair with itself to form a stem-loop structure 7-20 base pairs in length that is also rich incytosine-guanine base pairs. These bases form three hydrogen bonds between each other and are therefore particularly strong.[strong.[2] Following the stem-loop structure is a chain of uracil residues.

Correct Option: B

Intrinsic termination (also called Rho-independent termination) is a mechanism in prokaryotes that causes RNA transcription to be stopped.[1] In this mechanism, the mRNA contains a sequence that can base pair with itself to form a stem-loop structure 7-20 base pairs in length that is also rich incytosine-guanine base pairs. These bases form three hydrogen bonds between each other and are therefore particularly strong.[strong.[2] Following the stem-loop structure is a chain of uracil residues.

The G + C content of bacteriophage 13 double standed DNA is 68%. What would you expect the G + C content of its mRNA ?

1. About 68%
1. About 34%
1. About 32%
1. About 86%

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In RNA GC content will be one half of the Double strand DNA. So G+C content of RNA is 34%.

Correct Option: B

In RNA GC content will be one half of the Double strand DNA. So G+C content of RNA is 34%.