641. A swelling in the band of a polytene chromosome is and indication of

A Gene action
B Gene inaction
C Mutation
D Gene damage
Answer :   Gene action
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642. Inner membrane convolutions of a mito- chondrion are known as

A lamellae
B thylakoids
C grana
D cristae
Answer :   cristae
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643. A codon is made up of

A Single nucleotide
B Two nucleotides
C Three nucleotides
D Four nucleotides
Answer :   Three nucleotides
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644. Given below is sequence of the processed mRNA ready for translation 5' AUG CUA UAC UAA CUG CCA UGC UAG-3' How many amino acids will present in polypeptide chain corresponding to this mRNA

A 7
B 8
C 6
D 3
Answer :   3
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645. Genetic information are transferred from nucleus to cytoplasm of cell through

A DNA
B RNA
C Lyosomes
D ACTH
Answer :   RNA
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646. Which one of the following cell organelles is enclosed by a single membrane ?

A Mitochondria
B Chloroplasts
C Lysosomes
D Nuclei
Answer :   Lysosomes
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647. In which one of the following enzymes is copper necessarily associated as a activator

A Cabonic anhydrse
B Trrptophanase
C Lactic dehydrogenase
D Tyrosinane
Answer :   Tyrosinane
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648. Nucleoside is

A Polymer of nucleic acid
B Phosphoric acid + base
C Phosphoric acid + sugar + base
D Sugar+ base
Answer :   Sugar+ base
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649. Which of the following is the simplest amino acid

A Alanine
B Asparagine
C Glycine
D Tyrosine
Answer :   Glycine
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650. Ribosomal RNA is actively synthesized in

A Lysosomes
B Nucleolus
C Nucleoplasm
D Ribosomes
Answer :   Nucleolus
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Practice More MCQ Question on Biology Section

BotanyThe Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisonTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and DevelopmentReproduction in OrganismsSexual Reproduction in Flowering PlantsPrinciples of Inheritance and VariationMolecular Basis of InheritanceStrategies for Enhancement in Food ProductionMicrobes in Human WelfareOrganisms and PopulationsEcosystemBiodiversity and ConservationEnvironmental IssuesBotany Miscellaneous
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