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q what are introns and how do they affect the processing of genetic informationintrons a feature of eukaryotic dna are intervening stretches of dna
q why is the concept of a single gene as ultimateunit of inheritance inadequate to provide a unitary explanation for protein synthesis recombination
suppose the restriction endonuclease hindiii cuts a60 kb linear piece of dna into two fragments an 800 bp fragment and a 5200 bp
q why does thymine replace uracil in dnathe difference between dna and rna is existence of a hydroxyl -oh group on 2 carbon of the ribose sugar in
genetic defects in dna repair and human disease1 xeroderma pigmentosum is an inherited disease that is characterized by severe photosensitivity and a
q mismatch and recombinational repairmismatch repair1 mismatches can take place when dna polymerase inserts wrong nucleotide during replication 2
q dna damaged by alkylating agents1 some simple alkylating agents 2 illustrations of products of alkylating agents 3many of these products can be
q spontaneous deamination of cytosine 1 deamination of cytosine is common and results in conversion of cytosine to uracil 2 can be repaired by
dna damage caused by ultraviolet light 1 cyclobutane-type pyrimidine dimer is the major photoproduct formed 2 a second product 6-4 photoproduct is
q can we make artificial cellsresearch in progress at the national aeronautical and space administration nasa is focused on artificial cells as a
q how genes can be exchanged between chromatidswhen two homologous chromosomes physically exchangecorresponding segments during prophase i of meiosis
q what is barr body geneslocated inside nuclear envelope its a densely staining object which is an inactivated x chromosome in female mammalian cells
q how the dna nanoarchitecturing worksdna nano architectures constructs that can be self-assembled from branched dna molecules their components can
q applications of genetic engineeringapplications of genetic engineering in different fields arebull agriculture crops having larger yields drought
q what is genetic engineeringgenetic engineering it is also known as molecular cloning or gene cloning is artificial recombination of nucleic acid
q what is green fluorescent protein gfpgreen fluorescent protein is a protein which is found in a luminescent jellyfish aquorea victoria that lives
q what are the stages of mitosismitosis involves replication of dna and its separation into two new daughter cells whereas only four phases of
q how much dna is in a typical human cellif dna deoxyribonucleic acid molecules in a single human cell were stretched out and laid end to end they
q what is self-catalytic rnasribozymes -term ribozyme was initially suggested by thomas r cech nobel prize winning biochemist who discovered this
q how dna-rna hybridization occursboth dna and rna are able to form hybrids in solution with other rna or dna molecules which have complementary base
q what are the features of hnrnaheterogeneous nuclear rna hnrna - primary precursor mrna transcript made in eukaryotic nucleus are called hnrna an
q how sex occurs in bacteriaoccurrence of sex in bacteria was first described by edward tatum and joshua lederberg in 1946 nature volume 158 page 558
q do all molecules of dna have the same amounts of nitrogenous basesnumber and sequence of nitrogenous bases in dna molecule are key elements in
q is a gene the same as a dna moleculegenes are units of heredity a gene is a section or segment of a dna molecule this section of dna provides a
q what is an illustration of gene controlan elegant instance of gene control in bacteria is operon system a cluster of genes which is responsible for