Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes?
Retrovirus
Ti plasmid
pBR 322
λ phage
A.
Retrovirus
Retrovirus is commonly used as vector for introducing a DNA fragment in human lymphocyte.
Gene therapy: Lymphocyte from the blood of the patient are grown in culture outside the body, a functional gene is introduced by using a retroviral vector, into these lymphocyte.
Which of these statements is incorrect?
Enzymes of TCA cycle are present in mitochondrial matrix
Glycolysis occurs in cytosol
Oxidative phosphorylation takes place in outer mitochondrial membrane
Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms
The two functional groups characteristic of sugars are
Hydroxyl and methyl
Carbonyl and methyl
Carbonyl and hydroxyl
Carbonyl and phosphate
The stage during which separation of the paired homologous chromosomes begins is
Pachytene
Diplotene
Zygotene
Diakinesis
Pollen grains can be stored for several years in liquid nitrogen having a temperature of
–120°C
–80°C
–160°C
–196°C
Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as
Polysome
Polyhedral bodies
Nucleosome
Plastidome
Use of bioresources by multinational companies and organisations without authorisation from the concerned country and its people is called
Bio-infringement
Biopiracy
Bioexploitation
Biodegradation
Which of the following is true for nucleolus?
Larger nucleoli are present in dividing cells
It is a membrane-bound structure
It is a site for active ribosomal RNA synthesis
It takes part in spindle formation
Double fertilization is
Fusion of two male gametes of a pollen tube with two different eggs
Fusion of one male gamete with two polar nuclei
Syngamy and triple fusion
Fusion of two male gametes with one egg
