DNA fragments generated by the restriction endonucleases in a chemical reaction can be separated by
centrifugation
polymerase chain reaction
electrophoresis
restriction mapping
C.
electrophoresis
DNA fragments generated by the restriction endonucleases in a chemical reaction can be separated by electrophoresis. The polymerase chain reaction is simply DNA replication in a test tube. Restriction mapping is the process of obtaining structural information on a piece of DNA by the use of restriction enzymes, e.g., endonucleases that recognise specific 4 to 8 base regions of DNA.
The colonies of recombinant bacteria appear white in contrast to blue colonies of non-recombinant bacteria because of
Non-recombinant bacteria containing -galactosidase
lnsertional inactivation of -galactosidase in non-recombinant bacteria
lnsertional inactivation of -galactosidase in recombinant bacteria
Inactivation of glycosidase enzyme in recombinant bacteria
Secondary productivity is rate of formation of new organic matter by
producer
parasite
consumer
decomposer
Which one of the following is not used for ex situ plant conservation?
Field gene banks
Seed banks
Shifting cultivation
Botanical gardens
Which of the following represent maximum number of species among global biodiversity?
Algae
Lichens
Fungi
Mosses and ferns
Match the name of the animal (Column I) with one characteristics (Column II) and the phylum/class (Column III) to which it belongs
Column I | Column II | Column III |
Petromyzon | Ectoparasite | Cyclostomata |
Ichthyophis | Terrestrial | Reptilia |
Limulus | Body covered by chitinous exoskeleton | Pisces |
Adamsia | Radially symmetrical | Porifera |
A pregnant female delivers a baby, who suffers from stunted growth, mental retardation low intelligence quotient and abnormal skin. This is the result of
deficiency of iodine in diet
low secretion of growth hormone
cancer of the thyroid gland
over secretion of pars distalis
What is the correct sequence of sperm formation?
Spermatid, Spermatocyte, Spermatogonia, Spermatozoa
Spermatogonia, Spermatocyte, Spermatozoa, Spermatid
Spermatogonia, Spermatozoa, Spermatocyte, Spermatid
Spermatogonia, Spermatocyte, Spermatid, Spermatozoa