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Academic Questions
An alga very rich in protein is
Spirogyra
Ulothrix
Oscillatoria
Chlorella
Which one of the following has haplontic life cycle?
Funaria
Polytrichum
Ustilago
Wheat
Which one is the wrong pairing for the disease and its causal organism?
Late blight of potato — Alternaria solani
Black rust of wheat — Puccinia graminis
Loose smut of wheat — Ustilago nuda
Root-knot of vegetables — Meloidogyne sp.
Claviceps purpurea is causal organisms of
Smut of barley
Rust of wheat
Ergot of rye
Powdery mildew of pea
Decomposers are organisms that
Illaborate chemical substances, causing death of tissues
Operate in living body and simplifying organic substances of cells step by step
Attack and kill plants as well as animals
Operate in relay terms, simplifying step by step the organic constituents of dead body
Thermococcus, Methanococcus and Methanobacterium exemplify
Archaebacteria that contain protein homologous to eukaryotic core histones
Archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled
Bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria
Bacteria that contain a cytoskeleton-afld ribosomes
Sickle cell anaemia is
An autosomal linked dominant trait
Caused by substitution of valine by glutamic acid in the p^globin chain of haemoglobin
Caused by a change in base pair of DNA
Characterized by elongated sickle like RBCs with a nucleus
Removal of introns and joining the exdns in a defined order in a transcription unit is called
Splicing
Tailing
Transformation
Capping
What is true about the isolated small tribal populations?
There is a decline in population as boys marry girls only from their own tribe
Hereditary diseases like colour blindness do not spread in the isolated population
Wrestlers who develop strong body muscles in their life time pass this character on to their progeny
There is no change in population size as they have a large gene pool
E.coli about to replicate was placed in a medium containing radioactive thymidine for five minutes. Then it was made to replicate in a normal medium. Which of the following observation shall be correct ?
Both the strands of DNA will be radioactive
One strand radioactive
Each strand half radioactive
None is radioactive
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