Multiple Choice QuestionsSome hyperthermophilic organisms that grow in highly acidic (pH2) habitats belongs to the two groups called
eubacteria and archaea
cyanobacteria and diatoms
protists and mosses
protists and mosses
Genetic engineering has been successfully used for producing
transgenic mice for testing safety to polio vaccine before use in humans
transgenic models for studying new treatments for certain cardiac diseases
transgenic cow -Rosie which produces high-fat milk for making ghee
transgenic cow -Rosie which produces high-fat milk for making ghee
Some of the characteristics of Bt cotton are
long fibre and resistance of aphids
medium yield, long fibre and resistance to beetle pests
high yield and production of toxic protein crystals which kill dipteran pests
high yield and production of toxic protein crystals which kill dipteran pests
D.
high yield and production of toxic protein crystals which kill dipteran pests
Bacillus thuringiensis forms crystals containing a toxic insecticidal protein. Bt toxin protein exists as an inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut, which solubilises the crystals. The activated toxin binds to the surface of midgut epithelial cells and creates pores the cause cell swelling and lysis and eventually cause the death of the insect. Specific Bt toxin genes were isolated from B. thruingiensis and incorporated into the several plants such as cotton. The toxin is coded by the gene name cry. There is a number of them, eg, the proteins encoded by the genes cry IAc a cry II Ab control the cotton bollworms, that of cry IAB control corn borers.
Satellite DNA is useful tool in
Organ transplantation
sex determination
forensic science
forensic science
The second maturation division of the mammalian ovum occurs
shortly after ovulation before the ovum makes entry into the fallopian tube
until after the ovum has penetrated by a sperm
until the nucleus of the sperm has fused with that of the ovum
until the nucleus of the sperm has fused with that of the ovum
Which one of the following does not follow the central dogma of molecular biology?
Pea
Mucor
Chlamydomonas
Chlamydomonas
Which one of the following statements about human sperm is correct?
Acrosome has a conical pointed structure used for piercing and penetrating the egg, resulting in fertilisation
The sperm lysis in the acrosome dissolve the egg envelope facilitating fertilization
Acrosome serves as a sensory structure leading the sperm towards the ovum
Acrosome serves as a sensory structure leading the sperm towards the ovum
Wind pollinated flowers are
small, brightly coloured, producing large number of pollen grains
small, producing large number of dry pollen grains
large, producing abundant nectar and pollen
large, producing abundant nectar and pollen
dB is a standard abbreviation used for the quantitative expression of
the density of bacteria in a medium
a particular pollutant
the dominant Bacillus in a culture
the dominant Bacillus in a culture
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