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Which of the following reasons is mainly responsible for graft rejection in transplantation of organs?
In higher vertebrates, the immune system can distinguish between self-cells and non-self. If this property is lost due to genetic abnormality and it attacks self–cells, then it leads to:
Given below are two statements: Statement I: When an infected female Anopheles mosquito bites, it releases gametocytes of Plasmodium into the healthy person. Statement II: The female Anopheles mosquito takes up sporozoites of Plasmodium with blood meal from an infected person, suffering from malaria. In light of the above statements, choose the most appropriate answer from the options given below:
Which of the following sets of diseases is caused by bacteria?
Immuno-suppressants are administered to burn patients or during organ transplantation to suppress:
Cellulose does not form blue colour with iodine because
Ligases is a class of enzymes responsible for catalysing the linking together of two compounds. Which of the following bonds is not catalysed by it?
Following are the statements with reference to 'lipids': (a) Lipids having only single bonds are called unsaturated fatty acids. (b) Lecithin is a phospholipid. (c) Trihydroxy propane is glycerol. (d) Palmitic acid has 20 carbon atoms including carboxyl carbon. (e) Arachidonic acid has 16 carbon atoms. Choose the correct answer from the options given below:
Which of the following are not fatty acids?
Which of the following graphs depicts the effect of substrate concentration on velocity of enzyme catalysed reaction?
Which of the following stages of meiosis involves division of centromere?
In the equation $GPP - R = NPP$. GPP is Gross Primary Productivity, NPP is Net Primary Productivity. R here is
The historic Convention on Biological Diversity, 'The Earth Summit' was held in Rio de Janeiro in the year
Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R : Assertion A : Late wood has fewer xylary elements with narrow vessels. Reason R : Cambium is less active in winters. In the light of the above statements, choose the correct answer from the options given below:
The thickness of ozone in a column of air in the atmosphere is measured in terms of :
Identify the correct statements: A. Detrivores perform fragmentation. B. The humus is further degraded by some microbes during mineralization. C. Water soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching. D. The detritus food chain begins with living organisms. E. Earthworms break down detritus into smaller particles by a process called catabolism. Choose the correct answer from the options given below:
What is the role of RNA polymerase III in the process of transcription in Eukaryotes?
During the purification process for recombinant DNA technology, addition of chilled ethanol precipitates out
What is the function of tassels in the corn cob?
How many ATP and $NADPH_2$ are required for the synthesis of one molecule of Glucose during Calvin cycle?