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Denaturation: With respect to the nucleic acids, refers to the conversion from the double-stranded to single-stranded state, many times achieved by heating or alkaline conditions. This is also known as "melting" DNA. In accordance to proteins, refers to the disruption of tertiary and the secondary structure, often attained by heat, detergents, chaotropes, and the sulfhydryl-reducing agents.
CAUSE S OF VARIATION - Effect of environmental conditions Change in the gene pattern like - (a) Random distribution of homologous genes in meiosis (b) Crossing over
are viruses cellular organisms
Q. What is the cellular regeneration? How is the mitosis related to this process? Some tissues are capable to regenerate when injured. The liver, for instance, regenerates when
Does thermal inversion occur in the winter or in the summer? Pollutant low altitude thermal inversion happens in the winter. In this period of the year the sun heats the soil l
Define Food Intake during Polar Expeditions? Observations made by Easty (1967) at Halley Bay, the British Antarctic survey base during 1961-62 expeditions indicate mean calorie
Q. What is the second polar body? After termination of the second meiotic division of the oocyte II two cells are generated: the second polar body and the egg cell proper. The
(a) What are the two main pollutants that contribute to acid rain? (b) Where do these pollutants come from? (c) What direct or indirect effect is 'acid rain
State the Female Reproductive System The female reproductive organ consists of the following: Uterus receives fertilied ovum and featus develops in it Two ovaries produce
What are stomata? How do these structures participate in the plant transpiration? Stomata (singular, stoma) are small specialized passages for water and gases there in the epid
Typical Form or Reparative Regeneration - Heteromorphosis Sometimes the part which grows back is not the same as that which was lost. The phenomenon is called Heteromorphosis.
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