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In the eukaryotes replication of chromosomal DNA happens only in the S phase of the cell cycle. As for bacterial DNA, eukaryotic DNA is replicated
figure: The eukaryotic cell cycle. The S point is typically 6-8 h long, G2 is a point in which the cell prepares for mitosis and lasts for 2-6 h, mitosis itself (M) is short and takes only about 1 h. The length of G1 is very variable and depends on the cell type. Cells can enter G0, aquiescent phase, instead of continuing with the cell cycle.
Secretion of Hormones The secretion of most hormones (except steroid) is by the process of exocytosis. Figure summarises the formation, transport, release and reconstitution o
Countercurrent flow is the arrangement by which fish get oxygen from the water which flows by the help of their gills. The water flows across the respiratory surface of the gill i
Determine the parts consists in Our urinary system Our urinary system consists of following: Two kidneys Two ureters One urinary bladder One urethra Apart fr
The sewage treatment methods can be classified into the following heads: Primary treatment Secondary treatment Tertiary treatment 1. Primary Treatment: The primary
Asexual Reproduction Asexual reproduction is also known agamic reproduction because there is no involvement of gametes in it. Asexual methods of reproduction are
What is panspermia? The Panspermia is a hypothesis that describes life on earth as not originated from the planet. The thought is that the first living beings that colonized th
Epidemiology: The study of disease in populations. Includes: The Aetiology of the disease Patterns of distribution of the disease How the disease spread
What do you mean by sex ratio? Sex Ratio is defined as "the number of females per 1000 males". Sex ratio is an important social indicator to measure the extent of prevailing e
Gills - Respiration Gills are highly vascularised extensions of gas exchange membranes. The simple type may be extension of the body surface as in sea-slugs, sea stars and ma
what are the animals with respiratory organs?
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