activity

The penetration of the sperm activates the egg and initiates a series of changes in the egg cortex and in the egg cytoplasm. Ovulation in the human female occurs at the secondary oocyte stage in which meiosis - I has been completed and the first polar body has been released but second mei..

It is a process by which certain substances like glucose molecules are transported against the concentration gradient. The carrier proteins in the cell membrane carry out the process. The substance present in the medium binds with the active site on the carrier protein forming a comp..

It is the step in which the smaller and the larger subunits of ribosome are joined together. This is brought about by mRNA chain. The latter joins the smaller ribosomal subunit with the help of the first codon by a base pairing with an appropriate sequence on rRNA. The combination of the two is ca..

Movement of ions from the outer space of the cell to the inner space is generally against the concentration gradient and hence requires energy. This energy is obtained through metabolism either directly or indirectly. Various evidences indicate the active uptake of ions by carrier m..

Draw m || l, draw n|| l. Measure the perpendicular distance between m and n at many points. We will find this to be same at all points. This means by the property of parallel line m||n. From the above activity we can conclude that "Two lines which are parallel to the same line, are par..

Newton's Laws of Motion..

Hold a bottle cork in one hand firmly and cut a thin slice with the help of a blade. Place the section in a drop of water on a glass slide and observe under a microscope. You will find cells, which are box-like and closely packed together. Cork ce..

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