Cell membrane is selectively permeable because
it is made up of selected organic molecules
it does not allow transport of some substances from region of higher concentration to the region of lower concentration
the movement of organic molecules occurs only at specific concentration
it allows the movement of certain molecules in and out of the cell while the movement of other molecules is prevented
For election to the Lok Sabha, a nomination paper can be filed by
Miscellaneous · Easy
In a month if the seventh day is three days earlier than Saturday,then the nineteenth day of the month will be a
Miscellaneous · Easy
Which among the following events happened earliest ?
Miscellaneous · Easy
An 80-litre solution of alcohol and water has 75% alcohol. How much water (in litres) must be added to bring down the concentration of alcohol to 60%?
Miscellaneous · Easy