Lipids, small molecules, and uncharged particles pass into and out of the cell with relative ease. What characteristics of the cell membrane can be inferred from these observations?

From the following transistor characteristics, what can be inferred?

Most of the alpha -particles passed through the foil undeviated . What can be concluded from this observation ?

All chromosomes of a cell are directed towards one side and are attached to the nuclear membrane, can be observed in

A scientist was studying the production of a protein that was released by an animal cell into a culture medium, she found that the protein only appeared in the culture medium after the added a few drops of a hormone to the cell. Before adding the hormone, she labelled the protein inside the cell with a fluorescent dye and looked at the cell under the lgiht microscope. The dye was seen in flattened sheets and tube. like structures throughout the cell, and in stacks of flattened sac-like structures. after adding the hormone, the dye was aslo seen as small dots clustered against the cell membrane, Which statement most likely explains these observations?

Minerals are present in the soil as charged particles (ions) which can move across cell membrane easily.

Name any three single membrane bound cell organelles. How these organelles can be differentiated from each other?

In a particular double star system two stars of mass 3.22xx10^(30) kg each revolve about their common centre of mass 1.12xx10^(11) on away. (i). Calculate their common period of revolution, in years (ii). Suppose that a meteoroid (small solid particle in space) passes through this centre of mass moving at right angles to the orbital plane of the stars. What must its speed be if it is to escape from the gravitational field of the double star?

Which one can pass easily through cell membrane of target cells and bind to internal receptors

Go through the following statements (i) In human beings, the membrane of the erythrocyte has approximately 52 percent lipids and 40 percent proteins (ii) Lipids are arranged within the membrane with the hydrophobic tails towards the outer side and the polar head towards the inner side. (iii) As the polar molecules cannot pass through the non- polar lipid bilayer, they require a carrier protein of the membrane to facilitate their transport across the membrane (iv) The endomembrane system includes endoplasmic reticulum, Golgi complex, lysosomes and peroxisomes Find out the wrong peroxisomes :

Name two cell organelles that are double membrane bound. What are the characteristics of these two organelles? State their functions and draw labelled diagrams of both.