Why is cholesterol a critical component of the plasma membrane?

Programmed cell death is called:

Mrs. Walker has been lonely since all her children moved to other areas.  Her children hope that their frequent e-mails and photographs provide her with some solace.

Stealing money is bad enough, but stealing from a charity is really reprehensible.

Because Julie speaks both Vietnamese and English well, she acts as a liaison between various Vietnamese immigrants and the telephone company, banks, and so on. 

After Billy spent ten of his hard-earned dollars on an autographed picture of his baseball hero, he was heartbroken to learn that the player’s signature was a sham. 

Some child stars reached the zenith of their careers at a very young age and later felt like failures because they couldn’t stay at the top.

People with AIDS are much less resilient than others.  A flu attach that most of us can easily shake off is life-threatening to them.  

The young woman relinquished custody of her baby to adoptive parents because she wanted the child to have a good home, and she know she wasn’t able to provide one. 

Nita allows her son to fritter away his weekly allowance on junk.  She says he’ll soon learn that it’s better to save his money for something he really wants.