Can a laptop with no Network Adapter be connected to the internet?

Yes

You can use the modem if it has one or buy an external modem to connect to the serial port. If you want to use broadband then you need to have a USB port and buy a USB to Ethernet adapter or a WiFi USB adapter (if you have wireless access).

Look fo a phone jack. In case you have one, the computer has a dialup modem. Another possibility is a USB wireless or ethernet adapter, in case the computer has USB ports.

U need to insert a Lan Card or Setup a wireless Lan with a computer with internet and u can access by giving ip of that computer as default gateway.

if the laptop has card slots you can by an adapter or if it has usb you can get a usb adapter, but you will have to make sure that the laptops is compatable.

you need a network adapter to connect to the internet.

If the laptop is $15, its not going to run anything on the internet properly. Its probably an old pentium machine that is going to be a piece of junk.

There are USB network devices . .

Also, you could use your Serial port

If you have a PCMCIA slot, you could use that as well

Options are available to you, just get creative.

Sorry but the adapter is the one that enables you to use external modems or internal cards in order to conect to the internet. If you dont install it, it means no internet.

Modem card (see if your laptop has a PCMCIA slot)

Dialup?

Sure, by using a modem.