biology help?

Question

1. For each pair of terms, explain the differences in their meanings.

C. facilitated diffusion, active transport

Answer 1

Facilitated diffusion is when molecules move from an area of high concentration to an area of low concentration across a cell membrane through protein channels.

Active transport requires energy and it moves energy againts a concentration difference.

Answer 2

Facilitated diffusion works on the process that solutes move down concentration gradients (from a place of high concentration to a place of low concentration). Ion channels open and close that allow solutes to cross the membrane and are mediators of facilitated diffusion.

Active transport is when molecules are transported across a membrane, where energy is used to transport the molecule.

Active transport uses energy, facilitated transport does not.

Answer 3

FIRST IT IS IMPORTANT TO KNOW WHAT IT DIFFUSION.. MOMENT OF FROM HIGHER CONCENTRATION TO IT'S LOWER CONCENTRATION (i.e along conc. gradient).

FACILITATED: #1 WHERE THE MOMENT IS ALONG CONCENTRATION GRADIENT BY PROTEINS.
#2 NO ENERGY (ATP MOLECULES) IS UTILIZED

ACTIVE TRANSPORT: #1 WHERE MOMENT IS OPPOSITE TO CONCENTRATION BY PROTEINS.
#2 ENERGY IS UTILIZED

Answer 4

facilitated diffusion : http://www.vivo.colostate.edu/hbooks/cmb/cells/pmemb/diffusion_f.html
active transport:
http://staff.jccc.net/PDECELL/cells/activet.html