Which cell structure is mainly responsible for releasing energy from food molecules in some single-celled organisms?

(1) ribosome

(2) chloroplast

(3) cell membrane

(4) mitochondrion

The joints of the human skeletal system a. keep us upright. b. hold bones in place. c. allow for flexible movement. d. have fluids that fight disease.

Molecules that are not able to independently diffuse across a membrane may still move down their concentration gradient by

What connection does an ant have with an elephant

A lion is major predator in an African savanna food chain. What would happen is the lion was suddenly was removed from this food web

A population of white rabbits and brown rabbits both live in a temperate deciduous forest where the summers are mild and average about 50°F. The winters are often below freezing.

What is the signal for a vesicle storing peptide hormone to move to the plasma membrane and release contents of vesicle? a. Activation of an integrin receptor b. Activation of a g-protein c. Activation of an enzyme linked receptor d.

Which factor causes the greatest increase in an area's flash flood risk?

A body weight that is 10 to 15 percent below the desired weight is

How should we properly understand human nature?

Which molecule would be the most affected by limited nitrogen