Under which circumstances must facilitated diffusion be used instead of simple diffusion?

Which of the following is characteristic of plant cells, but not animal cells? a. vacuoles c. nucleus b. mitochondria d. cell walls

Which inner ear organ is responsible for the sensation of rotational acceleration?

Which of the following describes the variable that responds to a change? Independent variable Dependent variable Control variable

The movement of small organic molecules, electrolytes, vitamins, and water across the digestive epithelium and into the interstitial fluid of the digestive tract is called

Name two types of lipids

What evolutionary feature would distinguish phytoplankton from zooplankton?

What kind of organisms make up a food web

In this experiment, why didn't we just use ethanol to extract the trimyristin (instead of dichloromethane) ? this would have saved us a step and we would have been able to recrystallize directly after filtration.

How many different enzymes may be in the cytoplasm of a bacterium? How many copies of each enzyme are there?

All vertebrate embryos have slits and