What is the movement of molecules from an area of higher concentration to one of lower concentration?

Why do enzymes generally only bind to one type of substrate?

Acetylcholinesterase: a) Is stored in vesicles in the motor neuron terminal b) Combines with receptors on the muscle membrane to depolarize the muscle cell/fiber c) Breaks down and inactivates acetylcholine d) Is the chemical transmitter at the

Select one: a. The two species of barnacles do not compete with each other because they feed at different times of day. b. Balanus is a predator on Chthamalus. c.

Why do food chains not have an infinite number of links

ectothermic organims have body temperatures that vary with the temperature of their surroundings. discuss the effect this variation might have on the functioning of enzymes in these organisms.

Which water-soluble vitamin plays an important role in the formation of collagen? A. vitamin C B. thiamin C. folate D. biotin

What is the theory on how cells came to have mitochondria.

Which of the following lists fits the order of these three descriptions: Age of Mammals, Age of Dinosaurs, and longest geologic time period. Choose one: A. Mesozoic, Cenozoic, Paleozoic B. Cenozoic, Mesozoic, Precambrian C.

The hypothalamus gland is important in many feedback loops. Which of the following systems does the hypothalamus work in? Check all that apply. A. endocrine B. nervous C. integumentary D. circulatory

Which scientist is matched with his contribution to evolutionary theory? Jean-Baptiste Lamarck-population growth Charles Darwin-inheritance of acquired traits Thomas Malthus-relationship of all living things Erasmus Darwin-competition and sexual