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Positive chemotaxis is movement toward the source of the chemical stimulus (along the chemical concentration gradient in air or water); negative chemotaxis is movement away from the source. The phenomenon is known to exist in a number of microorganisms and invertebrates.
52) Each hemoglobin molecule can transport two molecules of oxygen. 52) Answer: True False 53) Diapedesis is the process by which red blood cells move into tissue spaces from the interior of blood capillaries. 53) Answer: True False 54) Positive chemotaxis is a feedback system that signals leukocyte migration into damaged areas. 54) Answer: True False