In adaptive immunity, which of the following cells act at once in a primary immune response?

A. Neutrophils
B. Macrophages
C. Memory cells
D. Effector cells
E. Eosinophils


Answer: D

Biology & Microbiology

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utilizes energy cannot transport molecules against a concentration gradient cannot be saturated requires cofactors

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An organism in an ecosystem that feeds off others is a(n) ____

a. heterotroph b. producer c. autotroph d. photosynthetic organism e. plant

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A mutation of an autosomal recessive trait can remain undetected for generations

a. True b. False

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Why do related species share homologous traits?

A. Related species have independently evolved similar traits. B. Related species inherited homologous traits from a common ancestor. C. Homologous traits are the products of divergent evolution. D. Related species have adapted to similar environments.

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