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
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Active transport ________.
utilizes energy cannot transport molecules against a concentration gradient cannot be saturated requires cofactors
An organism in an ecosystem that feeds off others is a(n) ____
a. heterotroph b. producer c. autotroph d. photosynthetic organism e. plant
A mutation of an autosomal recessive trait can remain undetected for generations
a. True b. False
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.