Organisms whose sole source of carbon for growth is CO2 are called ________.
A. autotrophs
B. consumers
C. saprophytes
D. lithotrophs
E. decomposers
Answer: A
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Which of the following is true about the role normal microbiota plays in maintaining host health?
A. They provide a surface that is incompatible for attachment of an invader. B. They establish competition for nutrients and vitamins. C. They produce antimicrobial substances. D. They stimulate the immune system. E. All of the choices are true.
In Gibson’s experiment with small mammal populations in the tropical forest, ____
a. most species disappeared from small islands within the first 5-7 years after fragmentation b. all species disappeared from small islands within the first 5-7 years after fragmentation c. populations increased 25 years after fragmentation d. most species disappeared from small islands, but quickly recolonized after 5-7 years e. fragmentation had no affect on small mammal species
The upper sandy beach often ends:
a. where sand dunes begin. b. where terrestrial vegetation begins. c. at the high tide line. d. both a and b e. both b and c
Macrophages (antigen-presenting cells) will interact with _____ cells which then continue the immune response.
A. cytotoxic T cells B. helper T cells C. B cells D. natural killer cells