Which of these ecosystems has the lowest productivity?
A. tropical forest
B. temperate forest
C. savanna
D. open ocean
E. lakes
D. open ocean
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Tropic hormones:
A. act on other endocrine glands. B. are released from the thyroid gland. C. regulate the metabolic state of the body. D. suppress the immune system. E. suppress the appetite.
The edible portion of the mushroom is the ________.
A. mycelium B. hyphae C. above-ground reproductive structure D. spore
In which of the following properties are the archaea more like eukaryotes than the bacteria?
A) size B) microtubules and microfilaments C) translation initiation D) mode of cell division E) both translation initiation and mode of cell division
Activated B lymphocytes that secrete antibodies are called ________.
A. T lymphocytes B. plasma cells C. macrophages D. monocytes