Thermoregulation depends on monitoring of blood temperature. What structure acts as the mammalian temperature sensor?
A. Peripheral blood vessels
B. Thyroid
C. Anterior pituitary gland
D. Hypothalamus
E. Adrenal medulla
Answer: D
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Many sponges are hermaphroditic, which means that
a. both males and females are filter feeders. b. both males and females produce sperm. c. a single individual produces both sperm and eggs. d. only males have flagellae. e. both males and females produce gemmules.
Which of the following statements about
viruses is TRUE?
a. They were the first form of life to evolve. b. They do not attack plants. c. They are able to reproduce without using other organisms. d. They are made of protein only. e. They include some forms that are able to attack bacteria.
In the United States, what fuel source supplies the largest percentage of total energy?
a. nuclear energy b. renewable energy c. coal d. natural gas e. petroleum
What is the purpose of the cristae of the inner membrane of mitochondria?
a. To store food b. Tto transport waste c. To metabolize lipids d. To increase surface area e. To break down nutrients