PKU is a hereditary condition that appears only if a person has two copies of the gene. Therefore, the gene is ________
Fill in the blank(s) with correct word
recessive
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Approximately half of known animal carcinogens can be detected by the Ames test.
Answer the following statement true (T) or false (F)
Dead and injured white blood cells are removed from circulation by the
A) spleen. B) tonsils. C) red bone marrow. D) kidney. E) thymus.
Which of the following statements about the regulation of respiration is false?
a. Respiratory centers in the medulla control the transition from inspiration to expiration. b. Carbon dioxide concentration is the most important chemical stimulus for regulating respiratory rate. c. Chemoreceptors in the walls of various arteries are sensitive to carbon dioxide levels in the blood. d. A group of neurons in the ventral medulla only become active when we need to breathe forcefully. e. Chemoreceptors may be sensitive to oxygen, carbon dioxide, and/or hydrogen ion concentration.
The overwhelming majority of animals are:
A) vertebrates. B) invertebrates. C) mammals. D) sessile. E) unicellular.