The leading reason for liver transplantation in the United States is ________.
A. hepatitis D
B. hepatitis C
C. hepatitis A
D. hepatitis B
Answer: B
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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)
Answer the following statements true (T) or false (F)
1. The same neurotransmitter may produce either excitatory or inhibitory effects on postsynaptic neurons depending on the specific receptor type it binds. 2. Gamma aminobutyric acid (GABA) is the most common inhibitory neurotransmitter in vertebrates. 3. Ionotropic receptors act by activating G proteins in target cells. 4. Metabotropic receptors act by initiating changes in second messenger systems in target cells.
Raising young rats alone, rather than in the company of other rats, may cause:
A) unusual aggression B) changes in many brain regions C) depression D) a decrease in the size of an odor processing structure
Which of the following are examples of molecular homologies? Select all that apply.
A. The lack of an IGF-1 gene in prokaryotes. B. The biochemical pathways for photosynthesis in plants and cellular respiration in animals. C. Similarities among in the metabolic process for the break down of glucose. D. Use of DNA as an information storage molecule. E. The biochemical pathways for cellular respiration in plants and animals.