_______ is the most common neurotransmitter released by neurons controlling skeletal muscle contraction.
Fill in the blank(s) with the appropriate word(s).
Ans: Acetylcholine
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How many DNA triplets encode 60 amino acids?
A. 180 B. 30 C. 20 D. 60
Matching II. Choose the one most appropriate
response for each. Letters may be used more than once. 1. ___ muscle cells 2. ___ lining of the intestine 3. ___ nervous system 4. ___ external body covering 5. ___ skeletal system 6. ___ circulatory system 7. ___ stomach, liver, and pancreas (excluding the muscles and nerves) A. develop(s) from ectoderm in embryo B. develop(s) from endoderm in embryo C. develop(s) from mesoderm in embryo
What is radiometric dating?
A) The process of determining the age of a fossil from radioactive isotopes B) The mineralization process by which living things are turned into fossils C) The process of determining the age of a fossil based on which layer in the rock it is found D) The process of determining the age of a fossil using radio waves
Which of the following is part of the small intestine?
a) ileum b) colon c) Pylorus d) Cecum