Answer:
C. Moving a bone back and forth requires the action of at least two muscles.
Explanation:
To move bones in opposite directions muscles must pair up to help move the body part.
Answer:
Question 1: C Messenger RNA
Question 2: D GAC CTT GAT
Question 3: B 20 chromosomes
Question 4: C 75% gray, 25% ebony
Question 5: sperm cells
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Explanation:
Answer: B. Neurotransmitters; C. Enzyme components; E. Hormones
Explanation: Aminoacids have a variety of functions because they can create proteins. These long and complex molecules perform important roles in different biological processes: they are responsible for the formation of enzymes and hormones. In neurotransmitters, the glutamate appears to be related to functions of the brain, like learning and memory. Other functions of the aminoacids are regeneration of muscular cells, have a role in imunology, growth of tissue, production of collagen and others.