Protein A is composed of 312 amino acids. Based on this information, which of the following statements is correct?
A. The mRNA coding for Protein A is composed of at least 936 DNA nucleotides.
B. The gene coding for Protein A is composed of at least 936 DNA nucleotides.
C. The gene coding for Protein A is composed of at least 316 RNA nucleotides.
D. Both "The gene coding for Protein A is composed of at least 936 DNA nucleotides" and "The mRNA coding for Protein A is composed of at least 936 DNA nucleotides" are correct.
Answer: B
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The posterior root of a spinal nerve contains
A) axons of motor neurons. B) axons of sensory neurons. C) cell bodies of motor neurons. D) cell bodies of sensory neurons. E) interneurons.
Lymphocytes with a CD8 glycoprotein on their surface are called ________ cells and lymphocytes with a CD4 glycoprotein on their surface are called ________ cells.
A. B; cytotoxic T B. cytotoxic T; B C. cytotoxic T; helper D. B; helper T E. helper T; cytotoxic T
Which of the following statements about the tongue is false?
A) The dorsal surface is covered with papillae. B) It is composed of skeletal muscle. C) The uvula attaches to the base. D) It secretes lingual lipase. E) It is innervated by the hypoglossal nerve (CN XII).
What prevents the ACh from continuing to stimulate the muscle?
A) Tropomyosin blocks the myosin. B) Calcium returns to the sarcoplasmic reticulum. C) Acetylcholinesterase destroys the Ach. D) None of the listed responses is correct.