Which of the following is not a function of membrane proteins?
a. they serve as channels.
b. they serve as a barrier for water soluble substances
c. they serve as carriers.
d. they serve as receptor sites
e. they serve as membrane-bound enzymes.
B
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The most medial of the abdominal muscles are the ________ muscles.
A. tendinous intersections B. transversus abdominis C. internal oblique D. external oblique E. rectus abdominis
The ________ is composed of smooth muscle fibers and is not under voluntary control
A) rectum B) sigmoid flexure C) anal canal D) internal anal sphincter E) external anal sphincter
Alternative splicing helps explain which of the following?
a) how different genes are activated in different cells b) how more than one codon can code for the same amino acid c) how one gene can produce more than one protein d) how only 4 nucleotides can be used to code for 20 different amino acids
A man presents with median nerve palsy in his left hand. What is the most likely site of injury?
a) Dorsal scapular nerve b) Intercostal nerve c) Lumbar plexus d) Median nerve e) Radial nerve