The primary structure of a protein is
A. the hydrogen bonds between amino acids.
B. the folded, helical nature of the molecule.
C. represented by multiple polypeptide chains.
D. the sequence of amino acids in the polypeptide chain.
E. the number of polypeptide chains in the molecule.
D
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Which of the following muscles functions to maintain an erect spinal column and head?
A) erector spinae B) biceps brachii C) triceps brachii D) rectus femoris E) biceps femoris
Which of the following is the name of the second cervical vertebra?
a. axis c. atlas b. cervix d. coccyx
We have unique patterns on our fingers, toes, palms, and soles created by:
A) dendritic (Langerhans) cells. B) cleavage lines. C) Merkel cells. D) epidermal ridges.
When comparing smooth and skeletal muscle cells, which of the following statements is true?
A. Smooth muscle cells have striations. B. The myofilaments in smooth muscle do not form sarcomeres. C. Smooth muscle cells are larger than skeletal muscle cells. D. Smooth muscle has a lot of actin and myosin. E. Smooth muscle cells are multinucleated.