The total length of DNA within a human cell nucleus is approximately 2 meters. How does the DNA fit into the relatively small space of a human nucleus, which ranges some 6-10?m in diameter?
What will be an ideal response?
The DNA strands are coiled around histone proteins forming nucleosomes, rather than remaining straight double helices. Further packing of DNA occurs as long chains of nucleosomes coil around other proteins.
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The anterior longitudinal ligament is
A) a paired ligament that connects the laminae of adjacent vertebrae. B) a fibrous band that connects the posterior surfaces of adjacent vertebral bodies. C) a band of fibrous tissue connecting the spinous processes of adjacent vertebrae. D) a longitudinal fibrous band that is attached to the tips of spinous processes from C7 to the sacrum. E) a wide fibrous band that connect the anterior surfaces of the adjacent vertebral bodies.
During which period of a twitch contraction does the muscle action potential move along the sarcolemma of the muscle cell and trigger calcium release into the sarcoplasm?
a) latent period b) contraction period c) relaxation period d) absolute refractory period e) relative refractory period
The intercarpal articulations are ________ joints
A) saddle B) condylar C) hinge D) plane E) ball-and-socket
The driving force propelling blood through the circulatory system is the difference in blood pressure from the beginning of a blood vessel to its end. This difference is known as the blood pressure ________.
Fill in the blank(s) with the appropriate word(s).