An artificial pacemaker supplements the actions of the
1.sympathetic nerves.
2.atrioventricular node.
3.medulla oblongata.
4.sinoatrial node.
5.heart muscle, itself.
4
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Along with lipids, the skin of amniotes is filled with ____ to help prevent water loss
a. squalene b. bone c. keratin d. collagen e. albumin
Which of the following is not associated with mRNA processing in eukaryotes?
A) addition of a 5' methyl guanosine cap B) 3' polyadenylation C) removal of introns D) removal of exons E) removal of exons and introns
There are over 11,500 species of these protists that have ornate, glasslike shells.
A. green algae B. diatoms C. brown algae D. red algae
Cell cycle progression is tightly regulated to ensure that the nuclear genome is intact and the conditions are appropriate for ______.
Fill in the blank(s) with the appropriate word(s).