While sitting in front of the TV, the average person's heart rate is about 70 beats per minute because the nervous system slows the heart down from the approximately 100 beats per minute that the pacemaker, the ________ node, sets

Fill in the blank(s) with correct word


sinoatrial (SA)

Biology & Microbiology

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Members of the phylum Chordata have ________ just behind their mouths that extend to the outside environment.

a. book gills b. pharyngeal slits c. tonsils d. madreporites

Biology & Microbiology

Precipitation is generally greater

A) in the Southern Hemisphere than in the Northern Hemisphere. B) in coastal areas than in interior areas. C) at the equator than at 30° of latitude. D) on the leeward side of mountains than on the windward side.

Biology & Microbiology

The toxin that allows Rhizopus to cause the rice disease known as seedling blight is actually produced by ________ growing within the fungus.

A. Staphylococcus B. Clostridium C. Staphylococcus or Burkholderia, but not Clostridium D. Burkholderia E. None of the choices are correct.

Biology & Microbiology

Answer the following questions true (T) or false (F)

1. A nucleotide with a single cyclic ring structure is a pyrimidine. 2. Denaturation of a protein is always permanent. 3. The valence of an atom is determined by the total number of electrons it contains.

Biology & Microbiology