Place a large amount of hydrogen gas and oxygen gas in the presence of a fire and you will get an
explosion. In light of this, explain how it is possible that water, which is composed of hydrogen and
oxygen, is often used to put out fires.
What will be an ideal response?
Water is a compound, and compounds typically have chemical and physical properties that are distinct
from the atoms that make them up. So, water had different properties than the hydrogen and oxygen
that it is made of and thus behaves differently from them in the presence of fire.
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The circulatory systems of bony fishes, rays, and sharks are most similar to _____
A) those of birds, with a four-chambered heart B) the portal systems of mammals, where two capillary beds occur sequentially, without passage of blood through a pumping chamber C) those of reptiles, with one pumping chamber driving blood flow to a gas-exchange organ, and a different pumping chamber driving blood to the rest of the circulation D) those of sponges, where gas exchange in all cells occurs directly with the external environment E) those of humans, where there are four pumping chambers to drive blood flow
In North America, what is the greatest risk of warming to trees?
A) reduced growing season B) reduced water availability C) less variable precipitation D) Most species live near their thermal maximum.
Which process is used to release insulin from pancreatic cells into he bloodstream?
A.) exocytosis B.) endocytosis C.) active transport D.) passive transport
Your patient has subacute bacterial endocarditis caused by a member of the viridans group of streptococcus. Which one of the following sites is MOST likely to be the source of the organism?
A. Skin B. Colon C. Oropharynx D. Urethra