You have been having trouble with acid indigestion recently. You buy some milk of magnesia, an antacid, from the drug store to relieve your indigestion. Milk of magnesia is a mixture of magnesium hydroxide in water. What makes milk of magnesia a good
antacid? If you could chemically analyze your stomach fluids, what would you find before and after taking the antacid?
What will be an ideal response?
Magnesium hydroxide provides hydroxide ions, which will neutralize the acidity by removing hydrogen ions. Stomach fluids will have a low pH before taking the antacid and a higher pH afterward.
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Vertebrates that practice internal fertilization employ three strategies for embryonic and fetal development. In one strategy, the female retains the eggs within her body and the young are fully developed when they hatch inside of her. What is this called?
A. oviparity B. ovoviviparity C. viviparity D. protogyny E. protandry
At the completion of oogenesis, ____ are produced
a. male gametes b. four sperm cells c. four egg cells d. one egg cell and three polar bodies e. haploid spores
The recent appearance of antibiotic-resistant strains of bacteria is an example of
A) the action of memory cells. B) evolution by natural selection. C) natural immunity. D) inflammation.
Which one of the following organisms has a cell wall?
A) protoplasts B) fungi C) L forms D) mycoplasmas E) animal cells