Which mineral is deficient in a person who has a goiter?
a. magnesium
b. iodine
c. zinc
d. manganese
Ans: b. iodine
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Which of the following countries has the
smallest ecological footprint?
a. Mexico b. China c. United States d. India e. Canada
At the end of gastrulation, which of the following are produced?
a. hollow balls of cells b. embryos with germ layers c. solid balls of cells d. maternal messages e. blastocyst
A simple stain ________.
a. readily differentiates microbial groups b. allows observation of bacterial motility c. improves the contrast between the cell and the background, thus improving the visibility of bacterial cell shapes and structures d. requires two steps: a staining step, then the addition of a mordant to decolorize the specimen
When comparing the number of protons and electrons, a neutral atom has _____
the same number of electrons and protons fewer protons than electrons fewer electrons than protons twice as many protons as electrons