Fungal cell walls contain:
a. lignin
b. chitin
c. cellulose
d. glycogen
e. keratin
b
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A Pasteur flask has a(n)
A) swan neck to prevent particulate matter from getting into the main body of the flask. B) double neck so two substances may be added at the same time. C) secondary opening at the base to allow for drainage. D) inverted upper edge to prevent spillage while swirling.
Transmembrane movement of a substance with a concentration gradient, with no involvement of membrane proteins, is called ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following characteristics do all animals share?
A. They are multicellular prokaryotes. B. They are single-celled eukaryotes. C. They are multicellular eukaryotes. D. They are single-celled prokaryotes.
Which gas is increased in the atmosphere and
amplifies the green house effect?
a. carbon dioxide b. nitrous oxide c. phosphates d. bicarbonates e. more than one of these