A trace element is one found in specific organisms in ____ quantities and is ____ for normal biological
functions.
a. moderate; unnecessary
b. moderate; vital
c. small; unnecessary
d. large; unnecessary
e. small; vital
E
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A purine on one strand of the DNA is always paired with a pyrimidine on the other strand
Indicate whether the statement is true or false
In the 1700s, a French scientist, Antoine Lavoisier, gained new experimental information by reacting a metal and an acid. His observation of the results seemed to show that much of the metal had been lost in the chemical reaction. Upon weighing the products, the total amounts of materials had not changed during the reaction. This research resulted in the law of conservation of mass. This law also applies to biology, because the materials we are made of are that change forms, but aren't truly lost through biochemical reactions.
A. matter B. isotopes C. energy D. metals E. solutions
The organism shown here represents the
__________ stage in the life cycle. a. sporophyte b. gametophyte c. haploid d. motile e. feeding
Calcium ions are normally in higher concentrations outside most living cells than within cells. Which of the following processes is most likely responsible for this condition?
A) simple diffusion B) facilitated diffusion C) osmosis D) active transport