In agarose gel electrophoresis, DNA molecules move towards the ____ pole because they ____
a. positive; are negatively charged
b. negative; are positively charged
c. bottom; are pulled by a magnetic force
d. bottom; are pulled by gravity
e. bottom; have a greater density than the gel
ANSWER: a
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Sulfur occurs in all living matter primarily as a component of proteins
Indicate whether this statement is TRUE or FALSE.
In lineages that moved onto land, gills were replaced by lungs; kidneys became better at conserving __________, and
the circulatory system became more efficient. Fill in the blank(s) with the appropriate word(s).
Whittaker's classification included kingdom Monera, which included all prokaryotes. Why is this classification obsolete?
A. Based on fossil evidence, this group has been divided into three newly named kingdoms. B. The prokaryotes, which were included in this kingdom, are now included in Protista. C. Based on molecular data, Monera has been divided into the two distinct domains, Archaea and Bacteria. D. This kingdom now includes more organisms, so the name has been changed.
The __________________ consists of proteins in the blood plasma that are activated when bacteria or fungi are present and that insert into the foreign cell's membrane.
A. natural killer cell B. complement system C. inflammatory response D. macrophagic defense system