Which organisms are considered most primitive based upon the structure of their limbs?

a. bats
b. reptiles
c. porpoises
d. penguins
e. birds


ANSWER: b

Biology & Microbiology

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You measure the amount of enzyme activity in the presence of compound X and note that as you add more substrate the amount of enzyme activity increases. This indicates that the compound X is an __________.

A. non-competitive inhibitor B. competitive inhibitor C. activator D. allosteric inhibitor E. enzyme

Biology & Microbiology

DNA evidence has strongly supported the original groupings proposed by Carl Linnaeus to show relationships between organisms

Indicate whether the statement is true or false

Biology & Microbiology

A species found only within a certain region is said to be _______________ to that region.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

The figure below shows five water molecules. The hydrogen bonds shown in this figure are each between


A) two hydrogen atoms.
B) an oxygen and a hydrogen atom of the same water molecule.
C) an oxygen and a hydrogen atom of different water molecules.
D) two atoms with the same charge.

Biology & Microbiology