Answer the question using the accompanying figure. Which number identifies a structure that aids in attachment?
a. 1
b. 2
c. 3
d. 7
e. 8
ANSWER: c
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A monophyletic group is a group that
A) descended from one ancestor. B) has the same fitness level. C) possesses one taxonomic trait that is the same. D) shares one phylogenetic marker.
An animal's circulatory system contains ____
a. solid medium to transport nitrogen b. blood vessels for transporting solid food c. blood vessels leading to the heart d. a mouth opening to the outside e. nitrogen to transport wastes
Radioactive iodine (131I) is commonly used in medical situations for diagnosing and treating thyroid conditions. The most common isotope of iodine that is not radioactive is 127I
Chemically, what is the difference between 127I and 131I? What do they have in common?
Collagen
A. forms junctions between cells. B. is part of a cell wall. C. must be secreted from a cell. D. functions inside a cell. E. acts as an enzyme.