At rest, expiration is a(n) ________ process that involves ________.
A) passive : relaxation of the internal intercostals
B) active : contraction of the internal intercostals
C) active : the contraction of the diaphragm
D) active : relaxation of the diaphragm
E) passive : relaxation of the diaphragm and external intercostals
Ans: E) passive : relaxation of the diaphragm and external intercostals
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Eukaryotes have ____ type(s) of RNA polymerase.
A. two B. three C. four D. one E. 64
If Raf is mutated so that it is "on" constitutively, what is the effect on the cell?
a) the cells lose growth control b the cells dedifferentiate c) the cells increase in volume permanently d) the cells differentiate e) the cells stop dividing
Which of these would a paleontologist most likely do to determine if a fossil represents a reptile or a mammal?
A) Look for the presence of milk-producing glands. B) Look for the mammalian characteristics of a four-chambered heart and a diaphragm. C) Use molecular analysis to look for the protein keratin. D) Examine the teeth.
When two tertiary proteins combine you have ___________ structure.
Fill in the blank(s) with the appropriate word(s).