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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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).
Eukaryotes have ____ type(s) of RNA polymerase.
A. two B. three C. four D. one E. 64