Which ions are important in maintaining the
membrane potential of the neurons?
a. sodium and chloride
b. potassium and calcium
c. sodium and potassium
d. magnesium and calcium
e. none of these
C
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An herbivore
(a) eats plant material. (b) eats producers. (c) is exemplified by a deer. (d) is all of the above.
In which structure do cilia covered in mucus trap foreign particles?
a. urinary tract b. reproductive tract c. arteries d. respiratory tract e. digestive tract
A distinctive feature of spirochetes is the presence of
A. endoflagella. B. nucleosomes. C. fimbriae. D. variable surface antigens. E. helically arranged pili.
Which of the following statements about the oriC region in E. coli is incorrect?
A) It is 245 base pairs in length. B) It is rich in AT base pairs. C) It includes three repeating sequences of 13 base pairs. D) It is directly recognized and bound by DNA helicase. E) It includes five repeating sequences of 9 base pairs.