Two muscle groups that oppose the action of each other include flexors and extensors, like the biceps and triceps. These muscle groups are known as:
A. agonists
B. antagonists
C. synergists
D. contragonists
B
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Many of the burrowing animals of the mud flat must actively
a. keep digging to exchange gasses. b. circulate water through their burrows. c. live near natural breaks in the sediment for gas exchange. d. maintain an anaerobic environment.
Repressible operons are normally turned on in the cell.
Answer the following statement true (T) or false (F)
The retina contains light sensitive cells
____________________ Indicate whether the statement is true or false.
Carbon-14 has the same:
A) number of protons but more neutrons than carbon-12. B) atomic number and atomic mass as carbon-12. C) atomic number and, therefore, the same number of neutrons as carbon-13. D) atomic mass as both carbon-12 and carbon-13. E) atomic mass and, therefore, the same number of neutrons as carbon-12.