One motor unit obeys a principle called the all-or-none law.
Answer the following statement true (T) or false (F)
True
All the muscle fibers in a motor unit are stimulated at once. They all either contract or do not contract.
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The pairwise map distances for four linked genes are as follows: A-B = 22 m.u., B-C = 7 m.u., C-D = 9 m.u., B-D = 2 m.u., A-D = 20 m.u., A-C = 29 m.u. What is the order of these four genes?
A) ABCD B) ADBC C) ABDC D) BADC E) CADB
Radioactive isotopes have
a. excess electrons. b. excess protons. c. excess neutrons. d. insufficient neutrons. e. insufficient protons
All of the following have exoskeletons EXCEPT
a. lobsters. b. spiders. c. insects. d. earthworms. e. centipedes.
Which of the following mutagens is most different than the others in terms of its effect on DNA?
A. Base analogue B. Planar mutagen that inserts between stacked bases C. Acridine orange D. Intercalating agent