Muscle contraction occurs because
A. actin filaments contract the sarcoplasmic reticulum.
B. actin filaments contract and pull on myosin filaments.
C. myosin filaments are stimulated by acetylcholine.
D. myosin filaments pull on actin filaments.
Answer: D
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Small RNA molecules (20—30 nucleotides in length) that have recently been found to have biological function include
A) microRNAs (miRNA). B) silencing RNAs (siRNA). C) messaging RNAs (mRNA). D) both choices A and C E) all of the above
This part of the brain controls skeletal muscle
activity and governs memory, emotions and abstract thought. This part of the brain is the
a. cerebellum. b. cerebrum. c. medulla oblongata. d. pons. e. thalamus
A body plan of all coelomates is indicated by
a. A. b. B. c. C. d. all of these. e. none of these.
The pathway that a secretory protein takes from inside to outside is: rough endoplasmic reticulum, ________, Golgi complex, ________, outside the cell
Fill in the blank with correct word.