Why do smooth muscle and skeletal muscle have distinct mRNA forms?
a. due to aminoacylation
b. due to degeneracy
c. due to alternative splicing
d. due to polyadenylation
Ans: c. due to alternative splicing
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A(n) ________ consists of a motor neuron and all the muscle cells that it stimulates
Fill in the blank(s) with correct word
All living things need carbon. How does carbon enter the living portion of an ecosystem?
A) Atmospheric CO2 taken in by photosynthesis B) Atmospheric CO2 taken in by soil bacteria C) Elemental carbon taken in by plant roots D) Elemental carbon taken in by plant leaves
While flipping through an agriculture products catalog, you come across the following advertisement, "The Centralized Ripening System-makes large scale hormone distribution even easier!". What hormone does this product distribute?
A. ethylene B. abscisic acid C. cytokinin D. auxin E. gibberellin
Which of the following statements about skeletal muscle contraction is false?
(a) When a muscle cell receives a signal from the nervous system, voltage-gated channels open in the T-tubule membrane. (b) The changes in voltage across the plasma membrane that occur when a muscle cell receives a signal from the nervous system cause an influx of Ca2+ into the sarcoplasmic reticulum, triggering a muscle contraction. (c) A change in the conformation of troponin leads to changes in tropomyosin such that it no longer blocks the binding of myosin heads to the actin filament. (d) During muscle contraction, the Z discs move closer together as the myosin heads walk toward the plus ends of the actin filaments.