Dominance is not consistent with blending inheritance
__________________ Indicate whether the statement is true or false.
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Which of the following is the correct sequence that describes the excitation and contraction of a skeletal muscle fiber?
1. Tropomyosin shifts and unblocks the cross-bridge binding sites. 2. Calcium is released and binds to the troponin complex. 3. Transverse tubules depolarize the sarcoplasmic reticulum. 4. The thin filaments are ratcheted across the thick filaments by the heads of the myosin molecules using energy from ATP. 5. An action potential in a motor neuron causes the axon to release acetylcholine, which depolarizes the muscle cell membrane. A) 1 ? 2 ? 3 ? 4 ? 5 B) 2 ? 1 ? 3 ? 5 ? 4 C) 2 ? 3 ? 4 ? 1 ? 5 D) 5 ? 3 ? 1 ? 2 ? 4 E) 5 ? 3 ? 2 ? 1 ? 4
Your research project involves characterizing the expression pattern of a nuclear pore protein. After using immunohistochemistry to fluorescently label the protein, you decide that you would like to capture the data as a 3-D image. Which microscope should you use?
A. confocal microscope B. scanning electron microscope C. phase-contrast microscope D. fluorescence microscope
The gonads produce steroids. The specific steroid-producing organelle in gonad cells is
A. ribosomes. B. lysosomes. C. smooth endoplasmic reticulum. D. mitochondria. E. contractile vacuole.
With each turn of the Krebs cycle, ____
a. the majority of ATP are produced b. oxygen is produced c. carbon dioxide is utilized d. NADH and FADH2 are produced e. pyruvate is produced