X inactivation in calico cat fur results in ________________.
A. formation of secondary male characteristics
B. mosaic hair color in females
C. mosaic hair color in males
D. hairless phenotype
E. all-white hair color
Answer: B
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Which of the following is a characteristic of active transport? a. Only small nonpolar molecules are transported
b. Specific membrane proteins are required but no energy is needed. c. It is a passive process. d. Solute movement across the membrane is toward the side with the higher concentration.
Which of the following supplies the greatest percentage of total energy for mankind?
a. natural gas b. nuclear energy c. petroleum d. coal e. renewable energy
When a neuron is at rest, what maintains the high concentration gradients of potassium ions inside the cell and sodium ions outside the cell?
A) diffusion B) osmosis C) active transport D) ion channels
The myofibrils consist of both thin filaments made of actin and thick filaments composed of
A. chitin. B. myosin. C. acetylcholine. D. troponin. E. tropomyosin.