Half of the body's magnesium is stored in the:
A) bones.
B) kidneys.
C) skeletal muscle.
D) extracellular fluid.
Answer: A) bones.
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A farmer is concerned that if she plants seeds for her next harvest, many of them will remain dormant and fail to grow. Depending on the plant, what steps can the farmer take to ensure that many of her seeds will germinate?
A. She can treat her seeds with red light prior to planting. B. She can put her seeds in the refrigerator for a few months before planting. C. She can rub her seeds with sand paper prior to planting. D. She can feed the seeds to her cows and collect them after they have passed through the animals' digestive tracts.
Leptin is a circulating hormone that is produced by fat cells and plays a role in body metabolism and obesity. It normally binds to receptors in the brain and inhibits appetite. Studies have demonstrated that when obese mice that are leptin deficient are injected with leptin they quickly lose their excess weight. Interestingly, however, many overweight people have high levels of leptin in their bloodstream. Why do you think that the high levels of leptin in obese individuals are insufficient to curb their appetite?
A. In obese people with high levels of leptin, the leptin is a non-functional second messenger. B. The form of leptin released by obese people may lack protein kinase activity. C. Obese people who have high levels of leptin may have a leptin receptor with decreased sensitivity. D. Paracrine signaling may be disrupted in obese people with high levels of leptin.
Refer to the figure above. At what numbered point on the graph above does the helium flash occur?
Turbellarian flatworms have a distinct head. When comparing the heads of these flatworms to insect heads, what is it missing?
A. Sensory organs B. Anterior collection of nerve cells C. A mouth D. Light sensitive structures