If you are seeking to maintain a healthy weight, should you be concerned about carbohydrate, fat or protein intake? What will be an ideal response?
ANSWER: You should be concerned about the intake of all three! While fats are the most calorie dense,
all three substances contain calories and will contribute to your total caloric intake. Where
body mass is concerned, the source of the calories is less important than the total number of
calories.
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A radioactively labeled protein is made by cells and followed through the various organelles in the secretory pathway. After six hours, all of the radioactivity is still primarily in the Golgi apparatus. This suggests that the
A) protein was not translated by the ribosomes. B) protein does not possess a signal peptide for localization within the lumen of the rough endoplasmic reticulum. C) protein possesses a signal for localization within the Golgi apparatus. D) all of the above
Which benefit, derived from biodiversity, would be categorized as an ecosystem service?
a. the anticancer drug Taxol, derived from the yew tree b. plants and fruits that are edible by humans c. cotton and other useful plant-derived fibers d. decomposition of wastes e. wild organisms as a source of genes for genetic engineering
When the product of reaction A becomes the reactant of reaction B, this exemplifies a ________ metabolic pathway.
A. divergent B. cyclic C. bidirectional D. convergent E. linear
If early Earth's atmosphere contained little or no O2, then where did most of the O2 in our modern atmosphere come from?
A) Photosynthesis B) The breakdown of carbon dioxide C) The splitting of water vapor by sunlight D) The oxidation of metals E) Respiration