Yogurt contains galactose and glucose, which are generated when bacterial enzymes act on milk sugars. What is the main source of the galactose in yogurt?
A. Maltose
B. Sucrose
C. Lactose
D. Fructose
E. Glycogen
C
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Fall leaf color on deciduous trees is a result of
A. the production of more accessory pigments because of the cooler temperatures. B. the reduction in the production of accessory pigments. C. cessation of chlorophyll production, which allows the accessory pigments to be revealed. D. the increased angle of the sun during the fall, which reflects more of the accessory pigments.
Why are the chances of an immune response in a patient given between 10 µg and 1g of an immunogen (drug) higher than a patient given higher than 1g or lower than 10 µg of the same drug?
What will be an ideal response?
Energy captured by producers usually passes through no more than four or five trophic levels. Even in ecosystems with many species, the number of participants in each food chain is limited. The inefficiency of energy transfers constrains the length of food chains. What factors limit the efficiency of energy transfers?
What will be an ideal response?
Imagine that you are studying a very large population of moths that is isolated from gene flow. A single gene controls wing color. Half of the moths have white-spotted wings (genotype WW or Ww) and half of the moths have plain brown wings (ww). There are no new mutations, individuals mate randomly, and there is no natural selection on wing color. How will p, the frequency of the dominant allele, change over time?
A) p will increase; the dominant allele will eventually take over and become most common in the population. B) p will neither increase nor decrease; it will remain more or less constant under the conditions described. C) p will decrease because of genetic drift. D) p will increase initially, then decrease until the W allele vanishes from the population. E) p will fluctuate rapidly and randomly because of genetic drift.