The rate of contaminant microbial growth during the exponential phase in food depends on
A) temperature.
B) the nutrient value of the food.
C) water content.
D) temperature, nutrient value, and water content.
Answer: D
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How would cellulose-degrading bacteria in the rumen (stomachs) of a cow benefit the animal?
A. The bacteria would produce, secrete, and incorporate organic molecules as they obtain energy from the cellulose in grass and replicate. The cow could then digest both the secreted organic molecules AND the bacteria that synthesized them. B. The bacteria would produce sugars as they digested the cellulose. These sugars would be given off to the cow as a symbiotic relationship in exchange for the protected location of the stomachs of the cow for the bacteria to grow and replicate in. C. They wouldn't benefit the animal-they would replicate and cause disease in the animal, leading to its death. D. They wouldn't benefit the animal-only the bacteria within the animal. This is why cows must have food sources other than grass in order to survive.
Answer the following statements true (T) or false (F)
1. and inactivated tumor suppressor genes, epigenetic changes in gene expression are seen in cancer. 2. In 2010, a federal judge in the U.S. ruled seven patents on the BRCA1 and BRCA2 genes had been improperly granted. 3. RNA interference was discovered in 1998. 4. Both gene silencing and genome editing techniques are limited by "off-target effects"—doing something other than what we want them to do.
Which is the dominant structure during the life cycle of a fern?
1.gametophyte
2.sporophyte
3.archegonium
4.sporangium
________ is the most common form of nitrogen exported from terrestrial ecosystems in stream water
Fill in the blank(s) with correct word