How have Alaskan salmon been genetically modified?
A) Bacterial genes have been inserted to resist invasive diseases.
B) Genes from freshwater algae have been inserted for an internal energy source.
C) Growth hormone genes from a faster growing fish species have been inserted.
D) Genes for the overproduction of essential fatty acids have been inserted.
C
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Researchers tested nitrogen loss from soil where the moss Dawsonia was growing, and compared it to soil from which Dawsonia had been removed. The data are presented below
Researchers decided to test the hypothesis that if the 1-meter-tall Dawsonia gametophyte-sporophyte plants had acted as a physical buffer, then they would have reduced water's ability to erode the soil and carry away its nitrogen. They began with four equal-sized areas where Dawsonia mosses grew to a height of 1 m above the soil surface. One of the four areas was not modified. In the second area, the mosses were trimmed to a height of 0.5 m above the soil surface. In the third area, the mosses were trimmed to a height of 0.25 m above the soil surface. In the fourth area, the mosses were trimmed all the way to the ground, leaving only the rhizoids. Water, simulating rainfall, was then added in a controlled fashion to all plots over the course of one year. The figure below presents four graphs that depict potential results of this experiment. In the figure above, which graph of soil nitrogen loss over time most strongly supports the hypothesis that if the 1-m tall Dawsonia gametophyte-sporophyte plants had acted as a physical buffer, then they would have reduced water's ability to erode the soil and carry away its nitrogen? A) A B) B C) C D) D E) None of these graphs support the hypothesis.
The function of the Rev protein encoded by the HIV genome is to:
A. reverse transcribe its RNA genome to DNA. B. ensure that HIV gene transcripts containing introns are transported to the cytoplasm. C. integrate the HIV genome into the host genome. D. None of the above is correct.
In mammals, one region has become especially important as a "relay center" for information passing from sensory structures to the cerebrum. What region is this?
A. pons B. cerebellum C. hypothalamus D. thalamus E. hippocampus
Considering two species of birds, which of the
following is a derived character?
a. four limbs b. a bony skeleton c. egg production d. feathers e. two eyes