3. A researcher did an experiment to test the activity of pepsin, an enzyme 2 points that digests protein in the stomach, and trypsin, and enzyme that digests
protein in the intestine, at various temperature and pH levels. Figure 1
shows the relative rates of pepsin and trypsin activities at various pH
levels. Pepsin is an enzyme present in the stomach, where the pH is usually
3.0. Which of the following best describes the activity of pepsin when it is
introduced into the intestine, which has a pH around 6.0?*

Which mechanism of transport takes place when solute particles move from a region of high concentration to a region of low concentration? active diffusion isotonic osmosis

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.