If the chemical enzyme pepsin was mixed with some proteins in a test tube in a laboratory, which of these outcomes would you predict? a)pepsin would probably not break down proteins in the test tube because enzymes cannot exist outside of the human body. b)pepsin would partially break down the protein molecules but would not work well due to the absence of dna in the test tube. c)pepsin would probably not break down proteins in the test tube because pepsin is designed to work at very acidic ph ranges. d)pepsin would break down the protein molecules equally well in the laboratory as in the human stomach since it is a stable chemical.

Refer to this portion of a dichotomous key for fish identification to answer the question. 1. (a) has a single dorsal fin ® 5 (b) has a double dorsal fin ® 2 2. (a) one fin is spiny, the other is smooth ® 3 (b) one fin is not spiny or smooth ® 4 5. (a) has small fin on back near tail ® 6 (b) has no fin on back near tail ® 7 6. (a) has barbs near the mouth ® catfish (b) does not have barbs near the mouth ® 10 7. (a) tail is asymmetrical ® 8 (b) tail is symmetrical ® 9 10. (a) scales are small ® trout (b) scales are large ® whitefish what is the next step to complete to identify a fish that has a single dorsal fin, no fin on the back near the tail, and no barbs near the mouth? step 2 step 5 step 7 step 10