Under most biological conditions, however, histidine is considered to be a triprotic acid. This is due to the pKa of the being .A. nitrogen in the imidazole ring possessing a hydrogen but no charge; much lower than the pH values normally found in a cellB. nitrogen in the imidazole ring possessing a hydrogen but no charge; much higher than the pH values normally found in a cellC. carboxylic acid; much lower than the pH values normally found in a cellD. carboxylic acid; much higher than the pH values normally found in a cell

Match each organ or function with its body system. produces urine large intestine ureters mouth filters blood absorbs nutrients from food

Turtle hatchling survivorship rate is low in many turtle species due to predation. amanda researched the predatory rate on a species of turtle eggs in the red river. the eggs were harvested from trapped turtles and the egg's cloaca film (reproductive discharge) was either washed off or left on once gathered. research suggests that predators use the female's cloaca scent to locate the eggs. the eggs were only handled when wearing gloves and then reburied along islands where the turtles were trapped. the nests were monitored by cameras and manually on foot and data on nest predation were recorded. a. based on the experimental design, what is the dependent variable? b. based on the experimental design, what is the independent variable? c. based on the experimental design, what is the control?

Amylase is an enzyme found in the human digestive system. why do you think it was important to keep the enzyme temperature above 37 degrees celsius (98.6 degrees f)? describe what might happen if the temperature decreased by 10 degrees celsius.