Scientists label a nitrogen atom in an excess amino acid in a person's blood and follow where the nitrogen atom goes.
Which prediction is most likely?
It becomes part of urea in the liver and is carried in the blood plasma to the kidneys, which remove it in urine.
It stays part of the amino acid, which is carried in the blood plasma to the bladder and removed in urine.
It stays part of the amino acid, which is carried in the blood plasma to the kidneys and removed in urine.
It becomes part of urea in the liver and is carried in the blood plasma to the bladder, which removes it in urine.
94 exam-style questions on Edexcel GCSE Biology 7.4 Blood glucose and the urinary system, covering 7.4.1 Insulin and blood glucose control, 7.4.2 Glucagon and blood glucose regulation, 7.4.3 Type 1 and type 2 diabetes, 7.4.4 Structure of the urinary system, 7.4.5 Structure and function of the nephron, 7.4.6 ADH and water regulation, 7.4.7 Treatments for kidney failure, and 7.4.8 Production of urea in the liver. Each one has a worked solution and a mark scheme showing where the marks go.