Question

question 19 1 pts the hydrogen isotope tritium consists of: one proton. one proton and one neutron. two protons and one neutron. one proton and two neutrons. question 20 1 pts the process of the digestion of food is an example of which type of reaction? synthesis decomposition exchange reversible question 21 1 pts the study of metabolism includes examination of: catabolism. anabolism. atp requirements. all of the above.

Explanation:

• Question 19: Isotopes have same protons but different neutrons. Tritium, an isotope of hydrogen, has atomic number 1 (1 proton) and mass - number 3. So it has 1 proton and 2 neutrons.
• Question 20: Digestion breaks down large food molecules into smaller ones, which is a decomposition reaction.
• Question 21: Metabolism includes catabolism (breaking - down reactions), anabolism (building - up reactions), and energy (ATP) requirements.

Answer:

Question 19: one proton and two neutrons.
Question 20: Decomposition
Question 21: all of the above.