Question

question 1 (3 points)
amino acids, the building blocks of proteins, are made up of all the same elements with the exception of their r group (side chain).
true
false
question 2 (3 points)
carbohydrates are made up of 3 atoms, carbon, oxygen and potassium.
true
false
question 3 (3 points)
lipids are more calories per molecule than carbohydrates and proteins.
true
false

Explanation:

• Question 1: Amino acids have a common structure with an amino - group, a carboxyl - group, a hydrogen atom, and a variable R - group. The elements in the common part are the same across amino acids, so the statement is true.
• Question 2: Carbohydrates are made up of carbon, hydrogen, and oxygen atoms, not potassium. So the statement is false.
• Question 3: Lipids contain more energy per molecule compared to carbohydrates and proteins because of their high ratio of carbon - hydrogen bonds. So the statement is true.

Answer:

• Question 1: True
• Question 2: False
• Question 3: True