ATI RN
Cells and Tissues Multiple Choice Questions Questions
Question 1 of 5
An atom of nitrogen has 7 protons and 7 neutrons. What is the atomic number of nitrogen?
Correct Answer: A
Rationale: Atomic number = number of protons = 7 for nitrogen.
Question 2 of 5
As pH increases, the concentration of ions
Correct Answer: A
Rationale: Higher pH means lower H+ concentration (inverse logarithmic relationship).
Question 3 of 5
The macromolecule that has functions that include formation of the majority of membranes, hormones and a primary long-term energy storage molecule is:
Correct Answer: B
Rationale: Lipids form membranes (phospholipids), hormones (steroids), and store energy (fats).
Question 4 of 5
The building blocks of proteins are
Correct Answer: B
Rationale: Amino acids are the monomers linked to form proteins.
Question 5 of 5
In DNA, adenine is always paired with
Correct Answer: B
Rationale: Adenine pairs with thymine in DNA via two hydrogen bonds.