ATI RN
Cells and Tissue Multiple Choice Questions Questions
Question 1 of 5
Of the following nitrogenous bases, only one is found exclusively in RNA:
Correct Answer: D
Rationale: Uracil is unique to RNA, replacing thymine (found in DNA); guanine and adenine are in both.
Question 2 of 5
In the DNA molecule, the nitrogenous base adenine always pairs with:
Correct Answer: B
Rationale: Adenine pairs with thymine in DNA via two hydrogen bonds.
Question 3 of 5
Goblet cells are a type of:
Correct Answer: C
Rationale: Goblet cells are single cells within epithelia that secrete mucus (unicellular glands).
Question 4 of 5
Intervertebral discs are composed of:
Correct Answer: D
Rationale: Intervertebral discs are fibrocartilage, providing strength and flexibility.
Question 5 of 5
What is the main function of proteins in the plasma membrane?
Correct Answer: D
Rationale: Membrane proteins primarily facilitate transport of substances across the membrane.