ATI RN
Cells Tissues and Organs Comprehension Questions Questions
Question 1 of 5
Which of the following central nervous system cells regulate ions, regulate the uptake and/or breakdown of some neurotransmitters, and contribute to the formation of the blood-brain barrier?
Correct Answer: D
Rationale: Astrocytes regulate ions, neurotransmitter levels, and help form the blood-brain barrier in the CNS.
Question 2 of 5
Atoms of the same atomic number but of different mass numbers (different numbers of nuclear particles) are referred to as:
Correct Answer: B
Rationale: Isotopes have the same proton number but different neutron numbers, thus different mass numbers.
Question 3 of 5
The plasma membrane is a sandwich of:
Correct Answer: D
Rationale: The plasma membrane is a phospholipid bilayer with proteins embedded (protein-lipid-protein model).
Question 4 of 5
The sequence of amino acids in protein molecules is determined by the sequence of:
Correct Answer: C
Rationale: mRNA's nucleotide sequence (codons) dictates the amino acid order in proteins.
Question 5 of 5
The inability to absorb digested nutrients may be due to damage of which type of epithelia?
Correct Answer: B
Rationale: Simple columnar epithelium in the gut absorbs nutrients; damage impairs this function.