Oxygen and carbon dioxide are transported across the plasma membrane by
osmosis
secondary active transport
simple diffusion
channel mediated facilitated diffusion
The Correct Answer is C
A. Osmosis: Osmosis specifically refers to the movement of water across a selectively permeable membrane, not gases like oxygen or carbon dioxide.
B. Secondary active transport: Secondary active transport uses energy indirectly from an ion gradient to move molecules against their concentration gradient. Oxygen and carbon dioxide move passively.
C. Simple diffusion: Oxygen and carbon dioxide are small, nonpolar molecules that can freely cross the lipid bilayer of the plasma membrane. They move down their concentration gradients without the need for energy or transport proteins.
D. Channel-mediated facilitated diffusion: This process requires specific protein channels to transport polar or charged molecules. Since oxygen and carbon dioxide are nonpolar, they do not require channels to diffuse across the membrane.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Cells: The study of cells specifically is called cytology, not histology. Cytology focuses on the structure, function, and life cycle of individual cells.
B. Cell chemistry: The chemical processes within cells are studied in biochemistry, which examines molecular interactions and metabolic pathways rather than tissue organization.
C. The gross structures of the body: Gross anatomy deals with structures visible to the naked eye, such as organs and organ systems, rather than microscopic structures.
D. Tissues: Histology is the study of tissues, which are groups of similar cells working together to perform specific functions. It examines the microscopic structure and organization of these tissues in the body.
Correct Answer is A
Explanation
A. Enzyme's active site: The active site of an enzyme has a specific shape and chemical environment that matches the substrate, allowing the enzyme to bind only particular molecules and catalyze a specific chemical reaction efficiently.
B. Product: The product is the result of the reaction, not what determines the enzyme’s specificity. The enzyme’s structure dictates which substrate it can bind.
C. Enzyme-substrate complex: The enzyme-substrate complex forms after the substrate binds to the enzyme’s active site; it is a step in the reaction, not the determinant of specificity.
D. None of the above are correct, because enzymes are not specific: Enzymes are highly specific, with each enzyme typically catalyzing only one type of chemical reaction.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.