Which of the following describes a characteristic of the plasma membrane?
The plasma membrane is composed of a bilayer of protein molecules.
The plasma membrane is selectively permeable.
The plasma membrane does not participate in cellular activities
The plasma membrane receptors are specialized lipids.
The Correct Answer is B
a. The plasma membrane is composed of a bilayer of protein molecules: This is incorrect. The plasma membrane is primarily composed of a bilayer of phospholipids, with proteins interspersed within this bilayer.
b. The plasma membrane is selectively permeable: This is correct. The plasma membrane regulates the entry and exit of substances, allowing certain molecules to pass while restricting others.
c. The plasma membrane does not participate in cellular activities: This is incorrect. The plasma membrane is actively involved in various cellular activities, including signaling, transport, and maintaining homeostasis.
d. The plasma membrane receptors are specialized lipids: This is incorrect. Receptors on the plasma membrane are typically proteins, not lipids, which are involved in signal transduction and cellular communication.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
a. Left phrenic artery: The left phrenic artery arises from the abdominal aorta, not the ascending aorta. It supplies blood to the diaphragm.
b. Left coronary artery: The ascending aorta is the first section of the aorta, the major artery leaving the heart. It branches out to give rise to several arteries, including the left coronary artery, which supplies blood to the left side of the heart muscle.
c. Left subclavian artery: The left subclavian artery arises from the aortic arch, not directly from the ascending aorta. It supplies blood to the left arm and head.
d. Left intercostal artery: The intercostal arteries arise directly from the aorta, not specifically the ascending aorta. They supply blood to the muscles and tissues between the ribs.
Correct Answer is B
Explanation
a: Storage of fat - While the skin does contain adipose tissue (fat), its primary function is not fat storage.
b. Body temperature regulation-The skin plays a crucial role in regulating body temperature through processes such as sweating to cool the body down and constriction of blood vessels to conserve heat.
c: Energy production - The skin is not directly involved in energy production; this is primarily carried out by organs like the liver and muscles.
d: Gas exchange - Gas exchange occurs primarily in the lungs, not the skin.
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