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.
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Related Questions
Correct Answer is C
Explanation
a. Outermost layer that lies underneath the pericardial sac: This describes the epicardium, not the endocardium.
b. Outer layer that produces serous fluid: This describes the pericardium, particularly the visceral layer.
c. Inner layer that is continuous with the blood vessels: The endocardium is the innermost layer of the heart, lining the heart chambers and continuous with the endothelium of blood vessels.
d. Central layer that contracts and relaxes: This describes the myocardium, the muscular middle layer of the heart
Correct Answer is A
Explanation
a. Sebaceous: Sebaceous glands are located near hair follicles and produce sebum, an oily substance that lubricates the hair and skin, preventing dryness and keeping it supple.
b. Eccrine: Eccrine glands are sweat glands located throughout the skin and help regulate body temperature through sweating.
c. Ceruminous: Ceruminous glands are located in the ear canal and produce cerumen (earwax) which protects the inner ear from dust, debris, and insects.
d. Apocrine: Apocrine glands are sweat glands located in areas like the armpits and groin. They produce a thicker sweat that takes on an odor when broken down by bacteria.
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