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Which of the following structures encloses the cytoplasm?

A.

Plasma membrane

B.

Golgi apparatus

C.

Endoplasmic reticulum

D.

Flagellum

Answer and Explanation

The Correct Answer is A

A. The plasma membrane, also known as the cell membrane, surrounds the entire cell and separates the cytoplasm from the external environment. It acts as a barrier, controlling the movement of substances into and out of the cell. 

B. The Golgi apparatus is involved in modifying, sorting, and packaging proteins and lipids, but it does not enclose the cytoplasm. It is an internal organelle. 

C. The endoplasmic reticulum (ER) is involved in protein and lipid synthesis and forms a network within the cytoplasm, but it does not enclose it. It works within the cell's internal structure. 

D. The flagellum is a tail-like structure used for cell movement in some cells, but it does not enclose the cytoplasm.


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Related Questions

Correct Answer is D

Explanation

A. Expiratory reserve volume is the amount of air that can be exhaled forcefully after normal expiration. It does not refer to the air moved in and out during the normal respiratory cycle.

B. Residual volume is the amount of air remaining in the lungs after a forced exhalation. It cannot be exhaled and is not part of the normal respiratory cycle.

C. Vital capacity is the maximum amount of air that can be exhaled after a maximum inhalation, which includes tidal volume, expiratory reserve volume, and inspiratory reserve volume. It does not specifically refer to the air moved in and out during normal breathing.

D. Tidal volume refers to the amount of air that is moved into and out of the lungs during a normal, relaxed breath. It is the term that directly describes the air exchanged during the normal respiratory cycle.

Correct Answer is A

Explanation

A. The larynx, also known as the voice box, contains the vocal cords. The vocal cords vibrate to produce sound when air passes through them, allowing for speech and other vocalizations.
B. The pharynx is the passageway that connects the mouth and nose to the larynx and esophagus. It does not contain the vocal cords.
C. The trachea is the windpipe that conducts air to and from the lungs. It does not contain the vocal cords but is located just below the larynx.
D. The epiglottis is a flap of tissue that covers the opening of the larynx during swallowing to prevent food from entering the airway. It does not contain the vocal cords

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