Which of the following is a membrane protein that permits ion passage into or out of a cell?
Vesicle
Enzyme
Channel
Lysosome
The Correct Answer is C
A. A vesicle is involved in the transport of substances within or out of the cell via processes like endocytosis or exocytosis but does not directly permit ion passage across the membrane.
B. An enzyme catalyzes chemical reactions and is not directly involved in the transport of ions across the cell membrane.
C. A channel protein facilitates the passage of ions across the cell membrane, allowing specific ions to move in and out of the cell based on concentration gradients.
D. A lysosome is an organelle responsible for digesting and breaking down waste materials within the cell, not for ion transport across the membrane.
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Related Questions
Correct Answer is D
Explanation
A. Flexion refers to a bending movement that decreases the angle between two body parts, such as bending the knee or elbow, but it does not involve lateral movement away from the body's midline.
B. Adduction is the movement of a body part toward the midline of the body, opposite of what the question describes.
C. Extension refers to a straightening movement that increases the angle between two body parts, such as straightening the arm or leg, but again does not involve lateral movement.
D. Abduction is the correct term for moving a limb or body part away from the midline of the body. In this case, it refers to the lateral movement of the leg away from the body's midline.
Correct Answer is A
Explanation
A. Dense regular connective tissue consists of fibroblasts arranged tightly between parallel arrays of collagen fibers. This structure provides tensile strength in one direction, which is found in tendons and ligaments.
B. Dense irregular connective tissue also contains collagen fibers, but these fibers are arranged in an irregular, non-parallel pattern, allowing the tissue to withstand tension from multiple directions, such as in the dermis of the skin.
C. Elastic connective tissue contains a higher proportion of elastin fibers, which provide stretch and recoil. It is found in structures like the walls of large arteries, but not in parallel arrays of collagen fibers.
D. Reticular connective tissue consists of a network of thin, branching collagen fibers, providing structural support in organs like the spleen and lymph nodes, but it does not have tightly packed fibroblasts between parallel collagen fibers.
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