The Fluid Mosaic Model of the cell membrane was proposed by which scientists? MCQ with Answer and Explanation

The Fluid Mosaic Model of the cell membrane was proposed by which scientists?
A. Robertson and Danielli
B. Watson and Crick
C. Schleiden and Schwann
D. Singer and Nicolson
Answer: Option D
Solution (By JKSSB Mock Tests)
The Fluid Mosaic Model of the plasma membrane was proposed by S. Jonathan Singer and Garth Nicolson in 1972. It describes the cell membrane as a dynamic, fluid structure composed of a phospholipid bilayer with globular proteins embedded or attached, moving laterally within the lipid matrix.

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Question #1
The green pigment that traps light energy in plants is located in the:
A. Cell wall
B. Thylakoid membranes of chloroplasts
C. Nucleus
D. Cytoplasm

Correct Answer: Option B


Explanation:
Chlorophyll, the primary photosynthetic pigment, is embedded in the thylakoid membranes within chloroplasts. These membranes contain photosystems I and II, where light-dependent reactions occur. The stroma of the chloroplast houses the Calvin cycle enzymes. Chlorophyll absorbs mainly blue and red light, reflecting green, giving leaves their color.

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Question #2
Consider statements about human skeleton: 1. The human skull has 22 bones. 2. The femur is the longest bone. 3. Ribs are attached to the sternum directly or indirectly. Which are correct?
A. 1 and 2 only
B. 1, 2 and 3
C. 1 and 3 only
D. 2 and 3 only

Correct Answer: Option B


Explanation:
The human skull consists of 22 bones (8 cranial and 14 facial). The femur (thigh bone) is the longest and strongest bone in the human body. Humans have 12 pairs of ribs; the first 7 are true ribs (direct attachment), next 3 are false ribs (indirect), and last 2 are floating. All statements are anatomically correct.

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Question #3
Which of the following is a defining characteristic of all Chordates?
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Correct Answer: Option C


Explanation:
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