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1. Choose the incorrect pair.
A . Best material to study cell \( - RBC\) of human membrane structure
B . Arrangement of lipids in cell - Bilayer membrane
C . Abundant lipid in cell--- Phospholipid membrane
D . Cell membrane composition--- Carbohydrates + Lipids
Solution:
Correct Answer : D
2. Lipids are arranged within the membrane with
A . polar heads towards innerside and the hydrophobic tails towards outerside
B . Both heads and tails towards outerside
C . Heads towards outerside and tails towards inside
D . Both heads and tails towards innerside
Solution:
Correct Answer : C
3. Why tails of lipids in the membrane are towards inner part?
A . The tail is non-polar hydrocarbon and so, protected with an aqueous environment
B . The tail is polar hydrocarbon and so, is protected from aqueous environment
C . The non-polar or hydrophobic hydrocarbon tails of lipid, being on innerside ensure their protection from aqueous environment
D . The tail is hydrophilic so, it tends to be located in the aqueous innerside of membrane
Solution:
Correct Answer : C
4. The lipid component of cell membrane consists of
A . lipolipids
B . phospholipids
C . hydrophobic lipids
D . None of these
Solution:
Correct Answer : B
5. What is the role of sterol in cell membrane?
A . Stability
B . Communication with other cells
C . Secretion
D . Transport
Solution:
Correct Answer : A
6. Identify the component labelled as (A) in the given diagram of cell membrane?
A . External protein
B . Integral protein
C . Sugar
D . Lipid
Solution:
Correct Answer : C
7. According to Singer and Nicolson concept, cell membrane is
A . solid
B . quasifluid
C . fluid
D . solidified sheath
Solution:
Correct Answer : B
8. The fluid mosaic model explains
A . Only structural aspects of cell membrane
B . Only functional aspects of cell membrane
C . Both structural and functional aspects of cell membrane
D . Only fluidity of membrane
Solution:
Correct Answer : C
9. Fluid nature of membrane is able to explain
A . cell growth, cell division
B . formation of intercellular junctions
C . secretion and permeation of various substances across
D . All of the above
Solution:
Correct Answer : D
10. Cell membrane is selectively permeable. This means that it
A . allows all materials to pass through
B . allows only water to pass through
C . allows only certain materials to pass through
D . allows only ions to pass through
Solution:
Correct Answer : C
11. The main difference between active and passive transport across cell membrane is
A . passive transport is non-selective whereas active transport is selective
B . passive transport requires a concentration gradient across a biological membrane whereas active transport requires energy to move solutes
C . passive transport is confined to an ionic carrier proteins whereas active transport is confined to cationic channel proteins
D . active transport occurs more rapidly than passive transport
Solution:
Correct Answer : B
12. One of the major components of cell wall of most fungi is
A . peptidoglycan
B . cellulose
C . hemicellulose
D . chitin
Solution:
Correct Answer : D
13. The cell wall of plant cells
A . provides protection
B . helps in cell to cell interaction
C . provides a barrier to undesirable macromolecules
D . All of the above
Solution:
Correct Answer : A
14. The cell wall and middle lamellae are transversed by
A . plasmodesmata
B . primary wall
C . cytoplasm
D . cortex
Solution:
Correct Answer : A
15. Ribosomes are
I. Non-membrane bound.
II. Absent in plastids and mitochondria.
III. Present in the cytoplasm and RER.
IV. Take part in protein synthesis.
Which of the following option is most appropriate?
A . Only II is correct
B . I and II are correct
C . I, II, III and IV are correct
D . I, III and IV are correct
Solution:
Correct Answer : D
16. Choose the incorrect statement regarding cell membrane.
A . Generally smaller molecules pass easily without energy requirement by passive transport
B . Water soluble substances pass through it less rapidly than lipid soluble substances
C . Neutral solutes move across it by simple diffusion
D . None of the above
Solution:
Correct Answer : D
17. Which one is incorrect about osmosis?
A . It is a specific form of diffusion
B . It refers to the movement of water along its concentration gradient
C . It is a passive movement of water
D . It occurs through a carrier protein and needs ATP
Solution:
Correct Answer : D
18. Which of the following is the correct statement for middle lamella of eukaryotic cell?
A . It is formed as a cell plate during cytokinesis
B . It mainly consists of Ca-pectate
C . It holds different neighbouring cells together
D . All of the above
Solution:
Correct Answer : D
19. Select the right option, which relates to Schwann regarding the following statements.
I. He reported that cells have a thin outer layer, which is today known as plasma membrane.
II. Cell wall is a unique character of the plant cell only.
III. Body of plants and animals are composed of cells and product of cells.
Choose the correct option from below.
A . All are incorrect
B . Only III is correct
C . All are correct
D . II and III are correct
Solution:
Correct Answer : C
20. Choose the correct statements from the codes given below.
I. Schleiden studies were based on different kinds of plant cells and tissues.
II. An incomplete cell structure does not ensure independent living.
III. Cells of plant tissues are often connected with one another through cytoplasmic bridges called plasmodesmata.
IV. Human check cells do not possess a cell wall.
Codes
A . II and III
B . I and II
C . I, III and IV
D . I, II, III and IV
Solution:
Correct Answer : D
Biology Faculty
BDS from PT. B.D. Sharma University of Health Sciences, Rohtak
